Pioneer GM-D8704 Bridgeable Four-Channel Power Amplifier Owner’s Manual

Pioneer GM-D8704 Bridgeable Four-Channel Power Amplifier Owner’s Manual

Before you start

Thank you for purchasing this PIONEER product

To  ensure proper use please this through  this manual before  this product It is especially  important that you read and observe WARNINGs and CAUTIONs read this  manual  Please keep  the  manual in safe and accessible  Place for future refernce

Information to User

Alteration or modifications carried out without appropriate authorization may invalidate the user’s right 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.

FEDERAL COMMUNICATIONS COMMISSION SUPPLIER’S DECLARATION OF CONFORMITY Product Name: Bridgeable Four-Channel Power Amplifier Model Number: GM-D8704/GM-DX874 Responsible Party Name: PIONEER ELECTRONICS (USA) INC. SERVICE SUPPORT DIVISION
Address: 2050 W. 190TH STREET, SUITE 100,
TORRANCE, CA 90504, U.S.A.
Phone: 1-800-421-1404
URL: https://www.pioneerelectronics.com/PUSA/

After-sales service for Pioneer products

Please contact the dealer or distributor from where you purchased this unit for after-sales service (including warranty conditions) or any other information. In case the necessary information is not available, please contact the companies listed below: Please do not ship your unit to the companies at the addresses listed below for repair without advance  contact

USA & CANADA

Pioneer Electronics (USA) Inc.
CUSTOMER SUPPORT DIVISION
P.O. Box 1760
Long Beach, CA 90801-1760
800-421-1404

sound, so what sounds “normal” can actually be loud and harmful to your hearing

If you experience problems

Should this product fail to operate properly, please contact your dealer or nearest authorized Pioneer Service Station

Visit our website

http://www.pioneerelectronics.com
in Canada
http://www.pioneerelectronics.ca

• Learn about product updates (such as firmware updates) for your product.
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The Safety of Your Ears is in Your Hands

Get the most out of your equipment by playing it at a safe level—a level that lets the sound come through clearly without annoying blaring or distortion and, most importantly,  without affecting your sensitive hearing. Soundcan be deceiving. Over time, your hearing “comfort level” adapts to higher volumes of sound, so what sounds “normal” can actually be loud and harmful to your hearing. Guard against this by setting your equipment at a safe level BEFORE your hearing adapts

ESTABLISH A SAFE LEVEL

• Set your volume control at a low setting.
• Slowly increase the sound until you can hear it comfortably and clearly, without distortion.
• Once you have established a comfortable sound level, set the dial and leave it there

BE SURE TO OBSERVE THE FOLLOWING GUIDELINES

• Do not turn up the volume so high that you can’t hear what’s around you.
• Use caution or temporarily discontinue use in potentially hazardous situations.
• Do not use headphones while operating a motorized vehicle; the use of headphones may create a traffic hazard and is illegal in many areas

