Pwosesè Siyal DigiTech RTA Seri II

Enfòmasyon sou pwodwi

Espesifikasyon

• Modèl: Pwosesè Siyal 18-0121-B
• Dat fabrikasyon: 6/8/99
• Seri: Seri RTA, Seri 834/835, Seri 844, Seri 866
• Kalite ploge: CEE7/7 (Ewòp kontinantal)
• Power Cord Colors: Green/Yellow (Earth), Blue (Neutral), Brown (Live)

ATANSYON
RISK CHÒK ELEKTRIK PA Louvri

ATANSYON: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR

AVÈTISMAN: POU REMINI RISK DIFE OSWA CHÒK ELEKTRIK PA EXPOSE EQUIPEMENT SA A A LAPLWI OU A Imidite.

Senbòl yo montre sou bò gòch yo se senbòl entènasyonalman aksepte ki avèti sou danje potansyèl ak pwodwi elektrik. Flash zèklè a ak Arrowpoint nan yon triyang ekilateral vle di ke gen danjere voltagyo prezan nan inite a. Pwen esklamasyon nan yon triyang ekilateral endike ke li nesesè pou itilizatè a al gade nan manyèl pwopriyetè a.
These symbols warn that there are no user serviceable parts inside the unit. Do not open the unit. Do not attempt to service the unit yourself. Refer all servicing to qualified personnel. Opening the chassis for any reason will void the manufactuer’s warranty. Do not get the unit wet. If liquid is spilled on the unit, shut it off immediately and take it to a dealer for service. Disconnect the unit during storms to prevent damage.

Avètisman sou PLUG ELECTRIC UK
Yon priz kouran moule ki koupe nan kòd la pa an sekirite. Jete ploge prensipal la nan yon etablisman jete apwopriye. PA JANM NAN OKENN SIRKONSTAS OU TA DWE METE YON PRISE KI DOMATYE OSWA KOUPE NAN YON 13. AMP POWER SOCKET. Pa sèvi ak priz kouran an san kouvèti fusible a an plas. Ou ka jwenn kouvèti fuzib ranplasman nan magazen lokal ou a. Fusibles ranplasman yo se 13 amps ak DWE gen ASTA apwouve BS1362.

ENSTRIKSYON SEKIRITE (EWOPEYEN)

AVI FOR CUSTOMERS IF YOUR UNIT IS EQUIPPED WITH A POWER CORD.

AVÈTISMAN: APARÈY SA A DWE TÈ.
Nwayo yo nan plon prensipal la gen koulè an akò ak kòd sa a:

VÈT ak JÒN – Latè BLE – Net MARON – Viv
Kòm koulè nwayo yo nan fil elektrik aparèy sa a ka pa koresponn ak mak ki gen koulè ki idantifye tèminal yo nan ploge ou a, kontinye jan sa a:

• Nwayo ki gen koulè vèt ak jòn dwe konekte ak tèminal la nan ploge ki make ak lèt ​​E, oswa ak senbòl latè a, oswa ki gen koulè vèt, oswa vèt ak jòn.
• Nwayo a ki gen koulè ble dwe konekte ak tèminal ki make N oswa ki gen koulè nwa.
• Nwayo a ki gen koulè mawon dwe konekte ak tèminal ki make L oswa ki gen koulè wouj.
• These units comply with the European “EMC Directive” for emissions and susceptbility

Kòd kouran an fini nan yon ploge CEE7/7 (Ewòp Kontinantal). Se fil vèt/jòn ki konekte dirèkteman nan chasi inite a. Si w bezwen chanje ploge a, epi si w kalifye pou w fè sa, al gade nan tablo ki anba a.

KONDIKTÈ		FIL KOULÈ
		Nòmal	Alt
L	LIVE	MAWON	NWA
N	NÈT	BLE	BLAN
E	TÈ GND	VÈT/JAN	VÈT

AVÈTISMAN: Si tè a bat, sèten kondisyon fay nan inite a oswa nan sistèm nan ki konekte li a ka lakòz plen liy vol.tage ant chasi ak tè tè. Lè sa a, blesi grav oswa lanmò ka lakòz si yo manyen chasi a ak tè tè ansanm.

IENPÒTAN!
POU PWOTEKSYON OU, TANPRI LI SA A:

• DLO AK Imidite: Appliance should not be used near water (e.g. near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swim-ming pool, etc). Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings.
• SOUS POUVWA: Aparèy la ta dwe konekte ak yon ekipman pou pouvwa sèlman nan kalite ki dekri nan enstriksyon yo opere oswa jan yo make sou aparèy la.
• TÈ OR POLARIZASYON: Prekosyon yo ta dwe pran pou ke baz la oswa polarization vle di nan yon aparèy pa bat.
• PWOTEKSYON KÒD ALIVRI: Yo ta dwe achemine kòd kouran elektrik yon fason pou yo pa gen chans pou yo mache sou yo oswa kwense pa atik yo mete sou oswa kont yo, peye yon atansyon patikilye sou kòd nan priz, resipyan konvenyans, ak pwen kote yo sòti nan aparèy la.
• SERVICE: Itilizatè a pa ta dwe eseye fè sèvis aparèy la pi lwen pase sa ki dekri nan enstriksyon yo fonksyone. Tout lòt sèvis yo ta dwe refere bay pèsonèl sèvis kalifye.

RTA SERIES II

ENTWODIKSYON

Yon analizè odyo an tan reyèl (RTA) se yon zouti mezi odyo ki montre grafikman de kalite enfòmasyon:

1. The frequency response of an audio system or device, and
2. The frequency response of the listening environment.

Kalite enfòmasyon sa a trè itil pou egalize yon sistèm PA, jwenn pwen cho fidbak, oubyen "nœuds", nan sitiyasyon ranfòsman, epi aplati repons frekans lòt ekipman odyo.
RTAs that show both the entire audible frequency spectrum (20 Hz to 20 kHz) and its entire dynamic range (loudness from 0 dB to 120 dB) are called spec-trum analyzers. RTAs that show portions of the dynamic range are called “window” RTAs.

