ART Attack Amplifiers User's Guide

Introduction

Congratulations on your purchase of an Attack amp, representing a significant advancement in amplification technology. These amplifiers combine traditional overdrive and clean tones with ART's Quad-S Sonic Stereo Spatial Sound, plus built-in sustainer/compressor and chorus circuits. They offer versatility for modern musicians, featuring dual-channel operation, sophisticated signal processing, flexible patching options, a roadworthy housing, and 80 or 100 watts of power capable of driving up to three cabinets.

Features

• High power
• Low noise
• Built-in chorus
• Built-in sustainer/compressor
• Dual-channel operation
• Quad-S stereo emphasis circuitry
• Lightweight, durable carbon fiber composite cabinet
• Extremely strong steel grille
• Remote footswitch jack for channel switching and Lead Turbo Gain Boost
• Stereo effects loop
• Stereo line output
• Stereo headphone jack
• Designed and manufactured in the United States of America

For your reference, please fill in the following information:

Model name: [User to fill in]

Date of purchase: [User to fill in]

Purchased from: [User to fill in]

Serial number: [User to fill in]

Model Number Reference: 700-5004-101

Quick Start Instructions

Follow these steps to quickly get your Attack amp up and running:

1. Plug the AC power cord into the back of the amp.
2. Plug the AC power cord into the wall socket.
3. Plug your instrument into either the High Gain Input (for overdrive tones) or the -6dB Input (for cleaner tones) using a good, shielded cord.
4. Ensure the Clean Channel Level, Lead Channel Level, and Master Level knobs are turned fully counterclockwise (down).
5. Verify the front-panel Speaker On/Off switch is in the "on" position.
6. Turn on the amp using the recessed power switch on the back. Note: If your amp has a tube preamp (Models T28, T12, T12C), allow about a minute for it to warm up.
7. Gradually turn up the Clean Channel Level, Lead Channel Level, and Master Level knobs.
8. Turn up your instrument's volume and begin playing, adjusting levels to your preference.

Familiarize yourself with the controls by twisting knobs and pushing buttons to explore the amp's sound range.

Front Panel Jacks Diagram Description

The front panel features two input jacks:

• High Gain Input: Labeled "HIGH GAIN INPUT". This is the primary input for achieving overdrive distortion.
• -6dB Input: Labeled "-6 dB INPUT". This input provides less gain, suitable for maximum headroom and cleaner sounds.

Front Panel Controls

AC Power LED

This LED illuminates when the amplifier is powered on. If it does not light up, refer to the Fuseholder section on page 12.

About the Clean Channel

The Clean channel provides a crystal-clear sound, ideal for samplers, drum machines, and certain guitar styles. It offers sufficient gain to drive the amp beyond full clipping, allowing for distortion even on this channel. The built-in EQ provides a balanced sound, with front-panel EQ controls allowing adjustments within their specified ranges for various sounds. The EQ center frequencies are optimized for guitar.

Clean Channel LED

This LED indicates that the instrument signal is routed through the Clean Channel, and all associated functions are active.

Clean Chan Level

This control adjusts the instrument's signal level before it reaches the preamp. Setting it too low while increasing the Master Level can result in an anemic signal, potentially increasing noise. The Clean Chan Level works with the Master Level to determine the amount of distortion. Even on the clean channel, high-output pickups or high Clean Chan Level settings can introduce grit, adding dynamics to rhythm playing. Refer to the Front Panel Jacks section for optimal clean level settings.

Low EQ

This control shapes the foundational tone. It features a fixed center frequency with a boost/cut range of ±12dB. At the 12 o'clock position, there is no boost or cut. The effect of this control varies with volume and distortion levels, as well as speaker response.

Mid EQ

This circuitry adds "meat" or "body" to the sound. It has a fixed center frequency with a boost/cut range of ±12dB. At 12 o'clock, there is no boost or cut. Boosting this control can create a fuller sound, while cutting it, especially with heavy overdrive, can produce a "sucked-out" tone.