Before connecting/ iMRS@KKiMF SGD @LOKifiDQ

WARNING

• This product contains chemicals known to the State of California and other governmental entities tocause cancer and birth defects or other reproductive harm. Wash hands after handling.
• Slots and openings in the cabinet are provided for ventilation to ensure reliable operation of the product, and to protect it from overheating. To prevent fire hazard, the openings should never be blocked or covered with items (such as papers, floor mat, cloths).
• This unit is for vehicles with a 12 V battery and negative grounding. Before installing in recreational vehicles, trucks or buses, check the battery voltage.
• When installing this unit, make sure to connect the ground wire first. Ensure that the ground wire is properly connected to the metal parts of the car’s body. The ground wire of the one of this unit must be connected to the car separately with different screws. If the screw for the ground wire loosens or falls out, it could result in fire, generation of smoke or malfunction.
• Be sure to install the fuse to the battery wire.
• Always use a fuse of the rating prescribed. The use of an improper fuse could result in overheating and smoke, damage to the product, and injury, including burns.
• Check the connections of the power supply and speakers if the fuse of the separately sold battery wire or the amplifier fuse blows. Determine and resolve the cause, then replace the fuse with and identical equivalent.
• Always install the amplifier on a flat surface. Do not install the amplifier on a surface that is not flat or on a surface with a protrusion. Doing so could result in malfunction.
• When installing the amplifier, do not allow parts such as extra screws to get caught between the amplifier and the automobile. Doing so could cause malfunction.
• Do not allow this unit to come into contact with liquids. Electrical shock could result. Also, damage to this unit, smoke, and overheating could result from contact with liquids. The surfaces of the amplifier and any attached speakers may also heat up and cause minor burns.
• In the event of any abnormality, the power supply to the amplifier is cut off to prevent equipment malfunction. If this occurs, switch the system power off and check the power supply and speaker connections. If you are unable to determine the cause, please contact your dealer
• Always disconnect the negative ② terminal of the battery beforehand to avoid the risk of electric shock or short circuit during installation.
• Do not attempt to disassemble or modify this unit. Doing so may result in fire, electric shock or other malfunction

CAUTION

• Always keep the volume low enough to hear outside sounds.
• Extended use of the car stereo while the engine is at rest or idling may exhaust the battery.
• This product is evaluated in moderate and tropical climate condition under the Audio, video and similar electronic apparatus – Safety requirements, IEC 60065.
• The graphical symbol placed on the product means direct current.

About the protection function

This product has protection function. When this product detects something abnormal, the following functions will operate to protect the product and speaker output.

• The POWER/PROTECT indicator will turn red and the amplifier will shut down in the situations outlined below.
  • If the temperature inside the amplifier gets too high.
  • If a DC voltage is applied to the speaker output terminal.
• The POWER/PROTECT indicator will turn red and the output will be muted in the situations outlined below.
  • If the speaker output terminal and speaker wire are short-circuited.

Important (Serial number)

The serial number is located on the bottom of this unit. For your own security and convenience, be sure to record this number on the enclosed warranty card.

SETTING THE UNIT

What’s what

Front side

Rear side

To adjust the switch, use a flathead screwdriver if needed.

1. BASS BOOST REMOTE (bass boost level remote control) jack By connecting the Bass boost level remote control to the jack on the main unit, you will be able to select a bass boost level from 0 dB to 18 dB.
   • Bass boost level setting applies only to CHANNEL B (channel B) output.
   • For instruction of connecting the bass boost remote control to the amplifier, see the Connection diagram.
2. FREQ (cut off frequency) control Cut off frequency selectable from 40 Hz to 500 Hz if the LPF/HPF select switch is set to LPF or HPF.
3. GAIN (gain) control Adjusting gain controls CHANNEL A (channel A) and CHANNEL B (channel B) helps  align the car stereo output to the Pioneer amplifier. Default setting is the NORMAL  position. he output remains low, even when the car stereo volume is turned up, turn the controls to a lower level. If distortion occurs when the car stereo volume is turned up, turn these controls to a higher level.
   • If using only one input plug, set the gain controls for speaker outputs A and B to the same position.
   • For use with an RCA equipped car stereo (standard output of 500 mV), set to the NORMAL position. For use with an RCA equipped Pioneer car stereo, with maximum output of 4 V or more, adjust level to match that of the car stereo output.
   • For use with an RCA equipped car stereo with output of 4 V, set to the H position.
4. LPF (low-pass filter)/HPF (high-pass filter) select switch Switch the settings based on the connected speaker.
   • When the Subwoofer is connected: Select LPF. This eliminates high range frequency and outputs low range frequency.
   • When the full range speaker is connected: Select HPF or OFF. HPF eliminates low range frequency and output high range frequency. OFF outputs the entire frequency range.
5. INPUT SELECT (input select) switch Select 2CH for two-channel input and 4CH for four–channel input.
6. POWER/PROTECT indicator The power indicator lights up to indicate power ON.
   • If something is not normal, the indicator turns red

