Setting the unit What’s what GM-D8704 Front side 2 5 4 3 1 Rear side GM-D9704 Front side 2 5 4 3 1 Rear side To adjust the switch, use a flathead screwdriver if needed. 1 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. 2 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. 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. If the 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 INPUT SELECT (input select) switch Select 2CH for two-channel input and 4CH for four–channel input. 5 POWER/PROTECT indicator The power indicator lights up to indicate power ON. ! If something is not normal, the indicator turns red. En Setting the unit 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 Preout level: 2 V (Standard: 500 mV) 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 If the signal waveform is distorted due to high output, even if the amplifier gain is raised, the output power will change only slightly. Preout level: 4 V Above illustration shows NORMAL gain setting. Relationship between amplifier gain and head unit output power En Connecting the units Connection diagram 7 23 5 8 6 4 9 1 d ab h c i g f e 1 Battery wire (sold separately) ! The maximum length of the wire between the fuse and the positive + terminal of the battery is 30 cm. ! 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 am- plifier, connect the battery wire terminal of the amplifier to the positive + terminal of the battery. 2 Fuse 80 A (GM-D8704) / 100 A (GM-D9704) (sold separately) Each amplifier must be separately fused at 80 A (GM-D8704) / 100 A (GM-D9704). 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) a RCA input jack A b RCA input jack B c Amplifier with RCA input jacks (sold separately) d RCA output jack Outputs the signal input to CH A. e Speaker output terminals Please see the following section for speaker connection instructions. Refer to Connections when using the speaker input wire. f 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. g Fuse 30 A × 2 (GM-D8704) / 40 A × 2 (GMD9704) h Front side i Rear side 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 adhe- sive tape. To protect the wiring, wrap sections in contact with metal parts in adhesive tape. En Connecting the units ! 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 nega- tive cables. ! If the system remote control wire of the ampli- fier 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 W (or lower) bridged mode (Diagram B). Amplifier damage, smoke, and overheating could result from improper bridging. The am- plifier 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 2 W 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, or 4 W to 8 W for two-channel and other bridge connections. Subwoofer Speaker channel Four-channel output Two-channel output Three-channel Speaker output A Three-channel Speaker output B Power Nominal input: Min. 100 W (GM-D8704) Min. 130 W (GM-D9704) Nominal input: Min. 300 W (GM-D8704) Min. 400 W (GM-D9704) Nominal input: Min. 100 W (GM-D8704) Min. 130 W (GM-D9704) Nominal input: Min. 300 W (GM-D8704) Min. 400 W (GM-D9704) En
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