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CAUTION
! Always keep the volume low enough to hear
outside sounds.
! Extended use of the car stereo while the en-
gine is at rest or idling may exhaust the bat-
tery.
! This product is evaluated in moderate and tro-
pical climate condition under the Audio, video
and similar electronic apparatus - Safety re-
quirements, IEC 60065.
! The graphical symbol
placed on the
product means direct current.
! Connect either of three subwoofers to the am-
plifier; 1: a subwoofer with a 300 W (GM-D8701
and GM-DX871) / 500 W (GM-D9701 and GM-
DX971) or larger nominal input and an impe-
dance 4 W, 2: a subwoofer with a 500 W (GM-
D8701 and GM-DX871) / 800 W (GM-D9701
and GM-DX971) or larger nominal input and
an impedance 2 W or 3: a subwoofer with a
800 W (GM-D8701 and GM-DX871) / 1 200 W
(GM-D9701 and GM-DX971) or larger nominal
input and an impedance 1 W.
If the nominal input and impedance are out of
the above ranges, the subwoofer may catch
fire, emit smoke or become damaged.
About the protection function
This product has protection function. When this
product detects something abnormal, the follow-
ing 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 situa-
tions 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.
<5707000012760V>5
En
Before you start
What’s what
GM-D8701 and GM-DX871
Front side
21 3 4
Rear side
GM-D9701 and GM-DX971
Front side
21 3 4
Rear side
To adjust the switch, use a flathead screwdri-
ver 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 con-
trols to a lower level. If distortion occurs
when the car stereo volume is turned up,
turn these controls to a higher level.
! 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 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
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 Con-
nection diagram.
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.
<5707000012760V>6
En
Setting the unit
! A cut in sound output may indicate impro-
per 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)
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.
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.
<5707000012760V>7
En
Setting the unit
Connection diagram
h
2
a
9
8
6
7
3
b
c
d
5
j
i
f
g
e
4
1
1 Battery wire (sold separately)
! The maximum length of the wire be-
tween the fuse and the positive + term-
inal 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 am-
plifier, connect the battery wire terminal
of the amplifier to the positive + term-
inal of the battery.
2 Fuse 100 A (GM-D8701 and GM-DX871) / 150 A
(GM-D9701 and GM-DX971) (sold separately)
Each amplifier must be separately fused at
100 A (GM-D8701 and GM-DX871) / 150 A (GM-
D9701 and GM-DX971).
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 sepa-
rately)
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
(16 ft. 5in.))
d RCA input jack
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.
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 term-
inal 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 and GM-DX871) /
40 A × 3 (GM-D9701 and GM-DX971)
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 ca-
pacity of the wire is limited.
CAUTION
! Never shorten any wires, the protection circuit
may malfunction.
<5707000012760V>8
En
Connecting the units
Do not allow this unit to come into contact with
liquids. Electrical shock could result. Also, dam
-
age 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 * terminal of
the battery beforehand to avoid the risk of elec
-
tric 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 en-
gine is at rest or idling may exhaust the bat-
tery.
! This product is evaluated in moderate and tro-
pical climate condition under the Audio, video
and similar electronic apparatus - Safety re-
quirements, IEC 60065.
! The graphical symbol
placed on the
product means direct current.
! Connect either of three subwoofers to the am-
plifier; 1: a subwoofer with a 300 W (GM-D8701
and GM-DX871) / 500 W (GM-D9701 and GM-
DX971) or larger nominal input and an impe-
dance 4 W, 2: a subwoofer with a 500 W (GM-
D8701 and GM-DX871) / 800 W (GM-D9701
and GM-DX971) or larger nominal input and
an impedance 2 W or 3: a subwoofer with a
800 W (GM-D8701 and GM-DX871) / 1 200 W
(GM-D9701 and GM-DX971) or larger nominal
input and an impedance 1 W.
If the nominal input and impedance are out of
the above ranges, the subwoofer may catch
fire, emit smoke or become damaged.
About the protection function
This product has protection function. When this
product detects something abnormal, the follow-
ing 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 situa-
tions 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.
<5707000012760V>5
En
Before you start
What’s what
GM-D8701 and GM-DX871
Front side
21 3 4
Rear side
GM-D9701 and GM-DX971
Front side
21 3 4
Rear side
To adjust the switch, use a flathead screwdri-
ver 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 con-
trols to a lower level. If distortion occurs
when the car stereo volume is turned up,
turn these controls to a higher level.
! 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 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
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 Con-
nection diagram.
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.
<5707000012760V>6
En
Setting the unit
! A cut in sound output may indicate impro-
per 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)
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.
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.