SOU DOD RTA A
DOD Electronics RTA Seri II a se yon RTA tip fenèt. Li kouvri spectre frekans odib la (20 Hz a 20 kHz), epi li gen yon mèt nivo senk LED pou chak nan 31 bann frekans odyo li kouvri yo.
Seri RTA II a gen ladan l yon mikwofòn mezi odyo kalibre. Mikwofòn sa a ekipe ak yon kab 40 pye ki pèmèt ou pozisyone mikwofòn nan plizyè kote nan zòn ranfòsman an pandan w ap fè evalyasyon sistèm odyo a. SE SÈLMAN MIKWOFÒN SA A KI DWE BRAKE NAN JACK KI SOU DEVAN PANEL RTA A. Lòt mikwofòn yo ka domaje oswa bay lekti ki pa egzak.
Ou ka modifye sansiblite RTA a lè w sèvi ak kontwòl nivo antre a, epi ou ka elaji oswa retresi fenèt RTA a lè w sèvi ak switch Rezolisyon an. Switch sa a pèmèt ou chwazi seri ekspozisyon LED la an dB pou chak LED. Ou ka chwazi swa yon etap 1 dB pou chak LED (pou yon fenèt 4 dB lajè) oswa yon etap 3 dB pou chak LED (pou yon fenèt 12 dB lajè).

The DOD RTA Series II also has its own internal pink noise generator and level control. Pink noise is defined as an audio signal that contains all frequencies at equal energy levels. For this reason, pink noise sounds a lot like static. Pink noise is useful when setting up P.A. systems and audio systems when you need to see the frequency response of the system.

Sou dèyè inite a gen yon priz mikwo oksilyè pou itilize ak lòt mikwo mezi, ak yon priz sòti pou dèlko bri woz la. Lè bri woz la etenn, priz sa a sèvi kòm yon sòti odyo pou siyal la ka pase nan RTA a epi kontwole pandan yon pèfòmans. Genyen tou yon priz antre ki pèmèt ou analize ekipman nan yon sistèm dirèkteman.

KONTW PL PANEL DEVAN

• Pouvwa switch: Applies power to the RTA.
• Ekspozisyon LED: Each vertical column of LEDs displays the signal level within that frequency band. Each frequency is on a 1/3rd octave ISO centered point from 20 Hz to 20kHz.
• Kontwòl Nivo Antre: This control sets the input level from the calibrated microphone input jack, the line level input jack, or the auxiliary microphone input jack. Use this control to set the response of the display to a useful range.
• Chanje rezolisyon: This push-push switch selects the size of step between LEDs to either 1 dB or 3 dB. This effectively widens or narrows the window that the RTA shows, giving you a wider or narrower view of the incoming sig-nal.
• Pink Noise Switch: This push-push switch turns the pink noise generator on or off. To prevent damage to your audio system, be sure to turn down your audio system’s gain control before turing on the pink noise generator.
• Pink Noise Level Control: This rotary potentiometer sets the output level of the pink noise generator. To prevent damage to your audio system, be sure to set this control to minimum before turning on the pink noise generator.
• Calibrated Microphone Input Jack: This jack supplies power to the calibrat-ed microphone. Plug only the calibrated microphone provided with the RTA into the jack on the front panel of the RTA. Other microphones may be dam-aged or give inaccurate readings.

KONTWÒL PANN DÈYÈ

Auxiliary Microphone Input Jack: A female XLR-type connector intended for use with microphones other than the calibrated microphone provided with theRTA. This jack accepts low impedance microphones.

• Line Input Jack: This is a 1/4-inch phone jack that may be connected to unbalanced line level sources.
• Line Output/Pink Noise Output Jack: A 1/4-inch phone jack that provides connection to unbalanced line level inputs. Engaging the pink noise switch on the front panel causes the pink noise generated by the RTA to be output through this jack. Adjust the level for the pink noise generator with the rotary potentiometer on the front panel of the RTA. Disengaging the pink noise switch on the front panel allows this jack to act as a pass-through to the sig-nal introduced at the line input jack.

APLIKASYON NEST
Men kèk ide enpòtan pou konprann anvan ou itilize RTA a.
RTA a se yon aparèy mezi. Li pa afekte oswa chanje son an. Pou fè chanjman nesesè yo nan repons frekans nan yon sistèm odyo, ou pral bezwen swa yon egalizatè grafik oswa yon egalizatè parametrik. Piske RTA a mezire an ogmantasyon 1/3 oktav, li pi fasil pou itilize yon egalizatè grafik 1/3 oktav nan sistèm nan, tankou 231 Seri II, 431 Seri II, oswa 831 Seri II DOD a.
Yon egalizatè parametrik itil tou. Sepandan, egalizatè parametrik yo pa osi fasil pou itilize tankou egalizatè grafik yo.

Nòt: A lot of “fixing” can be done by simply repositioning the microphones and speakers in a system.
RTA a ap ede w jwenn pwoblèm repons frekans nan sistèm odyo w la, epi, avèk yon egalizatè, korije pwoblèm sa yo. Pou fè son an agreyab, kòmanse apre ou fin korije pwoblèm sistèm yo, epi se yon zòrèy ki gen eksperyans ki pi byen fè sa. Sistèm "plat" yo ap parèt twò byen file oswa twò klere pou moun k ap koute a nan pifò sitiyasyon ranfòsman, kidonk paramèt egalizatè a ap prèske toujou chanje pou fè sistèm nan sonnen pi byen.
When measuring the sound in an enclosed sound reinforcement application, use more than one microphone location. This is because speaker dispersion characteristics vary greatly as you move around the room (particularly with multiple driver systems). If you find that different areas of the room behave differently, try to average the settings on the equalizer to correct the room as a whole.

Ou pa bezwen mete bri woz sou sistèm nan. Sèvi ak nivo RTA a ki jis ase pou simonte nenpòt bri anbyen nan chanm nan (tankou èkondisyone oswa bri trafik). Sansiblite RTA a ta dwe jis ase wo pou lè ou etenn bri woz la, okenn nan LED yo pa limen akoz bri ki nan chanm nan.
Sèvi ak rezolisyon 3 dB a sou frekans ki anba 500 Hz. Repons pik bri woz la lakòz yon derive nan rezolisyon 1 dB a, sa ki fè li difisil pou korije rapidman. Sèvi ak rezolisyon 1 dB a pou mezire frekans ki pi wo pase 500 Hz.