Setting gain properly

Protective function included to prevent malfunction of the unit and/or speakers

• due to excessive output, improper use or improper connection.
• When outputting high volume sound etc., this function cuts off the output for a few seconds as a normal function, but output is restored when the volume of the head unit is turned down.
• A cut in sound output may indicate improper setting of the gain control. To ensure continuous sound output with the head unit at a high volume, set amplifier gain control to a level appropriate for the preout maximum output level of the head unit, so that volume can remain unchanged and to control excess output.
• Despite correct volume and gain settings, the unit sound still cuts out periodically. In such cases, please contact the nearest authorized Pioneer Service Station.

Gain control of this unit

Above illustration shows NORMAL gain setting.

Relationship between amplifier gain and head unit output power

If amplifier gain is raised improperly, this will simply increase distortion, with little increase in power. Signal waveform when outputting at high volume using amplifier gain control

signal waveform is distorted due to high  output, even if the amplifier gain is raised, the output power will change only slightly

CONNECTING THE UNITS

Connection diagram

1. Battery wire (sold separately)
   • The maximum length of the wire between the fuse and the positive + terminal of the battery is 30 cm (12 in.).
   • For the wire size, refer to Connecting the power terminal. The battery wire, the ground wire and the optional direct ground wire must be same size. After making all other connections at the amplifier, connect the battery wire terminal of the amplifier to the positive + terminal of the battery.
2. Fuse (80 A) (sold separately) Each amplifier must be separately fused at  80 A.
3. Positive + terminal
4. Negative (*) terminal
5. Battery (sold separately)
6. Ground wire, Terminal (sold separately) The ground wires must be same size as the battery wire. Connect to metal body or chassis.
7. Car stereo with RCA output jacks (sold separately)
8. External output If only one input plug is used, do not connect anything to RCA input jack B.
9. Connecting wire with RCA pin plugs (sold separately)
   • RCA input jack A
   • RCA input jack B
   • Amplifier with RCA input jacks (sold separately)
   • RCA output jack Outputs the signal input to CH A.
   • Speaker output terminals Please see the following section for speaker connection instructions. Refer to Connections when using the speaker input wire.
   • System remote control wire (sold separately) Connect male terminal of this wire to the system remote control terminal of the car stereo. The female terminal can be connected to the auto-antenna relay control terminal. If the car stereo lacks a system remote control terminal, connect the male terminal to the power terminal via the ignition switch.
   • Fuse (30 A) × 2
   • Front side
   • Rear side
   • Bass boost level remote control wire (5 m)
   • Bass boost level remote control
     Note INPUT SELECT (input select) switch must be set. For details, see Setting the unit.

Before connecting the amplifier

WARNING

• Secure the wiring with cable clamps or adhesive tape. To protect the wiring, wrap sections in contact with metal parts in adhesive tape.
• Never cut the insulation of the power supply to feed power to other equipment. Current capacity of the wire is limited.

CAUTION

• Never shorten any wires, the protection circuit may malfunction.
• Never wire the speaker negative cable directly to ground.
• Never band together multiple speaker’s negative cables.
• If the system remote control wire of the amplifier is connected to the power terminal via the ignition switch (12 V DC), the amplifier will remain on with the ignition whether the car stereo is on or off, which may exhaust battery if the engine is at rest or idling.
• Install and route the separately sold battery wire as far as possible from the speaker wires. Install and route the separately sold battery wire, ground wire, speaker wires and the amplifier as far away as possible from the antenna, antenna cable and tuner.

About bridged mode

• Do not install or use this amplifier by wiring speakers rated at 2 W (or lower) in parallel to achieve a 1  (or lower) bridged mode (Diagram B). Amplifier damage, smoke, and overheating could result from improper bridging. The amplifier surface could also become hot to the touch and minor burns could result. To properly install or use a bridged mode and achieve a 2 W load, wire two 4 W speakers in parallel with Left + and Right * (Diagram A) or use a single 2W speaker. In addition, refer to the speaker instruction manual for information on the correct connection procedure.
• For any further enquiries, contact your local authorized Pioneer dealer or customer service.