<5707000012760V>7
En
Setting the unit
Connection diagram
h
2
a
9
8
6
7
3
b
c
d
5
j
i
f
g
e
4
1
1 Battery wire (sold separately)
! The maximum length of the wire be-
tween the fuse and the positive + term-
inal 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 am-
plifier, connect the battery wire terminal
of the amplifier to the positive + term-
inal of the battery.
2 Fuse 100 A (GM-D8701 and GM-DX871) / 150 A
(GM-D9701 and GM-DX971) (sold separately)
Each amplifier must be separately fused at
100 A (GM-D8701 and GM-DX871) / 150 A (GM-
D9701 and GM-DX971).
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 sepa-
rately)
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
(16 ft. 5in.))
d RCA input jack
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.
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 term-
inal 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 and GM-DX871) /
40 A × 3 (GM-D9701 and GM-DX971)
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 ca-
pacity of the wire is limited.
CAUTION
! Never shorten any wires, the protection circuit
may malfunction.
<5707000012760V>8
En
Connecting the units
CAUTION
! Always keep the volume low enough to hear
outside sounds.
! Extended use of the car stereo while the en-
gine is at rest or idling may exhaust the bat-
tery.
! This product is evaluated in moderate and tro-
pical climate condition under the Audio, video
and similar electronic apparatus - Safety re-
quirements, IEC 60065.
! The graphical symbol
placed on the
product means direct current.
! Connect either of three subwoofers to the am-
plifier; 1: a subwoofer with a 300 W (GM-D8701
and GM-DX871) / 500 W (GM-D9701 and GM-
DX971) or larger nominal input and an impe-
dance 4 W, 2: a subwoofer with a 500 W (GM-
D8701 and GM-DX871) / 800 W (GM-D9701
and GM-DX971) or larger nominal input and
an impedance 2 W or 3: a subwoofer with a
800 W (GM-D8701 and GM-DX871) / 1 200 W
(GM-D9701 and GM-DX971) or larger nominal
input and an impedance 1 W.
If the nominal input and impedance are out of
the above ranges, the subwoofer may catch
fire, emit smoke or become damaged.
About the protection function
This product has protection function. When this
product detects something abnormal, the follow-
ing 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 situa-
tions 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.
<5707000012760V>5
En
Before you start
What’s what
GM-D8701 and GM-DX871
Front side
21 3 4
Rear side
GM-D9701 and GM-DX971
Front side
21 3 4
Rear side
To adjust the switch, use a flathead screwdri-
ver 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 con-
trols to a lower level. If distortion occurs
when the car stereo volume is turned up,
turn these controls to a higher level.
! 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 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
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 Con-
nection diagram.
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.
<5707000012760V>6
En
Setting the unit
! A cut in sound output may indicate impro-
per 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)
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.
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.
<5707000012760V>7
En
Setting the unit
Connection diagram
h
2
a
9
8
6
7
3
b
c
d
5
j
i
f
g
e
4
1
1 Battery wire (sold separately)
! The maximum length of the wire be-
tween the fuse and the positive + term-
inal 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 am-
plifier, connect the battery wire terminal
of the amplifier to the positive + term-
inal of the battery.
2 Fuse 100 A (GM-D8701 and GM-DX871) / 150 A
(GM-D9701 and GM-DX971) (sold separately)
Each amplifier must be separately fused at
100 A (GM-D8701 and GM-DX871) / 150 A (GM-
D9701 and GM-DX971).
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 sepa-
rately)
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
(16 ft. 5in.))
d RCA input jack
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.
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 term-
inal 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 and GM-DX871) /
40 A × 3 (GM-D9701 and GM-DX971)
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 ca-
pacity of the wire is limited.
CAUTION
! Never shorten any wires, the protection circuit
may malfunction.
<5707000012760V>8
En
Connecting the units
CAUTION
! Always keep the volume low enough to hear
outside sounds.
! Extended use of the car stereo while the en-
gine is at rest or idling may exhaust the bat-
tery.
! This product is evaluated in moderate and tro-
pical climate condition under the Audio, video
and similar electronic apparatus - Safety re-
quirements, IEC 60065.
! The graphical symbol
placed on the
product means direct current.
! Connect either of three subwoofers to the am-
plifier; 1: a subwoofer with a 300 W (GM-D8701
and GM-DX871) / 500 W (GM-D9701 and GM-
DX971) or larger nominal input and an impe-
dance 4 W, 2: a subwoofer with a 500 W (GM-
D8701 and GM-DX871) / 800 W (GM-D9701
and GM-DX971) or larger nominal input and
an impedance 2 W or 3: a subwoofer with a
800 W (GM-D8701 and GM-DX871) / 1 200 W
(GM-D9701 and GM-DX971) or larger nominal
input and an impedance 1 W.
