Capacitor hidden in speaker wiring, where?

[944_Driver]

My first post in this forum :)

To the topic:

I am replacing the stock none Bose stereo system (CDR-23 head unit, CD-changer and amplifier connected with MOST) in my 996 C4S 2003 since the amp has broken down. Removing all parts and fitting a Pioneer head unit and DLS amp is done, the head unit drives the speakers in the back and in front while the amp is intended for the door speakers (woofers).

The problem is that the amp does not like to drive the door speakers, it starts to oscillate and shuts off after a few seconds. After removing the speakers in the doors I have found that it appears to be a 100nF capacitor in parallelle with the speaker wires + and -. I suspect that this capacitor is what brings the amp into oscillation since some amplifiers don't like a capacitive load.

Does anyone have an idea where these capacitors are hiding in the wiring harness so I can locate them and remove them? They are not in the doors by the speakers, I have checked...

// Magnus

[jjb7]

The door speakers are only 2 Ohms. Can your amp handle that?

Do you mean 100 micro farads? That capacitor shunts the high frequencies because the door speakers are woofers. When in parallel with the speaker, it forms a low pass filters. This is normal. The other speakers have a capacitor in series with the tweeter to form a high pass filter.

there are no "hidden" capacitors in the wiring.

[944_Driver]

Thanks for your reply.

The door speakers measures 3.6 Ohms in my 'none bose' installation and the amp is 2 Ohm stable so that should not be a problem. No, I mean 100 nano farads, thats what the multimeter says and I guess it is there for filtering out some HF disturbances, the audio filtering is done in the amp most certanly.

Anyway, the problem was solved now by using an other amp for driving the woofers, a cheap class D amp works fine for it, the other amp goes back to the store.

// Magnus