EGALIZE PRENSIPAL ORATÈ YO NAN YON SISTÈM RANFÒSMAN ESTANDA
Premyèman, mete mikwofòn kalibre a 3 a 4 pye devan oratè prensipal yo sou aks oratè a. Sa a patikilyèman enpòtan ak yon sistèm andedan kay la pou ou ka fè premye ajisteman yo nan sistèm nan andedan distans kritik sa a (anvan reverberasyon anviwònman chanm nan gen yon chans afekte repons sistèm nan).
Limen dèlko bri woz la, fè atansyon pou ou pa fè sistèm nan bri twòp. Asire w ou bese son antre sistèm nan, answit ogmante nivo bri woz la nan yon nivo mezi ou ka koute. Sèvi ak egalizatè grafik la, ajiste repons sistèm nan pou l plat otank posib.
Yon fwa ou fin egalize epi korije sistèm nan nan chan ki pre a, deplase mikwofòn kalibre a deyò nan chanm nan, yon distans nòmal pou koute soti nan oratè yo. Pandan w ap deplase mikwofòn nan lwen oratè yo, ou pral remake de bagay:

1. The high frequency response of the system will fall off, usually starting at about 10 kHz.
2. When there are other structures nearby, one or more peaks or dips will appear in the low end.

The high frequency roll off is caused by absorption of high frequencies in the air. Don’t adjust the highs any more by measurement. The highs can be adjusted by ear using program material you’re familiar with. Be sure to check several positions in the room and compromise the equalization/attenuation setting for the best possible sound. This may be done either with the equalizer or by aiming the tweeters of the main speakers differently.

Pik ak bese frekans ki ba yo gen rapò ak chanm nan, epi yo ka korije nan yon sèten mezi. Anvan ou fè nenpòt koreksyon, asire w ou deplase mikwofòn kalibre a nan chanm nan pou w ka fè yon lide sou kijan pik ak bese yo ka depann de pozisyon an. Lè ou konnen ki kote nan chanm nan pik yo ye, nan ki frekans yo rive, ak... amplatitid, ou ka eseye make yo ak egalizatè a.
Finally, play some program material with which you’re familiar and set the sys-tem’s response to your taste.

EGALIZAN STAGMONITÈ E KI ITILIZE RTA A

• Pwosedi sa a se yon fason rapid e fasil pou minimize fidbak nan yon sistèm siveyans, epi pou jwenn pi bon son an nan sistèm ou an.tagmonitè e yo. Mete mikwofòn kalibre a kèk pous sou kote s latage mikwofòn.
• This is so that the stagMikwofòn nan pa antrave mikwofòn kalibre a lè l ap pran son an.tagsiyal monitè e.
• Turn on the pink noise generator, being careful not to blast the monitors. Make sure that you turn down the input to the system, then increase the pink noise level to a convenient measuring level. Use just enough level from the

RTA to overcome any ambient room noise

• Ogmante gen an sou s latagmikwofòn yo jiskaske yo kòmanse bay fidbak. Ou ap wè frekans fidbak la parèt nan fenèt RTA a.
• Si w ap itilize plis pase yon sèl stage monitor, find the one that feeds back the worst and use that monitor to find the feedback nodes. Notch out the offend-ing frequency with your equalizer. Increase the gain on the stage micro-phones until you observe another feedback node. Notch out this frequency.
• Ou ka eseye jwenn epi retire lòt frekans, men apre twazyèm frekans lan, sa ap vin pa pwodiktif. Ou ap wè ke lè w fè gwo fant pou diminye fidbak la, kalite son sistèm monitè a ap diminye.
• Sèvi ak bri woz, eseye aplati repons monitè yo. Si w ap eseye reyalize pi wo nivo son posib anvan fidbak ki soti nan s latagAvèk monitè yo, kalite son sistèm monitè a ap redwi. Pi bon son ki soti nan monitè yo anjeneral jwenn avèk yon "paramèt konpwomi" sou egalizatè a. Objektif kalite paramèt sa a se pou diminye yon ti kras nœuds fidbak yo, men toujou pèmèt yon bon kalite son ki soti nan monitè yo.

Another method for equalizing a monitor system uses the stage microphones without the RTA’s calibrated microphone. Most reinforcement type microphones are not flat in their frequency response. This procedure, however, takes the stage microphone’s response into account as you equalize the system.

• Use the system’s own microphones to sampkite chan son an sou stage using the pink noise generator signal. Have someone stand in front of the microphone or place their hand in front of the microphone so that you can see what effect it may have on the system’s feedback and overall sound.
• This is the best way to minimize feedback and get the highest sound level from the monitors, but you will sacrifice some sound quality.
• Once you’ve equalized the system with one of the above procedures, the following setup will help you find the howls and ringing that inevitably occur as you use the system (this procedure can be used for both monitors and mains).
• Use a mono or auxiliary output or loop through the RTA to your speakers.
• Adjust the level input to the RTA so that the “+” LEDs flash on signal peaks. Set the resolution of the RTA to the 3 dB range.
• After feedback occurs, watch the RTA. The last frequency band to decay is where the feedback is occurring. This frequency may then be notched out using the equalizer.

Spesifikasyon

• Number of Frequency Bands: 31.
• Display Range: 1 dB step per LED, or 3 dB step per LED.
• Level Range: 53 dB to 107 dB SPL.
• Display Attack Time: Peak, Instantaneous.
• Frequency Accuracy: ±4%.
• Pink Noise: Pseudo-random, digital synthesized.
• Pink Noise Level: -26 dBu to -7 dBu.
• Calibrated Microphone: Omni-directional, back-electret condenser-type, RTA powered.
• Microphone Sensitivity: -64 dB, ±3 dB (0dB =1V/μbar @ 1kHz).
• Microphone Frequency Response: 20 Hz to 20 kHz, ±1 dB.
• Auxiliary Microphone Input: XLR-type connector, balanced.
• Auxiliary Microphone Impedance: 4 kohms.
• Auxiliary Microphone Maximum Gain: 104 dB.
• Auxiliary Microphone Minimum Signal: -95 dBu.
• Line Level Input: 1/4-inch phone jack, unbalanced.
• Line Level Input Impedance: 30 kohms.
• Line Level Maximum Gain: 40 dB.
• Line Level Minimum Signal: -30 dBu.