High EQ

This control adjusts the highlights of your tone, offering a boost/cut range of ±12dB at a selected center frequency. At the 12 o'clock position, there is no boost or cut. The perceived effect of the High EQ can change based on the amount of distortion and whether the Lead Turbo Gain Boost or Bright Boost is engaged.

Sustainer/Compressor

This feature provides musical attack and decay characteristics, similar to vintage tube and pedal compressors. It offers three settings:

To select settings: push the left switch for Low, the right switch for Mid, and both switches for High. An LED between the switches illuminates when a gain reduction of more than 1dB occurs, serving as an indicator for setting clean level controls. The Clean Chan Level control is applied after the compressor, allowing easy balancing of compressed and uncompressed sound levels.

Channel Select switch

This switch toggles between the Clean Channel and the Lead Channel. An LED indicator on each channel shows which is active. Switching can also be performed via a remote footswitch (see Remote Switch section, page 13).

About The Lead Channel

The Lead Channel is designed to produce a wide range of lead tones, from clean and crunchy to singing sustain and extreme overdrive. Its EQ controls are optimized for guitar. Additional features include a Bright Boost switch, an EQ Para Shift/Contour switch, and the Lead Turbo Gain Boost switch.

Lead Channel LED

This LED indicates that the instrument signal is routed through the Lead Channel, and all associated functions are active.

Lead Chan Level

This knob controls the Lead Channel preamp's volume and works with the Master Level to set the overall amp level and distortion amount. Higher settings generally result in more distortion, influenced by pickup output, effects, and other tone controls.

EQ Para Shift/Contour

This switch works with the Mid EQ to shift its center frequency. To hear its effect, the Mid EQ control should not be at the 12 o'clock position. When the Mid EQ is cut (-12dB) and Bass/Treble are slightly boosted, this switch offers two distinct metal sounds. With Mid EQ boosted and Bass/Treble centered, it can produce a mid-focused American amp sound. Engaging the switch can provide a more British-style texture.

Bright Boost

This feature adds treble pre-emphasis to the front end of the distortion circuitry, similar to a bright switch on vintage amps, resulting in a denser high end suitable for lead playing.

Lead Turbo Gain Boost

This switch adds extra gain to the Lead Channel, enabling a virtual three-channel setup (Clean, Rhythm Distortion, Lead Distortion). Using an external footswitch is recommended for easy control.

Reverb Level

Controls the amount of spring reverb effect applied to signals from both preamp channels.

Chorus

This knob adjusts the speed of the chorus sweep. Clockwise increases speed, counterclockwise slows it down. It thickens the sound and can create a stereo image from mono sources. The effect is more pronounced in stereo. The Chorus and Quad-S features complement each other.

Chorus Switch

Press this switch to activate or deactivate the chorus effect. An LED indicates when the chorus is on. The chorus has preset depth and mix, with stereo output.

Master Level

This control governs the amplifier's maximum loudness and is the second part of the Clean Channel Level and Lead Channel Level controls. Adjusting channel levels and the Master Level affects both distortion characteristics and overall loudness.

Quad-S switch

This feature creates a wider stereo feel, especially when the chorus is active or an extension speaker cabinet is used. It converts a mono source into a stereo image. Models T28 and S28, with their stereo-driven speakers, exhibit this effect prominently. For the Quad-S effect to be most apparent, the amp should be in stereo mode. In mono mode, tonal differences and bass enhancement may be heard, but the full stereo imaging effect will not be present. The Quad-S and Chorus enhance each other in both stereo and mono modes.

EFX Loop In switch

This switch bypasses any effects plugged into the effects-loop jacks. It's advisable to check its status before playing.

Speaker On/Off switch

This switch allows you to turn off the internal speakers, useful for tuning or practicing with headphones. Headphones can be used even when the speaker is on.

Front Panel Jacks

High Gain Input

This is the standard input, designed to provide ample gain before clipping with most pickups.

