Denon DN-470A Professional Power Amplifier User Guide

Introduction

Thank you for purchasing the Denon DN-470A. Denon Professional designs its equipment with a focus on performance and reliability to enhance your audio experiences.

Box Contents

• DN-470A unit
• (2) 6-Pin Euroblock Connectors
• (4) 4-Pin Euroblock Connectors
• Power Cable
• Rack Ears with Screws
• User Guide
• Safety & Warranty Manual

Support

For the latest product information, including documentation, technical specifications, system requirements, compatibility information, and product registration, visit denonpro.com.

For additional product support, visit denonpro.com/support.

Features

Front Panel

1. Power Switch:

Press this switch to power the DN-470A on or off.

2. Level Knobs:

Turn these knobs to set the output level for each channel.

3. Signal/Clip/Protection LEDs:

These lights indicate the signal status of each channel input:

• Signal LED: Illuminates green when receiving a signal at an optimal level.
• Clip LED: Illuminates red when the signal is "peaking" (higher than 0 dB). Turn the Level knob counter-clockwise or reduce the source volume to prevent "clipping" (distortion).
• Protection LED: Illuminates red if the unit enters heat protection mode, disabling sound output. To restore sound, ensure good ventilation and decrease the signal level.

4. Air Intake Vents:

Keep these vents clear of obstructions to ensure proper airflow through the front grill for optimal performance.

Rear Panel

1. Power Inlet:

Connect the included power cable to a power outlet here.

2. Fuse:

If the unit's fuse is broken, lift the tab to replace it with a fuse of the appropriate rating. Using an incorrect rating can damage the unit and/or fuse.

3. Inputs:

Use Euroblock connectors to connect your audio sources. Each channel input features ground (G), cold/negative (-), and hot/positive (+) connectors. Ensure wiring matches these connections.

4. Outputs:

Use Euroblock connectors to connect your loudspeakers. Each channel output has a switch for 70V and 100V operation. Ensure correct wiring for each loudspeaker.

5. Operation Mode Switch:

Select the operation mode (70V or 100V) for each channel's output by adjusting the dip-switches.

6. Exhaust Vents:

Air flows from the front intake through the unit and exits here. Do not block these vents for proper performance.

Setup

Items not listed under Introduction > Box Contents are sold separately.

1. Connect audio sources to the rear panel inputs using the included Euroblock connectors. Each channel input has ground (G), cold/negative (-), and hot/positive (+) connectors.
2. Connect loudspeakers to the rear panel outputs using the included Euroblock connectors. Each channel output has a 70V and 100V switch.
3. Connect the power inlet to a power outlet using the included power cable.
4. Power on all connected audio sources (e.g., Blu-ray players, stereos, microphones, amplifiers).
5. Press the power switch to turn on the DN-470A.
6. Adjust the level knobs for each channel input as needed.

Example Setup Diagram Description

The diagram illustrates a typical setup: A Denon Receiver (model AVR-X4000) is shown connected to the DN-470A's inputs. The DN-470A's outputs are connected to two sets of loudspeakers. A Blu-ray Player is shown connected to the Receiver. The DN-470A is connected to a power source.

Using a Euroblock Connector

1. Twist speaker wire into a tight strand and insert it into the appropriate port until secured.
2. Attach the Euroblock connector to the terminal on the DN-470A.
3. To disconnect a wire, use a small screwdriver to press the spring above the insert port while pulling out the wire.

Troubleshooting

If you encounter a problem, try these initial steps:

• Ensure all cables and connected devices are properly and securely connected.
• Verify you are using the DN-470A as described in this user guide.
• Confirm your other devices or media are functioning correctly.
• If the DN-470A is not working properly, consult the following table for solutions:

Technical Specifications

Specifications are subject to change without notice.

Trademarks & Licenses

Denon is a trademark of D&M Holdings Inc., registered in the U.S. and other countries. Denon Professional products are produced by inMusic Brands, Inc., Cumberland, RI 02864, USA. NEMA® is the registered trademark and service mark of the National Electrical Manufacturers Association. All other product names, company names, trademarks, or trade names are those of their respective owners.