834/835 SERIES 11

ENTWODIKSYON
DOD 834 Seri II a se yon kwazman stereo 3-vwa, mono 4-vwa, epi 835 Seri II a se yon kwazman stereo 2-vwa, mono 3-vwa. Rezo kwazman kalite siperyè sa yo fèt pou ekstrè maksimòm kalite son nan milti-ampSistèm son a yon pri mizisyen k ap travay yo kapab peye.
Filtè Butterworth egzak ki varyab nan eta a, 18 dB/oktav, anpeche pik oswa bese nan pwodiksyon an nan pwen kwazman yo, sa ki asire bon pwoteksyon chofè a lè yo diminye frekans kwazman yo rapidman.
Ou ka mete yon filtè de pòl, ki pase wo, elektwonikman nan 40 Hz lè l sèvi avèk yon switch sou panèl devan an (834 sèlman), epi yon pwodiksyon varyab ki gen ba frekans disponib pou aplikasyon subwoofer mono.
Panèl dèyè 834/835 la make byen klè pou operasyon stereo ak mono, epi tout pwodiksyon sou 834 la eksepte pwodiksyon mono Low Frequency Sum la gen ladan yo switch faz.

ADVANTAGES NAN YON MILTIP AMPSISTÈM LIFIER
milti-ampSistèm ed yo itilize separeman amplifikè pou chak bann frekans, sa ki pèmèt chak amplifter pou bay maksimòm efikasite nan yon seri espesifik. Metòd sa a ampLifikasyon an bay yon son jeneral ki pi pwòp epi yon diminisyon siyifikatif nan kantite pouvwa ki nesesè pou kondwi sistèm nan nan menm nivo ak yon gwo ranj. ampsistèm amelyore ak plis pouvwa.
Pi gwo demann pouvwa nan yon sistèm son soti nan frekans ki ba nan materyèl pwogram nan. Sa a se paske siyal mizik ak vwa yo genyen sitou enfòmasyon ki ba frekans, epi chofè ki ba frekans yo jeneralman mwens efikas pase transducteur ki wo frekans yo.
Nan yon milti-ampsistèm ed, pouvwa a ampLimifikatè (yo) pou frekans ki ba yo ka ase gwo pou jere pi gwo demand pouvwa, sa ki pèmèt pouvwa frekans ki wo amplimifikatè yo pi piti, men ase pou jere demand kontni frekans segondè materyèl pwogram nan. Piske chak eleman nan sistèm nan mache ak pwòp eleman li yo amplifier, nenpòt distòsyon ki rive limite a frekans pouvwa overdriving la amplifikè. Rès siyal la rete klè e san defòmasyon.

Epitou, piske pri a pi ba, pi piti ampLifyè yo ka fè travay pi gwo yo epi pi chè yo ampLifters ki nesesè pou kondwi tout vitès ampsistèm ed yo, pri yon sistèm son ka redwi anpil (epi son an ka pi bon pandan pwosesis la). Li ka pi fasil tou pou transpòte plizyè pi piti pouvwa ampplizyè kalite ekipman toupatou, olye de yon sèl gwo, sa ki fè sistèm pòtab yo pi fasil pou manyen.

ENSTALASYON

Enstale kwazman an nan yon etajè avèk vis etajè yo bay yo. Chemen kòd kouran AC a lwen liy odyo yo epi ploge l nan yon priz ki pratik. Konekte liy odyo yo nan kwazman an lè l sèvi avèk priz antre ki apwopriye yo nan chanèl 1 ak 2 (pou operasyon stereo), oubyen nan chanèl 1 sèlman (pou operasyon mono). Konekte priz sòti ki apwopriye yo pou operasyon stereo 3-fason, operasyon mono 4-fason (834 sèlman), oubyen stereo 2-fason, mono 3-fason (835). Panèl dèyè a make byen klè pou koneksyon kòrèk la. Swiv etikèt ki anlè yo pou koneksyon stereo oubyen etikèt ki anba yo pou koneksyon mono.
All inputs and outputs are balanced. Use XLR type male plugs for inputs and female plugs for outputs. For balanced operation using 1/4″ phone plug con-nectors, use only tip-ring-sleeve (stereo) jacks. For unbalanced operation using 1/4″ phone plug connectors, use only tip-sleeve (mono) jacks.

FOR BALANCED CONNECTION:
Wire XLR connections as follows:

• Pin 2: high
• Pin 3: low
• Pin 1: ground or common

Wire 1/4″ tip-ring-sleeve phone plug connectors as follows:

• Tip: high
• Ring: low
• Manch: tè

POU DEZEKILIBRE AMPKONEKSYON LIFIER:
Pou fè yon koneksyon dezekilib ak konektè XLR inite a, konekte konektè liy yo jan sa a:

• PIN 2: wo
• PIN 3: NO CONNECTION
• PIN 1: ground

Sèvi ak konektè ploge telefòn 1/4″ ak manch pwent pou koneksyon ak amplifi, branche jan sa a:

• konsèy: segondè
• sleeve: tè

Nòt: The 834 1/4″ jacks may be connected balanced or unbalanced and that the 835 has both balanced and unbalanced outputs. Input impedance is 40K ohms, and output impedance is 102 ohms.
Yon fwa ou fin enstale, ajiste epi teste kwazman an, ou ka tache yon panèl sekirite opsyonèl sou panèl devan inite a pou anpeche li.ampering.

SETUP

Consult your speaker and driver manufacturer’s specifications for the recom-mended crossover frequencies. Basic setup procedures for the crossovers are as follows:

• Label each power amplifikatè pou bann frekans respektif li an.
  • 834: LOW, MID, or HIGH for stereo operation; LOW, LOW-MID, HIGH- MID, or HIGH for mono operation.
  • 835: LOW, HIGH for stereo operation or LOW, MID, HIGH for mono operation.
• Set each power ampkontwòl volim lifter la nan maksimòm epi konekte chak pouvwa amppwodiksyon lifter la nan oratè oswa chofè ki kòrèk la. PA LWIN KOURAN AN AMPLAVI YET.
• Apply power to the crossover.

OPERASYON STEREO
Sèvi ak mak ki nan ranje anwo panèl devan ak dèyè yo, mete chak chanèl jan sa a:

• Mete the gain control to 0 dB. Set all level controls to -∞ and switch in the 40 Hz high-pass filter if desired (834 only).
• 834 Set the LOW/MID crossover frequency for each channel according to the front panel markings.
• 835 Set the LOW/HIGH crossover frequency for each channel according to the front panel markings.
• 836 If the desired frequency is above 500 Hz, the Range switch must be engaged (LED indicator lit). If the desired frequency is below 500 Hz, the Range switch must be disengaged (LED indicator off).

