Integra ADM-20.4 Power Amplifier Instruction Manual

Integra ADM-20.4 Power Amplifier Instruction Manual

WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.
CAUTION:
TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER- SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

WARNING: RISK OF ELECTRIC SHOCK DO NOT OPEN

AVIS: RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

Important Safety Instructions

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with dry cloth.

7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type plug. 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 are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.

10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.

13. Unplug this apparatus during lightning storms or when unused for long periods of time.

14. 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.

15. Damage Requiring Service
    Unplug the apparatus from the wall outlet and refer servicing to qualified service personnel under the following conditions:

    • When the power-supply cord or plug is damaged,
    • liquid has been spilled, or objects have fallen into the apparatus,
    • If the apparatus has been exposed to rain or water,
    • If the apparatus does not operate normally by following the operating instructions. Adjust only those controls that are covered by the operating instructions as an improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the apparatus to its normal operation,
    • If the apparatus has been dropped or damaged in any way, and the apparatus exhibits a distinct change in performance this indicates a need for service.16. Object and Liquid Entry
    • Never push objects of any kind into the apparatus through openings as they may touch dangerous voltage points or short-out parts that could result in a fire or electric shock.

16. The apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such as vases shall be placed on the apparatus.
    Don’t put candles or other burning objects on top of this unit.

17.  Batteries
    Always consider the environmental issues and follow local regulations when disposing of batteries.

18. If you install the apparatus in a built-in installation, such as a bookcase or rack, ensure that there is adequate ventilation.
    (Leave 20 cm (8″) of free space at the top and sides and 10 cm (4″) at the rear. When a shelf is located above the unit, the rear edge of the shelf shall be set 10 cm (“) away from the backboard to improve ventilation.)

Precautions

1. Recording Copyright—Unless it’s for personal use only, recording copyrighted material is illegal without the permission of the copyright holder.

2. AC Fuse—The AC fuse inside the unit is not user serviceable. If you cannot turn on the unit, contact the dealer from whom you purchased this unit.

3. Care Occasionally you should dust the unit all over with a soft cloth. For stubborn stains, use a soft cloth dampened with a weak solution of mild detergent and water. Dry the unit immediately afterwards with a clean cloth. Don’t use abrasive cloths, thinners, alcohol, or other chemical solvents, because they may damage the finish or remove the panel lettering.

4. Power
   WARNING
   BEFORE PLUGGING IN THE UNIT FOR THE FIRST TIME, READ THE FOLLOWING SECTION CAREFULLY.
   AC outlet voltages vary from country to country. Make sure that the voltage in your area meets the voltage requirements printed on the unit’s rear panel (e.g., AC 230 V, 50 Hz or AC 120 V, 60 Hz).
   The power cord plug is used to disconnect this unit from the AC power source. Make sure that the plug is readily operable (easily accessible) at all times.
   For models with [POWER] button, or with both
   [POWER] and [ 8ON/STANDBY] buttons: Pressing the [POWER] button to select OFF mode does not fully disconnect from the mains. If you do not intend to use the unit for an extended period, remove the power cord from the AC outlet.
   For models with [ 8ON/STANDBY] button only: Pressing the [ 8ON/STANDBY ] button to select Standby mode does not fully disconnect from the mains. If you do not intend to use the unit for an extended period, remove the power cord from the AC outlet.

5. Preventing Hearing Loss
   Caution
   Excessive sound pressure from earphones and headphones can cause hearing loss.

6. Batteries and Heat Exposure
   Warning
   Batteries (battery pack or batteries installed) shall not be exposed to excessive heat as sunshine, fire or the like.

7. Never Touch this Unit with Wet Hands—Never handle this unit or its power cord while your hands are wet or damp. If water or any other liquid gets inside this unit, have it checked by the dealer from whom you purchased this unit.