-6dB Input

Use this input if your guitar has hot pickups, an active preamp with significant gain, or if you desire a clean sound that avoids clipping. ART engineers suggest plugging into the clean channel, turning off the Compressor/Sustainer (both switches out), and adjusting the Clean Channel Level. The LED between the compressor switches will act as an input clipping indicator. Aim for a setting where the LED rarely or never lights, except when playing a strong chord.

EFX/Preamp Output

This jack provides signal output between the amplifier's preamps and power amp section. A standard shielded cord from this output to a signal processor, and another from the processor to the Left (mono) Stereo FX Return/Power Amp In jack, is the recommended connection method. If your signal processor has stereo outputs, connect the second output to the right Stereo FX Return/Power Amp In jack. Ensure your signal processor's mix output is used for returning to the amp. If the "send" cord is fully inserted, the output includes reverb but not chorus. If the plug is inserted halfway (with a click), the output contains only the preamp signal, bypassing reverb and chorus. Always check the EFX Loop In switch to ensure the loop is not bypassed.

Note: If your amp has only one speaker and no external speakers connected, the stereo return signal will be automatically mixed to mono.

Caution: Always turn off the amp or lower channel volumes before connecting external gear.

The EFX/Preamp Output can provide two types of output:

• Preamp output with reverb (no chorus): Insert the plug fully into the jack.
• Preamp signal without reverb or chorus: Insert the plug halfway (it will click into place). This is useful for recording the basic signal directly.

Stereo FX Rtrn/Pwr Amp In L&R

These jacks are located after the reverb and before the Chorus, Quad-S, and Master Level controls. For mono effects, connect their output to the Left Stereo FX Return/Power Amp In jack. For stereo effects, use both jacks. Using the right jack alone sends signal only to the right power amp.

Stereo Line Out

Provides post-effects and pre-Master Level outputs for recording or PA connection. The tip is wired for the left channel, and the ring for the right.

Stereo Headphone

Offers ample output for most headphones. This jack remains active even when the Speaker On/Off switch is in the "off" position.

Rear Panel

Diagram Description (Dual 8"-equipped models T28 and S28)

The rear panel features:

• POWER: IEC power connector.
• FUSE: Fuseholder for protection.
• REMOTE SWITCH: 1/4" TRS jack for footswitch control.
• LEFT EXT. SPKR: For connecting an external speaker (8 ohm minimum).
• RIGHT EXT. SPKR: For connecting an external speaker (4 ohm minimum).
• Voltage and fuse ratings are indicated (e.g., 117V AC 1.5A 60Hz - FUSE 1.5A SLO-BLO; 230V AC 0.75A 50Hz - FUSE 1.0A SLO-BLO).

Diagram Description (Single 12"-equipped models T12, T12C, and S12)

The rear panel features:

• POWER: IEC power connector.
• FUSE: Fuseholder for protection.
• REMOTE SWITCH: 1/4" TRS jack for footswitch control.
• PRIMARY EXT. SPKR: For connecting an external speaker (8 ohm minimum).
• SECONDARY EXT. SPKR: For connecting an external speaker (4 ohm minimum).
• Voltage and fuse ratings are indicated (e.g., 117V AC 1.5A 60Hz - FUSE 1.5A SLO-BLO; 230V AC 0.75A 50Hz - FUSE 1.0A SLO-BLO).

AC Cord Receptacle

A detachable power cord connects here. Always use the supplied cord. If replacement is needed, use the same type. Plug into a grounded electrical socket whenever possible. The 3-pin plug provides protection against shocks. Do not remove the ground pin. If using a 2-pin outlet, a ground-lift adapter may be needed. Avoid long extension cords, as they can reduce voltage and affect performance.

On/off Switch

This switch powers the amplifier on ('I') and off ('O').