Lè switch ranje a aktive, frekans ki make otou kontwòl frekans LOW/MID (LOW/HIGH pou 835) la miltipliye pa dis. Nan lòt mo, si frekans LOW/MID (LOW/HIGH pou 835) la fikse sou 250 epi switch ranje a aktive, frekans kwazman reyèl la se 2.5 kHz.

834: Set the MID/HIGH crossover frequency. The Channel 1 MID/HIGH frequency control has two sets of markings. When using the crossover in stereo mode, use the lower frequency markings to set the MID/HIGH crossover point. This frequency control has no range switch, and in stereo mode extends to 7.5 kHz.

835: Set the LOW/HIGH crossover frequency. This frequency can be varied from 100 Hz to 10 kHz.

• Connect the outputs of the crossover to the appropriate amplavi. POUVWA A AMPLIFIERS SHOULD STILL BE UNPOWERED. Check to see that all crossover level controls are set to -∞, and that both gain controls are set to 0 dB. Apply power to the low frequency amplifier.
• Send a broadband signal into the crossover and slowly bring up the LOW level control. Set the control for the desired level. The gain control can be used to boost the signal if needed.

834: Apply power to the mid frequency amplifier la epi ogmante kontwòl nivo MID la nan nivo ou vle a.
834/835: Finally, apply power to the high frequency power amplifyè a epi monte kontwòl nivo HIGH la nan nivo ou vle a.

Once the output levels are set, any phase problems can be corrected with the phase inversion switches on the rear panel (834 only). THE PHASE INVER-SION SWITCHES ON THE 834 ARE MECHANICAL SWITCHES AND SHOULD ONLY BE CHANGED WHEN THE POWER AMPLIFIER POU SOTI SA A ETEIN. Bese kontwòl nivo yo sou 834 la p ap anpeche tranzisyon parèt nan sòti yo lè w ap chanje switch faz yo pandan kwazman an aktive. Tranzisyon sa yo ka domaje pouvwa a. amplifiers, speakers,  and drivers.

OPERASYON STEREO AVÈK YON SUBWOOFER MONO

Mòd operasyon sa a bay:

• 834: Channel 1 and Channel 2 high frequency outputs, Channel 1 and
  Channel 2 mid frequency outputs, and one summed low frequency output.
• 835: Channels 1 and 2 high frequency outputs and one summed low frequency output.

Pwosedi konfigirasyon an se menm jan ak pou mòd stereo a, eksepte ke, olye pou konekte tou de sòti ba frekans yo, konekte sèlman sòti Low Frequency Sum nan ak mòd ba frekans lan. ampMete tou de kontwòl nivo LOW yo sou menm nivo a pou asire ke tou de kontwòl yo kontribye menm kantite siyal nan pwodiksyon Low Frequency Sum lan.

Nòt: that there is no phase inversion switch on the 834 for the Low Frequency Sum output. Any phase problems must be corrected using the phase inversion switches on the other four outputs.

MONO OPERASYON
Depress the Stereo/Mono switch (LED indicator lit). When operating the crossover in stereo mode, the MID/HIGH frequency control of the 834 is vari-able from .75 kHz – 7.5 kHz. When operating the crossover in mono mode, the HIGH-MID/HIGH frequency control range is from 2 kHz – 20 kHz.
Pwosedi konfigirasyon mòd mono a se menm jan ak mòd stereo a, eksepte ke yo pral swiv ranje mak ki anba yo sou panèl devan ak dèyè yo olye de ranje ki anlè a. Asire w ke amplifiers are off, that the gain control is set to 0 dB, and that the level control is set to -∞ before proceeding to adjust the crossover frequencies and levels. The Low Frequency Sum output is not usable in the mono mode.

834 SPECIFICATIONS

• Crossover type: Stereo 3-way, Mono 4-way.
• I/O Connectors: 834: 1/4″ tip-ring-sleeve phone jacks for balanced/unbalanced connections.
• 834 XLR: Inputs: balanced female XLR, Outputs: balanced male XLR.
• THD+Noise: Less than 0.006%.
• Signal-To-Noise Ratio: Greater than -90 dB
• Filter Type: 18 dB/octave Butterworth state-variable filters.
• Crossover Frequencies – Stereo: LOW/MID: 50 Hz to 5 kHz in two ranges,
• MID/HIGH: 750 Hz to 7.5 kHz. – Mono: LOW/LOW-MID: 50 Hz to 5 kHz in two ranges, LOW-MID/HIGH-MID: 50 Hz to 5 kHz in two ranges, HIGH-MID/HIGH: 2 kHz to 20 kHz.
• Input Impedance: 20 k ½ unbalanced, 40 K ½ balanced.
• Maximum Input Level: +21 dBu (ref.: 0.775 Vrms).
• Output Impedance: 102 ½..
• Maximum Output Level: +21 dBu (ref.: 0.775 Vrms).

835 SPECIFICATIONS

• Crossover type: Stereo 2-way, Mono 3-way.
• I/O Connectors: 835: Inputs: 1/4″ tip-ring-sleeve phone jacks for balanced/unbalanced connections. Outputs: 1/4″ tip-ring-sleeve phone jacks for balanced connections and 1/4″ tip-sleeve phone jacks for unbalanced connections.
• 835 XLR: Inputs: balanced female XLR, Outputs: balanced male XLR.
• THD+Noise: Less than 0.006%.
• Signal-To-Noise Ratio: Greater than -90 dB
• Filter Type: 18 dB/octave Butterworth state-variable filters.
• Crossover Frequencies –
• Stereo: LOW/HIGH: 100 Hz to 10 kHz in two ranges. –
• Mono: LOW/MID 100 Hz to 10 kHz in two ranges. MID/HIGH 100 Hz to 10
• kHz in two ranges.
• Input Impedance: 20 k ½ unbalanced, 40 K ½ balanced.
• Maximum Input Level: +21 dBu (ref.: 0.775 Vrms).
• Output Impedance: 102 ½..
• Maximum Output Level: +21 dBu (ref.: 0.775 Vrms).

