Pioneer GM-D8604: Setting the unit

Section

02

Setting the unit

equipped Pioneer car stereo, with maxi-

What’s what

mum output of 4 V or more, adjust level

Front side

to match that of the car stereo output.

4

! For use with an RCA equipped car stereo

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with output of 4 V, set to the H position.

4 LPF (low-pass filter)/HPF (high-pass fil-

ter) select switch

Switch the settings based on the connected

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speaker.

1

2

! When the Subwoofer is connected:

Select LPF. This eliminates high range

Rear side

frequency and outputs low range fre-

quency.

! When the full range speaker is con-

nected:

Select HPF or OFF. HPF eliminates low

To adjust the switch, use a flathead screwdri-

range frequency and output high range

ver if needed.

frequency. OFF outputs the entire fre-

quency range.

1 POWER/PROTECT indicator

The power indicator lights up to indicate

5 INPUT SELECT (input select) switch

power ON.

Select 2CH for two-channel input and 4CH

! If something is not normal, the indicator

for four–channel input.

turns red.

2 FREQ (cut off frequency) control

Setting gain properly

Cut off frequency selectable from 40 Hz to

500 Hz if the LPF/HPF select switch is set to

! Protective function included to prevent

LPF or HPF.

malfunction of the unit and/or speakers

due to excessive output, improper use or

3 GAIN (gain) control

improper connection.

Adjusting gain controls CHANNEL A (chan-

! When outputting high volume sound etc.,

nel A) and CHANNEL B (channel B) helps

this function cuts off the output for a few

align the car stereo output to the Pioneer

seconds as a normal function, but output

amplifier. Default setting is the NORMAL

is restored when the volume of the head

position.

unit is turned down.

If output remains low, even when the car

! A cut in sound output may indicate impro-

stereo volume is turned up, turn controls to

per setting of the gain control. To ensure

lower level. If distortion occurs when the car

continuous sound output with the head

stereo volume is turned up, turn these con-

unit at a high volume, set amplifier gain

trols to higher level.

control to a level appropriate for the preout

! If using only one input plug, set the gain

maximum output level of the head unit, so

controls for speaker outputs A and B to

that volume can remain unchanged and to

the same position.

control excess output.

! For use with an RCA equipped car stereo

(standard output of 500 mV), set to the

NORMAL position. For use with an RCA

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Section

Setting the unit

02

English

! 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

Signal waveform distorted with high output, if

you raise the gain of the amplifier the power

changes only slightly.

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