About suitable specification of speaker

Ensure speakers conform to the following standards, otherwise there is a risk of fire, smoke or damage. Speaker impedance is 2 W to 8 W, or4 W to 8 W for two-channel and other bridge connections.

Subwoofer

Two-channel output

| Nominal input: Min. 300 W
Three-channel output| Speaker output A| Nominal input: Min. 100 W
Speaker output B| Nominal input: Min. 300 W

Other than subwoofer

Connecting the speakers

The speaker output mode can be four-channel, three-channel (stereo and mono) or two-channel (stereo or mono). Connect the speaker leads based on the mode and the figures shown below.

Four-channel output

1. Left
2. Right
3. Speaker output A
4. Speaker output B

Two-channel output (Stereo)

1. Speaker output (Right)
2. Speaker output (Left)

Two-channel output (Mono)

1. Speaker output (Mono)

Three-channel output

1. Left
2. Right
3. Speaker output A
4. Speaker output B (Mono)

Connections when using the RCA input jack

Connect the car stereo RCA output jack and the RCA input jack of the amplifier.

• The RCA output jack of this unit outputs the signal that comes from The RCA input jack A.

Four-channel / Three-channel output

• Slide INPUT SELECT (input select) switch to 4CH position.

1. RCA input jack A
2. RCA input jack B
3. Connecting wires with RCA plugs (sold separately)
4. From car stereo (RCA output) If only one input plug is used, e.g. when the car stereo has only one output (RCA output), connect the plug to RCA input jack A rather than B
5. INPUT SELECT (input select) switch (4CH position)

Two-channel output (Stereo) / (Mono) 4 ! Slide INPUT SELECT (input select) switch to 2CH position.

1. RCA input jack A For two-channel output, connect the RCA plugs to the RCA input jack A.
2. Connecting wire with RCA pin plugs (sold separately)
3. From car stereo (RCA output)
4. INPUT SELECT (input select) switch (2CH position)

Connections when using the speaker input wire

Connect the car stereo speaker output wires to the amplifier using the supplied speaker input wire with RCA pin cord.

1. Car Stereo
2. Speaker output
3. Red: Right +
4. Black: Right *
5. Black: Left *
6. White: Left +
7. Speaker input wire with RCA pin cord To the RCA input jack of this unit

Notes

• If speaker input wires from a headunit are connected to this amplifier, the amplifier will automatically turn on when the headunit is turned on. When the headunit is turned off, the amplifier turns off automatically. This function may not work with some headunits. In such cases, please use a system remote control wire (sold separately). If multiple amplifiers are to be connected together synchronously, connect the head unit and all amplifiers via the system remote control wire.
• Connect the system remote control wire when you wish to only turn on the car stereo, not the amplifier.
• This amplifier automatically selects an input signal mode between the RCA level and the speaker level by detecting an input signal.

Solderless terminal connections

• Since the wire will become loose over time, it must be periodically inspected and tightened as necessary.
• Do not solder or bind the ends of the twisted wires.
• Fasten while making sure to not to clamp the insulating sheath of the wire.
• Use the supplied hexagonal wrench to tighten and loosen the terminal screw of the amplifier and use it to securely fasten the wire. Be careful to avoid excessive tightening of this screw, which may damage the wire.

Connecting the power terminal

WARNING

If the battery wire is not securely fixed to the terminal using the terminal screws, there is a risk of overheating, malfunction and injury, including minor burns.

• Always use the recommended battery and ground wire, which is sold separately. Connect the battery wire directly to the car battery positive (+) terminal and the ground wire to the car body.
• Recommended wires size (AWG: American Wire Gauge) is as follows. The battery wire, the ground wire and the optional direct ground wire must be same size.
• Use a wire of 8 AWG to 16 AWG wire for the speaker wire.