844 SERIES II

ENTWODIKSYON
The DOD 844 Series II Quad Noise Gate consists of 4 independent noise gates in a single rack space unit. Threshold, release time, and attenuation (0 dB to 90 dB) for each gate are user controllable. Special features include a Key input for gating, or “keying”, from a signal other than the input. A control out-put is also provided for triggering other devices with a 5 volt pulse from the selected channel when the input for that channel rises above the threshold. Monitoring the operation of the 844 is made simple with front panel LEDs that indicate the operating status of each channel (lit when input signal is being gated).

ENSTALASYON
Install the 844 in a rack with the provided rack screws. Route the AC cord away from audio lines to a convenient outlet. Connections to the input and output jacks are made using balanced tip-ring-sleeve or unbalanced 1/4″ tip-sleeve phone plugs.
FOR BALANCED CONNECTION: wire the plug as follows:

• Tip: high.
• Ring: low.
• Sleeve: ground.

POU DEZEKILIBRE CONNECTION: wire the plug as follows:

• Konsèy: segondè.
• Manch: ba

Koneksyon ak antre Key la fèt lè l sèvi avèk yon ploge telefòn mono 1/4″ ki branche pou koneksyon dezekilib jan sa endike pi wo a.
Koneksyon ak pwodiksyon kontwòl la fèt avèk yon ploge mono 1/4″ ki branche pou koneksyon dezekilib tankou nan vèsyon anvan an. Sa a PA yon pwodiksyon odyo.

APLIKASYON
The 844 Series II Quad Noise Gate can be used in a variety of situations. The  most typical use is a standard noise gate. With the Key Source switch set to INT and the Attenuation control set to 90 dB, the unit will attenuate the input signal when its level falls below the threshold level. The release control (fade time) can be set to begin the attenuation very slowly or very quickly as desired.
Prensipal itilizasyon gating lan se pou retire bri lè siyal ou vle a pa prezan. Yon aplikasyon tipik se pou gating lan nan yon twous tanbou ak mikwo. Gateing lan ap elimine bri pedal la anvan ou frape tanbou a. Aplikasyon sa a konekte jan sa a:

• Konekte pre aampKonekte sòti mikwofòn amelyore a nan antre 844 la, epi konekte sòti 844 la ak antre yon mixer.
• Set the Attenuation to 90 dB and set the threshold so that the gate only opens when the drum is struck. Less attenuation may be needed if the effect of the gate is too noticeable.
• Switch the Key Source control to Ext. The detector will now ignore the high frequency signals (in this case, the cymbals), and will allow the drum signal though only when the drum is struck.
• Keying ka itilize pou plis pase jis retire bri. Si yon machin tanbou konekte ak antre Key la, siyal ki nan antre kanal la ap senkronize ak siyal machin tanbou a.

Pou egzanpample, if the signal appearing at the channel input of the gate is a sus-tained guitar chord, the resulting output would be the chord sound “played” to the rhythm of the drum machine. Using this technique can produce some interesting results. Try using different Key sources to trigger the gate. You may find something you like.
The Control output is a unique feature of the 844 Series II. This output can be used to trigger a drum machine or sequencer in time with whatever is input into either the channel input or the Key input, offering a quick means of syn-chronizing other equipment to the input.

SPECIFICATIONS

• Number Of Channels: 4.
• Frequency Response: 10 Hz-30 kHz, ±0.5 dB
• THD+Noise: 0.06%
• Signal-To-Noise Ratio: -97 dB (ref.: 0.775 Vrms)
• Input Impedance: 20 kΩ unbalanced, 40 kΩ balanced
• Maximum Input Level: +21 dBu (ref.: 0.775 Vrms)
• Output Impedance: 102 Ω balanced, 51 Ω unbalanced
• Maksimòm Sòti Nivo: +21 dBu
• Key Input Impedance: 30 kΩ
• Key Input Maximum Level: +21 dBu (ref.: 0.775 Vrms)
• Threshold: Adjustable from -60 dBu to +10 dBu
• Attenuation: Adjustable from 0 dB to 90 dB
• Release Time: Adjustable from 20 msec. to 5 sec.

866 SERIES II GATED

COMPRESSOR/LIMITEUR

ENTWODIKSYON
DOD 866 Seri II a se yon konpresè/limitè stereo ak pòtay ki ka fonksyone kòm de konpresè/limitè endepandan oubyen kòm yon sèl inite stereo. 866 Seri II a enkòpore karakteristik "jenou mou" nan aksyon konpresyon li pou bay yon son natirèl anba kondisyon rediksyon gen. 866 la genyen tou yon pòtay bri pou asire yon operasyon silansye lè pa gen siyal. Tout paramèt operasyon kritik yo reglabl, sa ki pèmèt maksimòm fleksibilite sou yon pakèt aplikasyon. Kèlkeswa jan ou chwazi pou itilize li, 866 la te fèt pou l yon zouti odyo abòdab pou mizisyen, gwoup pèfòmè, ak estidyo anrejistreman ti ak mwayen.

ENSTALASYON
Enstale 866 la nan yon etajè avèk vis etajè yo bay yo. Pase kòd kouran an lwen liy odyo yo epi branche l nan yon priz ki pratik. Konekte liy odyo yo nan priz chanèl A ak B ki apwopriye yo sou konpresè a.
POU YON KONEKSYON EKILIBRE: Sèvi ak ploge telefòn 1/4″ ki gen pwent bag ak manch, branche jan sa a:

• tip: high
• ring: low
• sleeve: ground

POU KONEKSYON DEZEKILYE: sèvi ak swa ploge mono 1/4″ oswa ploge phono RCA, branche jan sa a:

• tip: hot
• sleeve: low

Kontwòl yo ak fonksyon yo se jan sa a:

• Pòt Pòt: The Gate Threshold controls the level at which the 866 will allow the input signal through to the compressor section of the unit. If the signal level is below the threshold, no signal is allowed to pass. The red LED  will light whenever the signal is being gated. To disable the gating action, set the Gate Threshold control to the full counter-clockwise position (the gate control is fully independent of all other controls on the 866).
• Antre Gain: The Input Gain control allows you to adjust the signal level to the compressor. This control directly affects the setting of the Gate Threshold control and the Compressor Threshold control, and is active even when the Compress switch is in the out position. With the Input Gain control set to 0 dB, over 20 dB of headroom is available to the compressor.
• Compressor Threshold: This control sets the level at which the compressor begins to act. The Input Gain control affects the Compressor Threshold set-ting by changing the overall level that the compressor sees. When used in combination with the Input Gain control, the Compressor Threshold control can be adjusted to accommodate a wide range of signal levels.
• Rapò: Determines the amount, or ratio, of compression applied to the incom-ing signal. A ratio of 1:1 means that no compression is applied; a ratio of less than 10:1 is generally considered compression; a ratio of more than 10:1 is generally considered limiting; a ratio of ∞:1 allows no signal above the Compressor Threshold level setting.
• Atak: This control adjusts the speed with which the compressor reacts to an increase in input signal level above the threshold. Shorter attack time set-tings will cause the compressor to react more quickly to transients, giving an added measure of protection to sensitive equipment. Longer attack times allow more of the transient to pass, yielding a more natural sound while still compressing the dynamic range of the signal.
• Lage: The Release control adjusts the speed with which the compressor reacts to a decrease in input signal level above the threshold. Faster release time settings can cause a sudden increase in noise on peaks for some pro-gram material as the compressor lets go. This effects is known as “breath-ing”. Increasing the Release time setting will help minimize breathing.
• Sòti Gain: Determines the output level of the compressor. This is useful when making up for gain lost in the compression process. The output level is active only when the Compress switch is depressed.
  Rediksyon Pwofi: Grafik ba LED sis segman sa a endike kantite rediksyon pwofi konpresè a. Li fonksyone menm lè switch Konpresyon an nan pozisyon deyò pou itilizatè a ka pre-view aksyon 866 la anvan yo mete l nan chemen siyal la.
• Compress: The compress switch activates the compressor when depressed.
• Stereo Link: Depressing the Stereo Link switch links the two compressor channels for stereo operation. In stereo mode, the compressor will react to either channel, while reducing gain in both channels. Both channels of the 866 are identical in control and function EXCEPT when placed in the stereo mode. In stereo mode, the channel 1 controls become the master controls for both channels, while the Input Gain controls remain independent for each channel.

Antre ak sòti panèl dèyè a ansanm ak fonksyon yo se jan sa a:

• Antre: The inputs of the 866 will accept line level signals, either balanced or unbalanced. A 1/4″ tip-ring-sleeve phone jack and an RCA phono jack are pro-vided for each input. Using the 1/4″ input jack disconnects the RCA input jack.
• Sòti: The outputs of the 866 will drive either balanced or unbalanced lines. A 1/4″ tip-ring-sleeve phone jack and an RCA phono jack are provided for each output. Both the 1/4″ phone jacks and the RCA jacks may be used at the same time.
• Antre chèn bò: Allows access to the signal detector circuit of the com-pressor, permitting control of the compressor with another signal for such applications as “ducking”. When used with the Side Chain Output, the original input signal can be modified for applications such as “deessing”. Inserting a plug into this jack opens the internal side chain path so that the detector will only respond to the signal at this jack. In the stereo mode, both channels of the compressor react as one.
• Side Chain Output: The Side Chain Output is the buffered output normally fed to the detector. It is used in conjunction with the Side Chain Input to modify the detector signal for special applications such as “ducking” and “deessing”. For these applications, the Side Chain Output signal is sent to a signal processor and returned through the Side Chain Input.

APLIKASYON
Fleksibilite 866 la pèmèt li fè anpil travay tretman siyal avèk menm fasilite ak klète. Men kèk konsèp nesesè pou konprann anvan ou itilize 866 la.
De nan aplikasyon ki pi komen pou 866 la se konpresyon senp ak limitasyon. Konpresyon ak limitasyon yo fèt menm jan an, ak de diferans enpòtan: nivo papòt konpresè a ak paramèt rapò pou konpresyon yo anjeneral pi ba pase pou limitasyon.

The Compressor Threshold controls the point above which the compressor begins to reduce the gain. For compression, the Compressor Threshold is set low, so that even low level signal will activate the compression. For limiting, the Compressor Threshold is set high so that all of the dynamics of the signal are preserved, but extremely high levels are reduced to protect amplifizè, oratè, oubyen pou anpeche saturation tep. Nan aplikasyon sa a, detektè a inyore chanjman nivo siyal ki anba papòt la.

The 866 features a “soft knee” compression curve for more natural sounding compression. This means that as the signal level approaches the threshold setting, the compressor starts to react. The ratio, or slope, of the gain reduction continues to increase gradually as the signal passes above the threshold until it reaches the final gain slope set by the Ratio control. This feature makes the compressor’s operation less obtursive by easing into full com-pression. As you increase the compression Ratio, the “knee” gets sharper, and the gain reduction increases more rapidly with increased signal. Protective limiting requires a high compression Ratio setting, so that full compression is reached quickly.
The time it takes for the detector to react to an increase in signal level is deter-mined by the Attack control setting. To preserve some of the transient punch of a signal, the Attack time should be set fairly high. This allows the user to compress the overall dynamic range of a signal while still preserving the natural, open feel of the sound. For limiting, the Attack time should be short, so that potentially damaging transients don’t get past the limiting protection of the compressor.

Release time is the opposite of attack time. The Release time setting deter-mines the amount of time the detector takes to react to a decrease in signal level and to release the action of the compression. Faster release times will help preserve the original dynamics of the signal, but may cause a problem in some program material. This effect is called “pumping” or “breathing” . As the compressor lets go of the signal, the level of the signal (and the noise floor) is allowed to rise. When the next transient hits, the signal level is pushed down again according to the Attack time setting. Breathing can be minimized using longer Release times, which smooth out the action of the compressor.
Once a signal has crossed the threshold, the compressor must be told how much to reduce the gain. The Ratio control determines the amount of gain reduction, expressed as a ratio, adjustable from 1:1 (no gain reduction) to ∞:1 (the signal is not allowed to rise above the Threshold level). Compression ratios express the ratio between the input signal level and the desired output level. A compression ratio of 2:1 means that for an increase of 2dB above the threshold input signal, the compressor output will rise only 1 dB. At a ratio of 5:1, an input increase of 5dB above the threshold will yield an output increase of 1 dB, and so forth. The setting of the Ratio control is dependent upon the  application in which the compressor is to be used.