If the nominal input and impedance are out of
the above ranges, the subwoofer may catch
fire, emit smoke or become damaged.
About the protection function
This product has protection function. When this
product detects something abnormal, the follow-
ing 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 situa-
tions 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.
<5707000012760V>5
En
Before you start
What’s what
GM-D8701 and GM-DX871
Front side
21 3 4
Rear side
GM-D9701 and GM-DX971
Front side
21 3 4
Rear side
To adjust the switch, use a flathead screwdri-
ver 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 con-
trols to a lower level. If distortion occurs
when the car stereo volume is turned up,
turn these controls to a higher level.
! 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 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
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 Con-
nection diagram.
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.
<5707000012760V>6
En
Setting the unit
! A cut in sound output may indicate impro-
per 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)
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.
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.
<5707000012760V>7
En
Setting the unit
Connection diagram
h
2
a
9
8
6
7
3
b
c
d
5
j
i
f
g
e
4
1
1 Battery wire (sold separately)
! The maximum length of the wire be-
tween the fuse and the positive + term-
inal 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 am-
plifier, connect the battery wire terminal
of the amplifier to the positive + term-
inal of the battery.
2 Fuse 100 A (GM-D8701 and GM-DX871) / 150 A
(GM-D9701 and GM-DX971) (sold separately)
Each amplifier must be separately fused at
100 A (GM-D8701 and GM-DX871) / 150 A (GM-
D9701 and GM-DX971).
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 sepa-
rately)
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
(16 ft. 5in.))
d RCA input jack
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.
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 term-
inal 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 and GM-DX871) /
40 A × 3 (GM-D9701 and GM-DX971)
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 ca-
pacity of the wire is limited.
CAUTION
! Never shorten any wires, the protection circuit
may malfunction.
<5707000012760V>8
En
Connecting the units
CAUTION
! Always keep the volume low enough to hear
outside sounds.
! Extended use of the car stereo while the en-
gine is at rest or idling may exhaust the bat-
tery.
! This product is evaluated in moderate and tro-
pical climate condition under the Audio, video
and similar electronic apparatus - Safety re-
quirements, IEC 60065.
! The graphical symbol
placed on the
product means direct current.
! Connect either of three subwoofers to the am-
plifier; 1: a subwoofer with a 300 W (GM-D8701
and GM-DX871) / 500 W (GM-D9701 and GM-
DX971) or larger nominal input and an impe-
dance 4 W, 2: a subwoofer with a 500 W (GM-
D8701 and GM-DX871) / 800 W (GM-D9701
and GM-DX971) or larger nominal input and
an impedance 2 W or 3: a subwoofer with a
800 W (GM-D8701 and GM-DX871) / 1 200 W
(GM-D9701 and GM-DX971) or larger nominal
input and an impedance 1 W.
If the nominal input and impedance are out of
the above ranges, the subwoofer may catch
fire, emit smoke or become damaged.
About the protection function
This product has protection function. When this
product detects something abnormal, the follow-
ing 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 situa-
tions 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.
<5707000012760V>5
En
Before you start
What’s what
GM-D8701 and GM-DX871
Front side
21 3 4
Rear side
GM-D9701 and GM-DX971
Front side
21 3 4
Rear side
To adjust the switch, use a flathead screwdri-
ver 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 con-
trols to a lower level. If distortion occurs
when the car stereo volume is turned up,
turn these controls to a higher level.
! 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 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
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 Con-
nection diagram.
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.
<5707000012760V>6
En
Setting the unit
! A cut in sound output may indicate impro-
per 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)
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.
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.
<5707000012760V>7
En
Setting the unit
Connection diagram
h
2
a
9
8
6
7
3
b
c
d
5
j
i
f
g
e
4
1
1 Battery wire (sold separately)
! The maximum length of the wire be-
tween the fuse and the positive + term-
inal 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 am-
plifier, connect the battery wire terminal
of the amplifier to the positive + term-
inal of the battery.
2 Fuse 100 A (GM-D8701 and GM-DX871) / 150 A
(GM-D9701 and GM-DX971) (sold separately)
Each amplifier must be separately fused at
100 A (GM-D8701 and GM-DX871) / 150 A (GM-
D9701 and GM-DX971).
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 sepa-
rately)
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
(16 ft. 5in.))
d RCA input jack
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.
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 term-
inal 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 and GM-DX871) /
40 A × 3 (GM-D9701 and GM-DX971)
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 ca-
pacity of the wire is limited.
CAUTION
! Never shorten any wires, the protection circuit
may malfunction.
<5707000012760V>8
En
Connecting the units
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