8. Handling Notes

   • If you need to transport this unit, use the original packaging to pack it how it was when you originally bought it.
   • Do not leave rubber or plastic items on this unit for a long time, because they may leave marks on the case.
   •  This unit’s top and rear panels may get warm after prolonged use. This is normal.
   • If you do not use this unit for a long time, it may not work properly the next time you turn it on, so be sure to use it occasionally.

For U.S. models
FCC Information for User
CAUTION:
The user changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
NOTE:
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.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• 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.
•  Consult the dealer or an experienced radio/TV technician for help.

Supplied Accessories

Power cord

Power cord (5.9 ft/1.8 m) . . . . . . . . . . . . . . . . . . . . . . . (1)
(Plug type varies from country to country.)

• In catalogs and on packaging, the letter at the end of the product name indicates the color. Specifications and operations are the same regardless of color

Features

ADM-20.4 Power Amplifier

• 75 W/ch (1kHz, 8 ohms, 0.08% THD, 2ch Driven FTC)
• WRAT (Wide Range Amplifier Technology)
• High Current Low Impedance Drive
• 10,000 µF Capacitor x 2
• Three Stage Inverted Darlington Circuitry
• Copper Bus Plate for Low Impedance Drive
• 1/16″(16mm) Full-flat Chassis
• Aluminum Front Panels
• 12V Trigger in/out
• Impedance Switch (4 ~ 8 ohms and 8 ~ 16 ohms)
• Auto Power-on Function by Receiving Audio Signal
• Auto Standby Funct
• Compatible with IRK-120-3A

Installing the Power Amplifier

Install the power amplifier on a sturdy rack or shelf. Position it so that its weight is evenly dispersed on its four legs. Do not install the power amplifier in a place with vibration or an unstable location.
The power amplifier is designed to have high conversion efficiency, however, its temperature will become much higher than other audio equipment. Therefore, make sure not to hamper heat dissipation by ensuring proper ventilation.

Getting to Know the Power Amplifier

Front Panel

1. For detailed information, see the pages in parentheses.
   • 8ON/STANDBY button This button is used to turn the main power on/off.
2. Power indicator
   • The power indicator will be lit blue when the main power of ADM-20.4 is turned on.

Rear Panel

1. INPUT LEVEL knob
   Turn this INPUT LEVEL knob to adjust the input level of the signal from the INPUT jacks. Normally, set to MAX.

2. INPUT/OUTPUT jacks
   These are the analog audio inputs and outputs. Use an RCA-type audio connection cable to connect the output jacks of the device to the INPUT jacks on the ADM-20.4. When connecting a control amplifier or preamplifier, connect the PRE OUT jacks to the INPUT jacks.
   If you connect the OUTPUT jacks of the ADM-20.4 to the INPUT jacks of another ADM-20.4, the signal input at the INPUT jacks of the ADM-20.4 is also output from the OUTPUT jacks (Input/output Link Function).

3. 12V TRIGGER IN/OUT jacks
   Connect the 12V TRIGGER IN jack to an AV Receiver that has a 12V TRIGGER output jack. This jack works on between 5 to 12 volts DC.
   If you want another component to be activated/deactivated by turning on/off the AV receiver connected to the 12V TRIGGER IN jack of the ADM-20.4, connect the 12V TRIGGER input jack of that component to the 12V TRIGGER OUT jack of the ADM-20.4. In this state, the 12V TRIGGER is output when the ADM-20.4 is turned on.
   Devices can be connected in series using these jacks. Use 1/8-inch (3.5mm) monaural-type mini-jack connectors or the supplied stereo mini-plug cable. The tip polarity of the connector is positive.

4. SPEAKERS terminals
   Connect Speakers.

5. TRIGGER selector
   Set this TRIGGER switch before turning on the ADM-20.4.
   To turn on the ADM-20.4 with the signal input from the 12V TRIGGER IN jack, set the TRIGGER switch to 12V TRIGGER.
   To turn on the ADM-20.4 with the signal input from the INPUT jack, set the TRIGGER switch to AUDIO (Auto Power On Function). If you do not use Auto Power On Function, set the TRIGGER switch to OFF.