Hiss and signal processor idling noise are common sound reinforcement problems. The more signal processors there are in line with the program material, the more noise is produced at the final output stage. For this rea- son DOD has incorporated a noise gate in the 866. A gate acts like a compressor in reverse. When a signal crosses the gate threshold, it is allowed to pass unaffected. When the signal level falls below the gate threshold level,  the signal gain is attenuated, effectively shutting it off. The Gate Threshold control of the 866 allows the user to adjust the threshold level of the noise gate. When the control is in the fully counter clockwise position, the noise gate is inactive and all signals will pass through.
The Output Gain control allows the user to make up for gain lost in the com-pression process and to set the output level of the compressor for compatibility with other equipment.
Men kèk paramèt konpresè ki ka sèvi kòm yon pwen depa pou aplikasyon nou te kouvri jiska pwen sa a:

Vocal Compression:

• Compressor Threshold: low
• Pwopòsyon: 5:1
• Attack: 10 msec
• Release: 200 msec

Guitar Compression for Extra Sustain:

• Compressor Threshold: low
• Pwopòsyon: 15:1
• Attack: .5 msec
• Release: 500 msec

Protective Limiting:

• Compressor Threshold: high
• Ratio: °:1
• Attack: 0.1 msec
• Release: 90 msec

Pou plis enfòmasyon sou konpresè yo ak aplikasyon yo, konsilte Yamaha Sound Reinforcement Handbook (Hal Leonard Publishing, #HL 00500964). Liv sa a se yon zouti ki gen anpil valè pou débutan ak veteran yo, epi li gen yon richès enfòmasyon sou teyori ak aplikasyon pratik ranfòsman son.

OPERASYON STEREO

Konprese yon siyal de kanal (stereo) ak de konpresè endepandan kreye yon pwoblèm: si yo konprese yon kanal plis pase lòt la, imaj stereo a ap deplase sou yon bò, sa ki lakòz yon dezekilib nan chan son stereo a. Pou anpeche deplasman, DOD te enkòpore yon switch Stereo Link sou 866 la. Switch sa a pèmèt tou de kanal yo swiv an inison pafè pandan detektè yo pou chak kanal fonksyone endepandamman. Lè yo peze switch Link la, detektè yo lye ansanm epi tou de kanal yo reyaji a siyal ki pi wo nan de kanal yo. Sa elimine chanjman kanal, epi imaj stereo a konsève.

APLIKASYON ESPESYAL
The uses for a compressor don’t end with compression and protective limit-ing. Applications such as “ducking”, “deessing”, and “de-thumping” can be achieved with equal ease, and their uses are many.
866 la bay Antre ak Sòti Chèn Side, ki pèmèt aksè dirèk nan sikui detektè chak chanèl. Piske detektè yo kontwole konpresyon VCA a (voltage-kontwole amplifier), yon moun ka kontwole materyèl pwogram nan ak yon siyal ki pa gen rapò ditou. Sa fèt lè yo mete siyal kontwòl la nan Antre Chèn Side la.
Ducking se yon bon ansyenample nan kalite aplikasyon sa a. Ducking se tou senpleman rediksyon genyen yon siyal lè yon lòt prezan. Teknik sa a lajman itilize nan difizyon espò pou diminye nivo siyal foul moun nan lè moun k ap anonse a ap pale. Prezantasyon anamplified voice of the announcer is sent to a side chain input to compress the noise of the crowd. The voice and crowd signals are then mixed together. For this type of application, the com-pression ratio is kept fairly low with long attack and release times.

The Side Chain output is provided so that the controlling signal (not the pro-gram material) may be modified before reaching the detectors.
The most common use of this technique is for deessing. A d-esser reduces the high frequency sibilance in the “s”s and “t”s of speech to prevent tape saturation or high frequency driver damage. Connect the Side Chain Output to an equalizer whose output is connected to the Side Chain Input of the 866.
The areas where most of the “ess” energy is located are between 2.5 kHz and 10 kHz. If these areas are boosted on the equalizer, the gain of the program material will be reduced more by the compressor because of the excess gain  in that frequency range, thus reducing the sibilance of the program material. Attack and Release times should be set fairly short, and the compression ratio should be below 8:1.

SPECIFICATIONS

• Frequency Response: 10 Hz – 30 kHz, ±0.5 dB.
• THD+Noise: 0.06%.
• Signal-To-Noise Ratio: -97 dB.
• Input Impedance: 20 K½ unbalanced, 40k½ balanced.
• Maximum Input Level: +21 dBu (ref.:0.775 Vrms).
• Output Impedance: 51½ unbalanced, 102½ balanced.
• Maximum Output Level: +21 dBu (ref.: 0.775 Vrms).
• Side Chain Input Impedance: 10 k½.
• Side Chain Maximum Input Level: +21 dBu (ref.: 0.775 rms).
• Side Chain Output Impedance: 51½ unbalanced, 102½ balanced.
• Side Chain Maximum Output Level: +21 dBu (ref.: 0.775 Vrms).
• Gate Threshold: Adjustable from -55 dBu to -10 dBu.

DOD ELECTRONICS CORPORATION

• 8760 SOUTH SANDY PARKWAY
• SANDY, UTAH 84070
• DISTRIBYON ENTÈNASYONAL
• 3 OVERLOOK DR. UNIT 4
• AMHERST, NEW HAMPSHIRE 03031
• USA
• FAX 603-672-4246
• DOD SE YON MAK ANREJISTRE DE
• DOD ELECTRONICS
• © 1994 DOD ELECTRONICS
• KÒPRASYON
• ENPRÈTE Ozetazini 2/94
• fabrike Ozetazini
• DOD 18-0121-B

FAQ 

Can I service the unit myself if needed?

No, it is recommended to refer all servicing to qualified personnel to avoid risks.

Kisa mwen ta dwe fè si likid koule sou inite a?

Shut off the unit immediately and take it to a dealer for service.

What should I do in case of a mains plug damage?

Do not use a damaged mains plug and seek approved replacement fuses from your local retailer.

Dokiman / Resous

Pwosesè Siyal DigiTech RTA Seri II [pdfManyèl Enstriksyon RTA Seri II, 834-835 Seri II, 844 Seri II, 866 Seri II, RTA Seri II Processeur Siyal, Processeur Siyal, Processeur

Referans

• Manyèl itilizatè