Important Safety Instructions & Warranty Information

Important Safety Instructions

1. Read and keep these instructions. Heed all warnings and follow all instructions.
2. Do not use this apparatus near water (if applicable).
3. Clean only with a dry cloth.
4. Do not block any ventilation openings (if applicable). Install in accordance with the manufacturer's instructions. Do not install this equipment in a confined or "boxed-in" space such as a bookcase or similar unit, and maintain good ventilation conditions. The ventilation should not be impeded by covering the ventilation openings with items such as newspaper, tablecloths, curtains, etc.
5. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not place exposed flame sources such as lighted candles on the apparatus.
6. Do not defeat the safety purpose of the polarized or grounding-type plug (if applicable). A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong is provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
7. (If applicable) Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
8. Only use attachment/accessories specified by the manufacturer.
9. Use only the cart, stand, tripod, bracket or table specified by the manufacturer, or sold with the apparatus (if applicable). When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
10. Unplug this apparatus during lightning storms or when unused for long periods of time.
11. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
12. Power Sources (if applicable): This product should be connected to a power supply only of the type described in these operating instructions, or as marked on the unit.
13. Internal/External Voltage Selectors (if applicable): Internal or external voltage selector switches, if any, should only be reset and re-equipped with a proper plug for alternative voltage by a qualified service technician. Do not attempt to alter this yourself.
14. Water and Moisture (if applicable): This product should be kept away from direct contact with liquids. The apparatus shall not be exposed to dripping or splashing and that no objects filled with liquids, such as vases, shall be placed on the apparatus.
15. Caution (if applicable): Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type. Batteries (a battery pack or an installed battery) shall not be exposed to excessive heat such as sunshine, fire, etc.
16. (If applicable) Where the mains plug or an appliance coupler is used as the disconnect device, the disconnect device shall remain readily operable.
17. Protective earthing terminal (if applicable): The apparatus should be connected to a mains socket outlet with a protective earthing connection.
18. (If applicable) This symbol means the equipment is a Class II or double-insulated electrical appliance. It has been designed in such a way that it does not require a safety connection to electrical earth.
19. Warning (if applicable): Provide an earthing connection before the mains plug is connected to the mains. When disconnecting the earthing connection, be sure to disconnect it after pulling the mains plug out from the mains.
20. This apparatus is for professional use only. Intended operational climate: tropical, moderate.
21. (If applicable) When moving or not using the appliance, secure the power cord (e.g., wrap it with a cable tie). Be careful not to damage the power cord. Before using it again, make sure the power cord has not been damaged. If the power cord has been damaged at all, bring the unit and cord to a qualified service technician for repair or replacement as specified by the manufacturer.
22. Warning (if applicable): Excessive sound pressure (high volumes) from headphones can cause hearing loss.
23. Warning (if applicable): Please refer to any important information (e.g., electrical, safety, etc.) printed on the exterior bottom enclosure or rear panel before installing or operating the product.

Service Instructions

• Disconnect power cord before servicing.
• Replace critical components only with factory parts or recommended equivalents.
• For AC line powered units: Before returning a repaired unit to the user, use an ohmmeter to measure from both AC plug blades to all exposed metal parts. The resistance should be more than 2,000,000 ohms.

Safety Notices

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE ANY COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY. ?

DANGEROUS VOLTAGE: The lightning flash with arrowhead symbol within the equilateral triangle is intended to alert the user to the presence of un-insulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock. ⚡

INSTRUCTIONS: The exclamation point within the equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying this appliance. ⚠️

WARNING: To reduce the risk of fire or electrical shock, do not expose this appliance to rain or moisture. Electrical equipment should NEVER be kept or stored in damp environments. ⚠️

CAUTION (for U.S.A. & CANADIAN models only): TO PREVENT ELECTRIC SHOCK DO NOT USE THIS (POLARIZED) PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.

Notices

NOTICE CONCERNING LASER PRODUCTS: DANGER: INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCK FAILED OR DEFEATED. AVOID DIRECT EXPOSURE TO BEAM. USE OF CONTROLS OR ADJUSTMENTS OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

NOTICE CONCERNING FCC REGULATIONS: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. If this equipment causes harmful interference to radio or television reception, the user is encouraged to try to correct the interference by one or more of the following measures: reorient or relocate the receiving antenna; move this unit; increase the separation between the equipment and receiver; connect the equipment into an outlet on a circuit different from that to which the receiver is connected; ensure all cables are properly shielded; or consult the dealer or an experienced radio/television technician.

This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

FCC RF Radiation Exposure Statement: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. End users must follow the specific operating instructions for satisfying RF exposure compliance. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

For Canadian models: This device complies with Industry Canada licence-exempt RSSs. Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum gain approved by Industry Canada. This unit does not exceed the Class B limits for radio noise emission from digital apparatus.