6. AUTO STANDBY selector
   Enables or disables the Auto standby function.

7. SPEAKER IMPEDANCE selector
   Switches the speaker impedance to 4  or 8 .

8. AC INLET

Connections

Cable and Jacks

Note

• Push plugs in all the way to make good connections (loose connections can cause noise or malfunctions).
• To prevent interference, keep audio cables away from power cords and speaker cables

Connecting the AV Receiver

When connecting the ADM-20.4 to AV Receiver, connect the INPUT jacks of the ADM-20.4 to the PRE OUT jacks of the AV Receiver, and connect the front speakers to the SPEAKERS terminals of the ADM-20.4.

Connecting Your Speakers

Screw-type speaker terminals
Strip 1/2″ to 5/8″ (12 to 15 mm) of insulation from the ends of the speaker cables, and twist the bare wires tightly, as shown.
1/2″ to 5/8″ (12 to 15 mm)

Banana Plugs

• If you are using banana plugs, tighten the speaker terminal before inserting the banana plug.
• Do not insert the speaker code directly into the center hole of the speaker terminal.

Note

• Pay close attention to speaker wiring polarity. In other words, connect positive (+) terminals only to positive (+) terminals, and negative (terminals only to negative (–) terminals. If you get them the wrong way around, the sound will be out of phase and will feel unnatural.

• Be careful not to short the positive and negative wires. Doing so may damage the power amplifier.

• Make sure the metal core of the wire does not have contact with the power amplifier’s rear panel. Doing so may damage the power amplifier.

• Don’t connect more than one speaker wire to a single speaker terminal. Doing so could damage the power amplifier or cause it to malfunction.

Connecting the Power Cord

1.  Connect all of your speakers and components.
2.  Connect the supplied power cord to the power
3. Plug the power cord into an AC wall outlet.

Tips

• To reduce noise, do not tie signal cables together with the power cable. Wire them so that they are away from each other.
• Depending on the country, the power amplifier may be polarity-sensitive. In this case, plug the power cord in a way that provides the best sound quality.

Note

• Never disconnect the power cord from the power amplifier while the other end is still plugged into a wall outlet. Doing so may cause an electric shock. Always disconnect the power cord from the wall outlet first, and then the power amplifier.
•  Turning on the power amplifier may cause a momentary power surge that might interfere with other electrical equipment on the same circuit. If this is a problem, plug the power amplifier into a different branch circuit.
• Do not use a power cord other than the one supplied with the power amplifier. The supplied power cord is designed exclusively for use with the power amplifier and should not be used with any other equipment.

Custom Setup

Setting the TRIGGER

Make TRIGGER selector settings if you want to turn the power on and off along with other equipment.

1. Switch the TRIGGER selector on the unit’s rear
   • [12V TRIGGER] The ADM-20.4 will be turned on when the 12V TRIGGER jacks are provided with power.
     [AUDIO] The ADM-20.4 will be turned on when the INPUT jacks are provided with an audio signa

Note:

The power will not be turned off automatically if the TRIGGER selector is set to AUDIO. Use the Auto Standby function if you want to turn off the power automatically.

[OFF] (default)
Set the TRIGGER selector to OFF if you want to turn the ADM-20.4 on or off independently from other equipment.

Setting the Auto Standby Function

When the Auto Standby (ASb) function is activated, the power amplifier will automatically enter Standby mode if there is no operation for 3 hours with no audio signal input.

1. Switch the AUTO STANDBY selector on the unit’s rear panel.
   •  [ON] Enables auto standby.
   •  [OFF] (default) Disables auto standby.

Setting the Speaker Impedance

You can set the impedance of the speakers that you connect to the unit.