Fuseholder & Fuse Values

The fuse protects the amp's circuits from electrical malfunctions. The fuse type is typically:

• In U.S.A.: 3AG, 1.5 ampere Slo-Blo
• In Europe: 1 ampere Slo-Blo

A blown fuse is indicated by the front-panel AC Power LED not illuminating and no sound. Before replacing a fuse, check the power switch and ensure the line cord is properly plugged into a live wall socket. To access the fuse, turn off the amp, unplug it, grasp the fuseholder, push in, and turn counterclockwise to remove. Replace with an identical fuse. If a replacement fuse blows, consult your ART dealer or Customer Service.

Remote Switch

The rear-panel jack marked "Remote Switch" accommodates two switches for controlling Channel Select and Lead Turbo Gain Boost. It uses a 1/4" TRS (tip/ring/sleeve) connector, the type commonly used for stereo headphones. For two footswitches, connect them to a 1/4" TRS plug as follows:

• Connect the first switch to the Tip.
• Connect the second switch to the Ring.
• Connect the common ground to the Sleeve.

The switches should be of the push-on/push-off type.

Diagram Description: Remote Switch Connections

The diagram illustrates the rear panel layout and the wiring for the remote switch. The Channel Select function is connected to the tip, and the Lead Turbo Gain Boost to the ring. The sleeve serves as the common connection.

Note: The front-panel switches invert the operation of the external switches. For example, if a footswitch selects the Lead Channel, pressing the front-panel Channel Select button will switch to Clean Channel. This can be useful for synchronizing LEDs on a footswitch with the front panel indicators.

About The External Speaker Jacks

All Attack Module amps feature stereo processing from the effects section through the power amp stages.

Single 12" Speaker Models

For single 12" models, the power amps operate in bridged mono mode when no external speaker is connected, maximizing output power. To experience the full stereo effects processing, connect an external speaker to the jack labeled Primary Ext. Spkr.. This splits the power amps into stereo, with each speaker receiving half the total voltage. The Secondary Ext. Spkr. jack is used for a second extension speaker when the Left Ext. Spkr. jack is used first.

Note: Always use extension speaker cabinets with an 8-ohm impedance.

Dual 8" Speaker Models

For dual 8" speaker-equipped models, the internal speakers are already powered in stereo, so connecting external speaker cabinets does not require a specific order.

Warning: Never connect an External Speaker output to the input of any amplifier, tape recorder, mixer, headphones, or signal processor. The high power output from the Attack's power amp section can cause significant damage to equipment designed for instrument- or line-level sources. Only connect speakers with adequate power-handling capabilities to the External Speaker outputs.

Connecting the Attack Amplifier with Other Gear

These illustrations and descriptions guide you in connecting your Attack amp to other amplifiers, extension speaker cabinets, and recording/PA gear. Ensure all equipment is turned off before making or changing connections.

Using The Effects Loop

Connect a shielded cord with a 1/4" plug from the Attack Module's EFX/Preamp Output jack to the input of a signal processor (e.g., an ART FXR Elite). Run the signal processor's mix output to the Attack's Stereo FX Return section's L Pwr Amp In jack. If the processor has stereo outputs, connect the second output to the Stereo FX Return's R Pwr Amp In input.

Note: If the "send" cord is fully inserted into the EFX/Preamp Output jack, the output includes reverb but not chorus. If the plug is inserted halfway (with a click), the output contains only the preamp signal, bypassing reverb and chorus. Ensure the EFX Loop In switch is not bypassed.

Diagram Description: Effects Loop Connection

The diagram shows a connection from the amp's EFX/PREAMP OUTPUT to a signal processor's input, and then from the processor's output to the amp's STEREO FX RETURN L-PWR AMP IN-R jacks. It also shows LINE IN and LINE OUT connections, likely for other gear or mixers.

Slaving One Attack Module Amp

Use a TRS (tip/ring/sleeve)-to-dual-mono shielded cord to connect the Stereo Line Out from the "master" Attack Module to the Stereo FX Rtrn inputs on a second Attack Module amp. This routes all tone and processing from the first amp to the second. Chorus, Quad-S, and Master Level functions remain active on the second amp.