ESD/EFT Warning: This unit may contain a microcomputer for signal processing and control functions. In very rare situations, severe interference, noise from an external source, or static electricity may cause it to lock up. In the unlikely event that this should happen, turn off the unit, wait at least five seconds, and then turn it back on again. The pins of connectors identified with this ESD warning symbol should not be touched.

For best audio quality, avoid using this device in a high RF-radiated environment. In an environment with radio frequency interference, the unit may malfunction and resume normal operation after removal of the interference.

For 240-volt use in U.K., use NEMA-style 240-volt plug. For other countries use proper plug for local outlet.

Double-Insulated: When servicing, use only identical replacement parts.

Correct Disposal of This Product: This marking indicates that this product should not be disposed of with other household wastes throughout the EU. To prevent possible harm to the environment or human health from uncontrolled waste disposal, recycle it responsibly to promote the sustainable reuse of material resources. To return your used device, please use the return and collection systems or contact the retailer where the product was purchased. They can take this product for environmentally safe recycling. ?️

Disposal of Batteries (if applicable):

• Never dispose of batteries in fire or near excessive heat or direct sunlight.
• Alkaline batteries & lithium button cell batteries: Can be safely disposed of with normal household waste.
• Do not dispose of large amounts of batteries in a group. Insulate each battery with tape or other non-conductive material to ensure it does not discharge.
• Lead-acid batteries: Dispose of by bringing them to an electronic waste center or recycling center, or dispose of them in accordance with your local ordinances.

California Proposition 65 Warning: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. ⚠️

General Note on the Declaration of Conformity: This device is in accordance with the essential requirements of the European Directive 2014/53/EU. The full EU declaration of conformity can be requested at the address shown here or at denonpro.com/safety.

Product Warranty

For products purchased in the U.S.A.

1. What is covered and for how long? inMusic Brands, Inc. ("inMusic") warrants to the original purchaser that Denon Professional ("Denon Pro") products and all other accessories are free from defects in material and workmanship under normal use and service for one (1) year from the date of purchase from an authorized Denon Pro dealer. Factory-refurbished merchandise is warranted for ninety (90) days from the original date of retail sale. This refurbished merchandise warranty is not transferable.

2. What is not covered? This Limited Warranty does not cover: damage from improper installation or connection, external electrical faults, use of non-Denon Pro parts, products purchased from unauthorized dealers, unauthorized modifications, equipment with removed/illegible serial numbers, normal cosmetic and mechanical wear, damage or loss during transit to a repair center, or units purchased/located outside the continental USA.

3. What are inMusic's obligations? During the warranty period, Denon Pro will repair or replace, at its sole option, any defective component part free of charge. To obtain service, purchaser must first contact Denon Pro for a return merchant authorization (RMA) number. The product must be returned in adequate packaging with the sales receipt or proof of sale, serial number, and seller's name/address. Contact Denon Pro customer service at 401-658-5766 for an RMA number and return assistance. Denon Pro may use rebuilt, reconditioned, or new parts/components for repairs or replacements. Repaired products are warranted for the remainder of the original warranty or 90 days, whichever is longer. All replaced parts become Denon Pro property. If a product is not covered, purchaser must pay for all repair and return charges.

4. What are the limits on inMusic's liabilities? Warranties, including implied warranties of merchantability or fitness for a particular purpose, are limited to the duration of this Limited Warranty. InMusic or Denon Pro shall not be liable for any special, incidental, consequential, indirect damages, loss of profits, property damage, or injury arising out of the use, misuse, or inability to use any Denon Pro product, breach of warranty, or negligence, even if advised of such damages. This Limited Warranty is the complete warranty and is given in lieu of all other express warranties. It extends only to the original purchaser and states the purchaser's exclusive remedy. Partial illegality or unenforceability of any part of this warranty does not affect the remainder.

5. How does state law apply to this warranty? Some states do not allow limitations on incidental or consequential damages or implied warranty duration, so these limitations may not apply. This Limited Warranty gives you specific legal rights, and you may also have other rights that vary by jurisdiction.

Please record your unit's serial number and dealer information, and retain your original purchase receipt. Register your product at denonpro.com.

For products purchased outside of the U.S.A.

1. Warranty: inMusic Brands, Inc. ("inMusic") warrants to the original purchaser that Denon Professional ("Denon Pro") products are free from defects in material and workmanship under normal use and service for one (1) year from the date of purchase from an authorized Denon Pro dealer.

2. Warranty Conditions: This Limited Warranty is conditioned upon proper use of the product. It does not cover: defects or damage from accident, misuse, abuse, neglect, unusual physical or electrical stress, modification of any part, cosmetic damage, equipment with removed/illegible serial numbers, scratched or damaged external parts due to normal use, or defects/damage from improper testing, operation, maintenance, installation, adjustment, or service.