1 Switch the SPEAKER IMPEDANCE selector on the unit’s rear pane

• [4  or more and less than 8 ] Sets the impedance to 4 .
•  [8  or more and 16  or less] Sets the impedance to 8 . (default)

Caution

• Settings will not be enabled even when the selector is changed in the Standby mode.
  To change a setting, be sure to turn on the unit prior to making any changes.

Operations

To listen to music or view your favorite movies, follow the operations below.
The procedures given below assume that the other system components are already connected. (For example, that the source components are already connected to the control amplifier or the preamplifier.)

1. Lower the volume at the control amplifier or preamplifier.
   Lower the volume of the control amplifier or preamplifier to the minimum so that when the ADM-20.4 is turned on, you do not hear loud unwanted sounds.

2. Turn on the ADM-20.4 and select the input on the control amplifier or preamplifier.
   Select the proper input on the control amplifier or preamplifier.

3. Slowly increase the volume of the control amplifier or preamplifier.
   Now all that remains is to control the control amplifier or preamplifier and the other connected system components to enjoy your music or movies.

Troubleshooting

The Standby/On indicator does not light when the ON/STANDBY button is pressed.

•  Bad connections or wiring.
  • Check if the power cord is properly connected. If the indicator still does not light, turn off the ADM-20.4, disconnect the power cord, and contact the dealer from whom you purchased this unit.

T he Power indicator lights blue, but no sound comes from the speaker or the volume is very low.

• Bad connections or wiring.
• Check connections, speaker cables, etc.
• The INPUT LEVEL control is set to MIN.
• Turn the INPUT LEVEL control to adjust the input level.
• The settings on the control amplifier or preamplifier are wrong.
• Check the settings on the control amplifier or preamplifier.

The left and right sounds are unbalanced or reversed.

• Bad connections or wiring.
• Check connections, RCA-type audio connection cable, etc.
• The polarity of the speaker cable is wrong.
• Check the polarity of the speaker cable.

The TRIGGER switch does not react.

• Check that the TRIGGER switch is effective.
• Turn on the power supply once.

Specifications

Rated Output Power

(FTC) 75 watts minimum continuous power per channel, 8 ohm loads, 2 channels driven at 1 kHz, with a maximum total harmonic distortion of 0.08 %
(FTC) 65 watts minimum continuous power per channel, 4 ohm loads, 2 channels driven at 1 kHz, with a maximum total harmonic distortion of 0.08 %

THD+N (Total Harmonic Distortion)

0.08 % (Rated Output Power) 60 (Front, 1 kHz, 8 )

Damping Factor

Input Sensitivity and Impedance (Unbalance)
870 mV/20 k (INPUT)
Rated RCA Output Level and Impedance

• Frequency Response 0.87 V/270  (OUTPUT)
• Signal to Noise Ratio 10 Hz – 100 kHz/+0 dB, –3 dB (INPUT)
• Speaker Impedance 110 dB (INPUT, IHF-A)
• Power Supply  4  – 16 
• Power Consumption AC 120 V, 60 Hz

No-sound Power Consumption 45 W
Stand-by Power Consumption

Dimensions (W × H × D)

Weight 0.5 W
435 mm × 139 mm × 317 mm 17-1/8″ × 5-1/2″ × 12-1/2″
8.0 kg (17.6 lbs)

Specifications and features are subject to change without notice.