Alternatively, the first amp's EFX/Preamp Output can be used instead of the Stereo Line Out. However, Chorus, Quad-S, and Reverb (if the plug is inserted halfway) effects will not be sent to the second amp. Use a cable with mono 1/4" plugs at both ends for this connection.

Diagram Description: Slaving One Amp

The diagram illustrates a "Master amp" connected via its STEREO LINE OUT to a "Slave amp" via its STEREO FX RTRN L-PWR AMP IN-R. A TRS-to-dual-mono cable is shown.

Slaving Two Attack Module Amps

Use a TRS (tip/ring/sleeve)-to-dual-mono shielded cord to connect the Stereo Line Out from the "master" Attack Module to the Left Stereo FX Rtrn inputs on a second and third Attack Module amp. This routes all tone and processing from the first amp to the other amps. Chorus, Quad-S, and Master Level functions remain active on the slave amps.

Alternatively, the first amp's EFX/Preamp Output can be used instead of the Stereo Line Out. However, Chorus, Quad-S, and Reverb (if the plug is inserted halfway) effects will not be sent to the second amp. Use a "Y" cable with mono 1/4" plugs at all three ends for this connection.

Diagram Description: Slaving Two Amps

The diagram shows a "Master amp" connected via its STEREO LINE OUT to two "Slave amps" via their STEREO FX RTRN L-PWR AMP IN-R jacks. A TRS-to-dual-mono cable is shown connecting the master to the first slave, and then a similar connection to the second slave.

Sending A Direct Signal To P.A. Or Recording Gear

Use a TRS (tip/ring/sleeve)-to-dual-mono shielded cord to connect the Attack Module's line output to the line inputs or channel inputs on a mixer or recorder. This signal includes all tone, distortion, effects, and overdrive characteristics from the amp's output stage.

Alternatively, a mono cord can connect the EFX/Preamp Out to a mixer or recorder channel. If the cord is fully inserted into the EFX/Preamp Output jack, the output includes reverb but not chorus. If the plug is inserted halfway, the output contains only the preamp's signal without reverb or chorus.

Caution: Never use the speaker output.

Diagram Description: Direct Signal to PA/Recording Gear

The diagram shows the amp's EFX/PREAMP OUTPUT and STEREO LINE OUT jacks connected to CHANNEL INPUTS 1-4 on a mixer or recording device. It also depicts an amplifier and a reel-to-reel tape recorder.

Driving Extension Speaker Cabinets

For amps with a single 12" speaker, connect extension speaker cabinets following the order on the rear panel. Use the Primary Ext. Spkr. jack for a single extension cabinet. Use the Secondary Ext. Spkr. jack in addition to the first for a second cabinet. For amps with two 8" speakers, either or both jacks can be used.

Regardless of the amp's speaker configuration, always use speaker cords for connecting extension cabinets. Shielded instrument cables are not designed to handle the high power output from Attack amps.

Diagram Description: Driving Extension Speaker Cabinets

The diagram shows an "Attack Module amp" connected to two "Speaker cabinets". Connections are made from the amp's SPEAKER INPUT, PRIMARY EXT. SPKR. (8 OHM MIN.), and SECONDARY EXT. SPKR. (4 OHM MIN.) jacks to the speaker cabinets' inputs.

Speaker, Enclosure, and Care & Feeding

Speaker

The T12C Attack amp features a Celestion 12" lead guitar speaker. Other models use different speakers, but the internal EQ is modified to achieve a similar sound balance at low and medium levels. The Celestion speaker is noted for its unique cone distortion and directionality, making it a favorite for certain music styles. Other models offer different sonic characteristics at high levels, where speaker dynamics contribute significantly to the overall sound, providing a range suitable for various players.

Enclosure

Attack Module amps and speaker cabinets are constructed from an extremely strong, non-resonant Carbon Fiber Composite material. Internal ribbing and bracing provide acoustic baffling. This design offers the advantages of wood enclosures without the weight and a unique shape. A steel grille protects the speaker, and recessed rear jacks prevent accidental damage or disconnection of speaker cords.