3. inMusic's Obligations: During the warranty period, Denon Pro will repair or replace, at its sole discretion, any defective component part free of charge. Denon Pro may use rebuilt, reconditioned, or new parts/components for repairs or replacements. Repaired products are warranted for the remainder of the original warranty or 90 days, whichever is longer.

4. Liability Limits: Warranties, including implied warranties of merchantability or fitness for a particular purpose, are limited to the duration of this Limited Warranty. inMusic or Denon Pro shall not be liable for any special, incidental, consequential, indirect damages, loss of profits, property damage, or injury arising out of the use, misuse, or inability to use any Denon Pro product, breach of warranty, or negligence. This Limited Warranty is the complete warranty and is given in lieu of all other express warranties. It extends only to the original purchaser and states the purchaser's exclusive remedy. Partial illegality or unenforceability of any part does not affect the remainder.

Some jurisdictions do not allow limitations on implied warranty duration, so these limitations may not apply. This warranty gives you specific legal rights, and you may also have other rights which vary under local laws.

Please record your unit's serial number and dealer information, and retain your original purchase receipt. Register your product at denonpro.com.

Return Information

• Obtain a return merchant authorization number from your local Denon Pro representative (visit denonpro.com).
• Include a copy of the original sales receipt for warranty repairs.
• Pack faulty equipment in its original packaging.
• Include an additional outer layer of packaging for transit safety. Failure to do so may jeopardize the warranty.
• Denon Pro does not accept COD shipments or issue call tags for merchandise returns.
• Repaired merchandise will not be returned by priority service except by written request at the customer's cost.
• Send defective equipment freight prepaid with the RMA number clearly printed on the outer packaging and original sales receipt enclosed to your local service center.

Very Important

Please read this section before connecting this unit to your system:

For optimum performance:

• Slide faders are subject to wear; excessive force can wear them out quickly. User-replaceable slide faders are not covered by warranty.
• Never use spray cleaners on slide controls, as residues can cause dirt build-up and void the warranty. If controls malfunction due to dirt/dust, consult a professional technician.
• Always ensure AC power is off before making any connections.
• Use appropriate cables. Avoid excessively long cables (over 32 feet / 10 meters). Ensure plugs and jacks are tightly mated, as loose connections can cause hum, noise, or intermittents that could damage speakers. Use readily available low-capacitance stereo cables for input/output connections. Cable quality significantly impacts audio fidelity. Consult your Denon Pro dealer or an audio specialist if unsure about cable selection.
• Never attempt adjustments or repairs not described in this manual. Take the unit to your dealer or an authorized Denon Pro service center.
• Always turn amplifiers on last and off first. Begin with master faders or volume controls at minimum and amplifier gain/input controls down. Wait 8-10 seconds before turning up the volume to prevent transients that could cause severe speaker damage.
• Use restraint when operating controls; move them slowly. Rapid adjustments could damage equipment due to amplifier clipping.
• Avoid amplifier "clipping" (when red LEDs on power amplifiers flash) at all costs. Clipping means the power amplifier is distorting and working beyond its limits, which is a main cause of speaker failure.
• To prevent fire or shock hazard, do not expose the unit to rain or moisture. Never place cans of liquids near or on top of the unit. ⚠️
• Headphone outputs can be set to levels that may cause hearing damage. Use caution.
• This unit may contain a microcomputer for signal processing. In rare situations, severe interference, external noise, or static electricity may cause it to lock up. If this occurs, turn off the unit, wait at least five seconds, and turn it back on.
• Under rare circumstances, exposure to electromagnetic interference during use may cause a slight drop in signal-to-noise ratio.
• Intended electromagnetic environments: residential, commercial, light industrial, urban outdoors.

Contact Information

World Headquarters

inMusic Brands, Inc.
200 Scenic View Drive
Cumberland, RI 02864
USA

Tel: 401-658-5766
Fax: 401-658-3640

U.K. Office

inMusic Europe, Ltd.
Unit 3, Nexus Park
Lysons Avenue
Ash Vale
HAMPSHIRE GU12 5QE
UNITED KINGDOM

Tel: 01252 896 040
Fax: 01252 896 021

Germany Office

inMusic GmbH
Harkortstr. 12 - 32
40880 Ratingen
GERMANY

Tel: 02102 7402 20150
Fax: 02102 7402 20011

Website: denonpro.com