Setting the unit What’s what GM-D8701 Front side 1 2 34 Rear side GM-D9701 Front side 1 2 34 ! 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. ! If you hear too much noise when using the speaker input terminals, turn the gain control to higher level. 3 LPF (low-pass filter) cut off frequency control You can select a cut off frequency from 40 Hz to 240 Hz. 4 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. For instruction of connecting the bass boost remote control to the amplifier, see the Connection diagram. Rear side To adjust the switch, use a flathead screwdriver if needed. 1 POWER/PROTECT indicator The power indicator lights up to indicate power ON. ! If something is not normal, the indicator turns red. 2 GAIN (gain) control 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. 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. En Setting the unit Connecting the units ! 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) Connection diagram 2 3 5 a 7 6 4 8 9 b c Preout level: 4 V Above illustration shows NORMAL gain setting. Relationship between amplifier gain and head unit output power 1 e d h i j 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. f g 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 amplifier, connect the battery wire terminal of the amplifier to the positive + terminal of the battery. 2 Fuse 100 A (GM-D8701) / 150 A (GM-D9701) (sold separately) Each amplifier must be separately fused at 100 A (GM-D8701) / 150 A (GM-D9701). 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. En Connecting the units 7 Car stereo with RCA output jacks (sold separately) 8 External output 9 Connecting wire with RCA pin plugs (sold se- parately) a Amplifier with RCA input jacks (sold sepa- rately) b Bass boost level remote control c Bass boost level remote control wire (5 m) d RCA input jack e RCA output jack 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 Speaker output terminals Please see the following section for speaker connection instructions. Refer to Connections when using the speaker input wire. h Fuse 40 A × 2 (GM-D8701) / 40 A × 3 (GMD9701) i Front side j Rear side 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. ! 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. Connecting the speakers This amplifier can be connected to two speakers in parallel. Connect the speaker leads to suit the mode according to the figure shown below. Precautions for parallel connection ! When wiring two speakers in parallel, make sure that the synthetic impedance is from 1 W to 8 W to prevent the amplifier from catching fire, generating smoke and/or being damaged. ! When connected in parallel with the synthetic impedance less than 1 W, as a normal function, this amplifier may automatically be set on mute if outputting high volume sound. Turn down the volume until the mute function is canceled. En Connecting the units When connecting to one speaker 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. Speaker output When connecting to two speakers The output from two speakers is the same as that of one speaker. Speaker output 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. En
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