Care & Feeding

Treat your amp with care to ensure its longevity.

• Durability: While built to be roadworthy, avoid dropping, kicking, or using the amp as a basketball. Do not place drinks or burning cigarettes on the amp. Use a protective cover or flight case when moving it.
• Environmental Protection: Do not expose the amp to extreme temperatures (cold or rain) or store it in damp places. Keep it dry and in a reasonably warm environment.
• Tube Warm-up: If your amp has a tube (Models T28, T12, T12C), allow about 60 seconds for the preamp tube to warm up. Use this time for tuning, practicing, or preparing your setlist.
• Power Cord: Ensure the power cord is securely plugged in at both ends. Use only grounded electrical outlets. Avoid adapters that bypass grounding.
• Cleaning: Clean the amp's exterior with a damp cloth or a cloth lightly dampened with a mild dishwashing detergent solution. Ensure the amp is unplugged before cleaning. Avoid exposing the speaker, controls, or jacks to moisture.
• Modifications: Avoid attempting internal modifications or repairs yourself, as this is dangerous and will void the warranty. ART components are chosen for optimum performance, and "hot" replacement tubes may not perform as well as factory-selected ones. Contact ART Customer Service or your dealer for any service needs.

ART Attack Module Speaker Cabinets

Three models of speaker cabinets are available for the Attack Module series:

These cabinets are designed to complement the Attack Module amplifiers, handling their power output to deliver dependable, high-quality tone. Always use speaker cords for connections, never shielded instrument cables. Refer to page 19 for connection diagrams.

Using extension speaker cabinets can enhance sound projection and stereo separation, particularly when using the built-in Chorus and Quad-S effects. For cabinet maintenance, refer to the Care & Feeding section on page 20.

Diagram Description: Rear Panels

Rear panel of Models 732 & 733: Shows INPUT jack (8 OHM), LOOP THROUGH jack, LEFT EXT. SPKR (4 OHM), and RIGHT EXT. SPKR (4 OHM).

Rear Panel of Model 731: Shows INPUT jack (8 OHM), LOOP THROUGH jack, LEFT EXT. SPKR (4 OHM), and RIGHT EXT. SPKR (4 OHM).

About The Connections

The Model 731, with its two 8" speakers, produces stereo sound when plugged into both inputs. Plugging into one input activates only that speaker. Models 732 and 733 are mono cabinets with a single 12" speaker. Connect the amp's output to the cabinet's Input jack. For parallel connections, use the Loop Through jack to connect to another cabinet's Input.

Stacking Amps & Speaker Cabinets

The 731, 732, and 733 cabinets feature robust construction with molded channels. Included rubber blocks help secure stacked cabinets. Place the blocks in the top cabinet's channels and set the amp onto them, ensuring the blocks fit into the amp's bottom channels.

ART Attack Amplifier Specifications

• High Gain Input Impedance: 470k ohms
• -6dB Input Impedance: 470k ohms
• Line Output Impedance: <1k ohm
• Total Harmonic Distortion: <0.4%
• Preamp Tube: One 12AX7A (T28, T12, and T12C models only)
• Output Power: 100 watts RMS into 8 ohms (T28, T12, and T12C models)
• Output Power: 80 watts RMS into 8 ohms (S28 and S12 models)
• Operating Voltage: 115 volts AC in U.S.A. (Products for outside the U.S.A. are configured for country of destination)
• Maximum Power Consumption: 220 watts
• Speaker Impedance: 8", 4 ohms
• Speaker Types: 8" custom-designed Oxford, 12" high-quality custom-designed for ART, 12" Celestion specially designed for ART
• Treble Control: ±12 dB boost/cut
• Midrange Control: ±12 dB boost/cut
• Bass Control: ±12 dB boost/cut
• Reverb Type: 2-spring
• Footswitch Functions: Channel switching, Lead Turbo Gain Boost on/off
• Dimensions: 19" H or W x 15" W or H x 14" D
• Amp Weights: T28 & S28: 24 lbs.; T12 & S12: 28 lbs.; T12C: 31 lbs.
• Speaker Cabinet Weights: Model 731: 17 lbs.; Model 732: 21 lbs.; Model 733: 24 lbs.