Battery wire and ground wire size

Route battery wire from engine compartment to the vehicle interior.

• When drilling a cable pass-hole into the vehicle body and routing a battery wire thorough it, take care not to short-circuit the wire damaging it by the cut edges or burrs of the hole.

After completing all other amplifier connections, finally connect the battery wire terminal of the amplifier to the positive + battery terminal.

1. Positive + terminal
2. Battery wire (sold separately) The maximum length of the wire between the fuse and the positive + terminal of the battery is 30 cm (12 in.).
3. Fuse (80 A) (sold separately) Each amplifier must be separately fused at 80 A

Use wire cutters or a utility knife to strip the end of the battery wire, ground wire and system remote control wire to expose about 10 mm (3/8 in.) of the end of each of the wires, and then twist the exposed ends of the wires.

Connect the wires to the terminal. Fix the wires securely with the terminal screws.

1. Battery wire
2. Power terminal
3. Ground wire
4. GND terminal
5. System remote control wire
6. System remote control terminal
7. Terminal screws

Connecting the speaker output terminals

Use wire cutters or a utility knife to strip the end of the speaker wires to expose about 10 mm (3/8 in.) of wire and then twist the wire.

Connect the speaker wires to the speaker output terminals.
Fix the wires securely with the terminal screws.

1. Terminal screws
2. Speaker wires
3. Speaker output terminals

INSTALLATION

Before installing the amplifier

WARNING

• To ensure proper installation, use the supplied parts in the manner specified. If any parts other than those supplied are used, they may damage internal parts of the amplifier, or become loose causing the amplifier to shut down.
• Do not install in:
  • Places where it could injure the driver or passengers if the vehicle stops suddenly.
  • Places where it may interfere with the driver, such as on the floor in front of the driver’s seat.
• Install tapping screws in such a way that the screw tip does not touch any wire. This is important to prevent wires from being cut by vibration of the car, which can result in fire.
• Make sure that wires do not get caught in the sliding mechanism of the seats or touch the legs of a person in the vehicle as short-circuit may result.
• When drilling to install the amplifier, always confirm no parts are behind the panel and protect all cables and important equipment (e.g. fuel/brake lines, wiring) from damage.

CAUTION

• To ensure proper heat dissipation of the amplifier, ensure the following during installation:
  • Allow adequate space above the amplifier for proper ventilation.
  • Do not cover the amplifier with a floor mat or carpet.
• Place all cables away from hot places, such as near the heater outlet.
• The optimal installation location differs depending on the car model. Secure the amplifier at a sufficiently rigid location.
• Check all connections and systems before final installation.
• After installing the amplifier, confirm that the spare tire, jack and tools can be easily removed

Attaching the Bass boost remote control

Attach with tapping screws (3 mm × 10 mm (1/8 in. × 3/8 in.)) at an easily accessible location such as under the dashboard.

Example of installation on the floor mat or chassis

1. Place the amplifier in the desired installation location. Insert the supplied tapping screws (4 mm × 18 mm (5/32 in. × 3/4 in.)) into the screw holes and push on the screws with a screwdriver so they make an imprint where the installation holes are to be located.
2. Drill 2.5 mm (3/32 in.) diameter holes at the imprints either on the carpet or directly on the chassis.
3. Install the amplifier with the use of supplied tapping screws (4 mm × 18 mm (5/32 in. × 3/4 in.)).

1. Tapping-screws (4mm × 18mm (5/32 in. × 3/4 in.))
2. Drill a 2.5 mm (3/32 in.) diameter hole.
3. Floor mat or chassis
4. Hole-to-hole distance: 229.5 mm (9-1/32 in.)
5. Hole-to-hole distance: 191.5 mm (7-17/32 in.)

