Before Connecting The Amplifier - Pioneer GM-D8701 Owner's Manual

Setting the unit
What's what
when the car stereo volume is turned up,
turn these controls to a higher level.
GM-D8701
! For use with an RCA equipped car stereo
Front side (standard output of 500 mV), set to the
1 2 3 4 NORMAL position. For use with an RCA
equipped Pioneer car stereo, with maxi-
mum 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
Rear side 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
GM-D9701 40 Hz to 240 Hz.
Front side
4 BASS BOOST REMOTE (bass boost level
1 2 3 4
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 Con-
Rear side
nection diagram.
Setting gain properly
! Protective function included to prevent
To adjust the switch, use a flathead screwdri-
malfunction of the unit and/or speakers
ver if needed.
due to excessive output, improper use or
improper connection.
1 POWER/PROTECT indicator
! When outputting high volume sound etc.,
The power indicator lights up to indicate
this function cuts off the output for a few
power ON.
seconds as a normal function, but output
! If something is not normal, the indicator
is restored when the volume of the head
turns red.
unit is turned down.
2 GAIN (gain) control
If the output remains low, even when the car
stereo volume is turned up, turn the con-
trols to a lower level. If distortion occurs
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Setting the unit
! A cut in sound output may indicate impro-
Signal waveform when outputting at
per setting of the gain control. To ensure high volume using amplifier gain
continuous sound output with the head control
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
If the signal waveform is distorted due to high
authorized Pioneer Service Station.
output, even if the amplifier gain is raised, the
output power will change only slightly.
Gain control of this unit
Preout level: 2 V (Standard: 500 mV)
Preout level: 4 V
Above illustration shows NORMAL gain set-
ting.
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.
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Connecting the units
Connection diagram
7 Car stereo with RCA output jacks (sold sepa-
rately)
8 External output
7
9 Connecting wire with RCA pin plugs (sold se-
2 3 6
parately)
8
4
a Amplifier with RCA input jacks (sold sepa-
rately)
5
b
b Bass boost level remote control
9
c
c Bass boost level remote control wire (5 m)
d RCA input jack
a
e RCA output jack
f System remote control wire (sold separately)
Connect male terminal of this wire to the sys-
tem remote control terminal of the car stereo.
1
The female terminal can be connected to the
e d
auto-antenna relay control terminal. If the car
i
h
stereo lacks a system remote control terminal,
j
connect the male terminal to the power term-
inal via the ignition switch.
g Speaker output terminals
Please see the following section for speaker
connection instructions. Refer to Connections
f
g
when using the speaker input wire.
1 Battery wire (sold separately)
h Fuse 40 A × 2 (GM-D8701) / 40 A × 3 (GM-
! The maximum length of the wire be-
D9701)
tween the fuse and the positive + term-
i Front side
inal of the battery is 30 cm.
j Rear side
! For the wire size, refer to Connecting the
power terminal. The battery wire, the
ground wire and the optional direct
Before connecting the
ground wire must be same size. After
amplifier
making all other connections at the am-
plifier, connect the battery wire terminal
WARNING
of the amplifier to the positive + term-
! Secure the wiring with cable clamps or adhe-
inal of the battery.
sive tape. To protect the wiring, wrap sections
2 Fuse 100 A (GM-D8701) / 150 A (GM-D9701)
in contact with metal parts in adhesive tape.
(sold separately)
! Never cut the insulation of the power supply
Each amplifier must be separately fused at
to feed power to other equipment. Current ca-
100 A (GM-D8701) / 150 A (GM-D9701).
pacity of the wire is limited.
3 Positive + terminal
4 Negative (*) terminal
CAUTION
5 Battery (sold separately)
! Never shorten any wires, the protection circuit
6 Ground wire, Terminal (sold separately)
The ground wires must be same size as the may malfunction.
battery wire. ! Never wire the speaker negative cable directly
Connect to metal body or chassis. to ground.
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Connecting the units
! Never band together multiple speaker's nega- When connecting to one speaker
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 re-
main 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 am-
plifier as far away as possible from the anten-
na, antenna cable and tuner.
Speaker output
When connecting to two speakers
The output from two speakers is the same as
Connecting the speakers
that of one speaker.
This amplifier can be connected to two speak-
ers 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 syn-
thetic impedance less than 1 W, as a nor-
mal function, this amplifier may
automatically be set on mute if outputting
Speaker output
high volume sound. Turn down the volume
until the mute function is canceled.
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