Integra Division of
18 park Way, Upper Saddle River, N.J. 07458, U.S.A.
Tel: 201-818-9200 Fax: 201-785-2650 http://www.integrahometheater.com

Advanced Features

• 75 Watts per Channel at 8 Ohms, 1 kHz, 0.08% THD, 2 Channels Driven, FTC
• WRAT (Wide Range Amplifier Technology)
• Three-Stage Inverted Darlington Circuitry to Reduce Distortion
• All Discrete Output Stage Circuitry
• Heavy Duty EI Transformer
• Two Large 10,000 μF Capacitors for Effective Power Supply
• Low-Impedance Copper Bus Bars for Perfect Ground Potential
• High-Current, Low-Impedance Drive
• Flat, High-Rigidity, 1/16” (1.6 mm) Anti-Resonant Chassis
• Multi-Zone Audio Capability with Line-In and Line-Out

Other Features

• 12 V Trigger Input and Output with Audio Switch
• Banana Plug-Compatible, Color-Coded Speaker Posts
• Input Level Adjustment on Rear Panel
• Auto Standby On/Off Switch
• Aluminum Front Panel with Power Light
• Impedance Selector Switch (4-8 Ohms and 8-16 Ohms)
• Optional Rack Mount Kit Available IRK-130-3B

Three-Stage Inverted Darlington Circuitry

An important upgrade to the core WRAT concept is Integra’s Three-Stage Inverted Darlington Circuitry, a low negative feedback topology featuring a discrete triple transistor array to cut distortion and boost current fl ow to the speakers. As well as improving efficiency, transient response, and audio clarity, discrete transistors run cooler, extending the life of your output stage for more years of trouble-free service.
All-Analog Circuitry Delivers Ultra-Clear Sound

A standard integrated amplifier has the dual task of both processing and amplifying audio signals, and is therefore susceptible to interference from digital circuitry. As a dedicated power amp with all-analog circuitry, the ADM-20.4 is protected against digital interference. When partnered with a quality pre-processor, this unit offers all the benefits of pure analog amplification: a warm, musical, and full-bodied sound.
High Output Power Supply

From input to output, signal purity is maintained at every stage. Housed in a rigid anti-resonant steel-plate chassis and finished with a tough one-piece aluminum front panel, the ADM-20.4 is highly resistant to vibration. A massive EI transformer delivers a steady supply of power to the speakers, while two large 10,000 μF capacitors, heavy-duty transistors, and low-impedance copper bus bars work in concert to enhance the power and fidelity of your audio sources. A heavy-duty aluminum heat sink keeps the unit running cool for superior reliability and longer life.
User-Friendly Features and Better Performance

The ADM-20.4 sports banana plug-compatible speaker posts to ensure a positive connection to the loudspeakers of your choice. The unit is also equipped with selectable audio or 12 V triggers—providing automatic power on/off with your home theater system—plus a rear side level adjustment. A pair of line-in and line-out ports provide the multi-room capabilities to which this amplifier is perfectly suited.

Specifications
Amplifier Section
Power Output:

75 W/Ch at 8 Ohms, 1 kHz, 0.08%, 2 Channels Driven, FTC
65 W/Ch at 4 Ohms, 1 kHz, 0.08%, 2 Channels Driven, FTC

THD (Total Harmonic Distortion): 0.08% (Rated Power)
Damping Factor: 60 (Front, 1 kHz, 8 Ohms)
Input Sensitivity and Impedance: 870 mV/20 k-Ohms (Unbalanced)

Rated RCA Output Level and Impedance :  0.87 V/270 Ohms (Line Out)

Frequency Response: 10 Hz–100 kHz/+0 dB, -3 dB

Signal-to-Noise Ratio:  -3 dB 110 dB (Line, IHF-A)
Speaker Impedance:  4 Ohms–16 Ohms

Power Supply: AC 120 V~, 60 Hz

Power Consumption: 16W

No-Sound Power Consumption: 45 W Standby Power Consumption: 0.5 W

Dimensions (W x H x D):

• Weight: 17 1/8˝ x 5 1/2˝ x 12 1/4˝ (435 x 139 x 317.3 mm)
  17.6 lbs. (8.0 kg

• Carton
  Dimensions (W x H x D):

• Weight: 22 1/2˝ x 10 3/8˝ x 16 1/2˝ (572 x 264 x 419 mm)
  21.6 lbs. (9.8 kg)

References

• Integra Home Theater - Integra Home Theater

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