Alerick · Aug 27, 2016

Hi All.
Can anyone help with a radio problem.?? I have a 300 TDi 1998 and the buttons have fallen off the radio rendering it unusable...So i have bought an after market radio. it works great.. My question is ,,How can i get the rear sub woofer to work with this after market radio ??anyone any ideas ?? thanks in advance ..

discool · Aug 27, 2016

The lack of info on the after market headunit isn't helpful, but dose it have a preamplified sub output, if so just connect that output to the existing audio input wires to the sub amp in the back door and with a bit of adjustment to the head unit gain/bass control and assuming the existing two power supplies to the amp have been connected at the head unit u will have a functioning sub in the back door.
Simples.

Red & Black wires is audio.

brian47 · Aug 27, 2016

Looking at RAVE for the '97 Disco 1, the rear tailgate speakers differ from the Disco 2 ones in that the Disco 1 speakers have a sub-woofer amplifier incorporated on the mounting.
This amp will require some power as well as the audio feed.
From what I can see there are three wires involved with that, two supplying the +12 volts, one permanent and the other a switched voltage from the radio (light green/orange and a purple/yellow wire) and a black ground wire. The audio inputs to the amp are fed on a screened cable with a pair of wires, red and black.
As discool said, you'll probably need to arrange a low level output from the radio to feed the audio to the amp and also check and/or arrange the switched power feed.

Alerick · Aug 28, 2016

discool said:
The lack of info on the after market headunit isn't helpful, but dose it have a preamplified sub output, if so just connect that output to the existing audio input wires to the sub amp in the back door and with a bit of adjustment to the head unit gain/bass control and assuming the existing two power supplies to the amp have been connected at the head unit u will have a functioning sub in the back door.
Simples.

Red & Black wires is audio.

Sorry for the lack of information, but you answer was very helpful i should now,, with the diagram from brian 47 be able to sort it .
thank you again
Ken

Alerick · Aug 28, 2016

brian47 said:
Looking at RAVE for the '97 Disco 1, the rear tailgate speakers differ from the Disco 2 ones in that the Disco 1 speakers have a sub-woofer amplifier incorporated on the mounting.
This amp will require some power as well as the audio feed.
From what I can see there are three wires involved with that, two supplying the +12 volts, one permanent and the other a switched voltage from the radio (light green/orange and a purple/yellow wire) and a black ground wire. The audio inputs to the amp are fed on a screened cable with a pair of wires, red and black.
As discool said, you'll probably need to arrange a low level output from the radio to feed the audio to the amp and also check and/or arrange the switched power feed.

View attachment 106237

Hi .your answer inc the diagram was very helpful i will now be able to sort it out
Thank you very much
Regards
Ken

discool · Aug 28, 2016

I've looked at my notes on the installation of a replacement head unit, mine is a Pioneer so they may be applicable to you, maybe not.
purple--permanent live
green/orange-- switched live
red/brown--lighting
blue/yellow--amp switching
12+v amp power is taken from the head unit permanent supply, (light green/orange wire at the amp) same supply for the head unit .
12+v amp switching wire supplies and is switched by the head unit (purple/yellow at the amp), new head units have a switched output normally a blue wire.
Anyway all the feeds etc are in the ISO block/s some where

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