ART maintains a policy of continuous product improvement. Specifications are subject to change without notice. ART reserves the right to make design changes or additions without obligation to install them on previously manufactured products.

Designed and manufactured in the United States of America.

Applied Research & Technology, Inc.
215 Tremont Street
Rochester, NY 14608
(716) 436-2720
(716) 436-3942 (FAX)

© 1993 Applied Research & Technology, Inc. All rights reserved.

Warranty & Service Information

Limited Warranty

Warranty service for this unit is provided by Applied Research & Technology, Inc. (ART) in accordance with the following statement.

ART warrants to the original purchaser that this product and its components will be free from defects in workmanship and materials for one year from the date of purchase. ART will, at its option, repair or replace defective products upon prepaid delivery to the factory service department or an authorized service center, accompanied by proof of purchase.

Exclusions

This warranty does not cover misuse, abuse, unauthorized alterations, or repairs. The warranty is void if the serial number is altered, defaced, or removed.

ART reserves the right to make design changes or improvements without obligation to install them on previously manufactured products.

ART shall not be liable for consequential damages, including damages from loss of use. Some states may not allow limitations on incidental or consequential damages. This warranty grants specific rights, and other rights may vary by state.

For units purchased outside the United States, service will be provided by an authorized distributor of Applied Research & Technology, Inc.

Service

If your unit requires service, please follow these guidelines:

1. Confirm that the unit is the source of the problem. Check power supply, cable connections, and cable condition.
2. If the unit is at fault, document the problem, including how and when it occurs.
3. Contact the factory to obtain a Return Authorization (RA) number.
4. Pack the unit securely in its original carton or a suitable substitute. Clearly print the RA number under the shipping address.
5. Include with your unit: a return shipping address (P.O. Boxes are not accepted), a copy of your purchase receipt, a daytime phone number, and a description of the problem.
6. Ship the unit to:
   APPLIED RESEARCH & TECHNOLOGY, INC.
   215 TREMONT STREET
   ROCHESTER, NY 14608
   ATTN: REPAIR DEPARTMENT
   RA # [User to fill in]
7. Contact Customer Service at (716) 436-2720 for your RA number or repair inquiries. Customer Service hours are 9:00 AM to 4:00 PM Eastern Time, Monday through Friday.

Customer Service

ART's Customer Service Department can be contacted between 9:00 AM and 4:00 PM Eastern Time, Monday through Friday. They can answer technical questions about ART products and provide service information.

Block Diagram of the Attack Module

The block diagram illustrates the signal flow and internal components of the Attack Module amplifier. The signal path begins at the input stage, which includes a High Gain Input and a -6dB Input feeding into an Input Buffer.

From the buffer, the signal enters a 3-Band EQ and a Sustainer/Compressor. The output of these sections feeds into the Clean Channel Preamp, controlled by the Clean Chan Level knob. A Channel Selector switch routes the signal to either the Clean Channel or the Lead Channel Preamp.

The Lead Channel Preamp is controlled by the Lead Chan Level knob and includes a 3-Band EQ with a Mid Threshold adjustment. Additional lead channel features include Bright Boost, Lead Turbo Gain Boost, and EQ Para Shift/Contour switches, each with associated LEDs.

The signal from either preamp channel then passes through a Reverb Circuit, a Chorus Circuit, and a Quad-S Circuit. The Master Level control adjusts the overall output volume. The Chorus and Quad-S circuits have associated LEDs and On/Off switches.

The signal then goes to the Power Amps and then to the Speakers. There are also outputs for Stereo FX Return/Power Amp In (L & R), Stereo Line Out (L & R), and a Stereo Headphone jack.

A Remote Switch jack allows external control of channel selection and gain boost functions.

The diagram also includes a Guide to Symbols key, explaining representations for knobs, switches, LEDs, and connections.