ADDITIONAL INFORMATION

Specifications

• Power source: DC (10.8 V to 15.1 V allowable)

• Grounding system: Negative type

• Current consumption: 29 A (at continuous power, 4 W)

• Average current consumption: 3.1 A (4 W for four channels)
  4.4 A (4 W for two channels,
  BRIDGE)
  4.4 A (2 W for four channels)
  Fuse: 30 A × 2
  Dimensions (W × H × D) … 252 mm × 60 mm ×
  215 mm
  (9-7/8 in. × 2-3/8 in. ×
  8-1/2 in.)
  Weight:  2.5 kg (5.5 lbs)
  (Leads for wiring not included)

• Maximum power output: 200 W × 4 (4 W) / 600 W × 2
  (4 W) BRIDGE / TOTAL
  1 200 W (300 W × 4)

• Continuous power output: 100 W × 4 (at 14.4 V, 4 W,
  20 Hz to 20 kHz, ≦ 1 % THD)
  150 W × 4 (at 14.4 V, 2 W,
  1 kHz, ≦ 1% THD)
  125 W × 4 (at 14.4 V, 1 W,
  1 kHz, ≦ 1% THD)
  300 W × 2 (at 14.4 V, 4 W
  BRIDGE, 1 kHz, ≦ 1% THD)
  250 W × 2 (at 14.4 V, 2 W
  BRIDGE, 1 kHz, ≦ 1% THD)

• Load impedance: 4 W (1 W to 8 W allowable)

• Frequency response: 10 Hz to 50 kHz (+0 dB, –3 dB)

• Signal-to-noise ratio: 95 dB (IHF-A network)

• Distortion : 0.05 % (10 W, 1 kHz)
  Low pass filter:

• Cut off frequency : 40 Hz to 500 Hz

• Cut off slope: 12 dB/oct
  High pass filter:

• Cut off frequency: 40 Hz to 500 Hz

• Cut off slope: 12 dB/oct
  Bass boost:

• Frequency : 50 Hz

• Level: 0 dB to 18 dB
  Gain control:

• RCA : mV to 6.5 V

• Speaker: V to 16 V
  Maximum input level / impedance:
  RCA:  6.5 V / 25 kw

• Speaker: 16 V / 12 kW

**CEA2006 Specifications

**

• Power output: 100 W RMS × 4 Channels
  (at 14.4 V, 4 W and ≦ 1%
  THD+N)
  300 W RMS × 2 Channels
  (at 14.4 V, 4 W BRIDGE 1 kHz
  and ≦ 1 % THD+N)
  150 W RMS × 4 Channels
  (at 14.4 V, 2 W 1 kHz and ≦ 1% THD+N)

• S/N ratio: 75 dBA (reference: 1 W into 4 W)

GM-DX874

In order to listen to music with Hi-Res sound quality. all components complied with High-Resolution Audio Standard of Japan Audio Society are recommended to use.

The product with this logo is conformed to High-Resolution Audio standard defined by Japan Audio Society. This logo is used under license from Japan Audio Society.

Notes

• Specifications and the design are subject to modifications without notice.
• The average current consumption is nearly the maximum current consumption by this unit when an audio signal is input. Use this value when working out total current consumption by multiple power amplifiers.

CUSTOMER SUPPORT

Register your product at
Enregistrez votre produit au
Registre su producto en
http://www.pioneerelectronics.com
in Canada
au Canada http://www.pioneerelectronics.ca

en Canada

PIONEER ELECTRONICS (USA) INC.

P.O. Box 1540, Long Beach, California 90801-1540, U.S.A.
TEL: 800-421-1404

References

• Pioneer of Canada, Car Stereo, Speakers, Home Theater, GPS Navigation | Pioneer of Canada - English
• Pioneer USA, Car Audio, Speakers, Subs, Amps, In-Car Technology, Driver Assistance Products, and Optical Drives | Pioneer Electronics USA
• Pioneer USA, Car Audio, Speakers, Subs, Amps, In-Car Technology, Driver Assistance Products, and Optical Drives | Pioneer Electronics USA

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