677 Amp replacement

P

Pooltee

Member
I have started noticing increased noise on my audio system at moderate volume levels. Best way to explain it is a lack of clarity and separation and slight high level distortion.

From previous experience this has been the start of an amp failure.

I was wondering if there is any direct replacement options with after market parts, or I need to purchase a replacement from BMW?

If it is the latter, I think I would rather rip out the below par and wrongly named “top Hifi” option, and invest the money into aftermarket improvements.
 
tHERE ARE NO DIRECT REPLACEMENTS TO THE 677 AMP..AFAIK..MAKE SURE A BMW ONE IS THE RIGHT FIRMWARE AND SOFTWARE REVISION..

An alternative is slightly more tricky the 677 uses a fibre optic cable to connect to the head unit not normal 2 wire per channel..
 
Would I be able to get around the fibre issue with a bit 10 converter and then run a normal aftermarket amp? Not fussed about having all 14 speakers running as I don’t use the surround feature most of the time.
 
I’m afraid you’re on your own here...the MOST system is not documented from an external / 3rd party / interface perspective..also it’s a ring bus that needs to be fully linked..any failure of any unit and the whole thing goes down...

So how you split out the 4 channels from the head unit by intercepting the data on the MOST bus is beyond my pay grade (so far)..
 
:D Appreciate the advise. If that’s the case then it is definitely well above my pay grade.

I have a guy at my work place that is a electrical genius ( he repairs all the advanced avionics for commercial jets). If I could source a wiring diagram of the amplifier I have no doubts he would be able to pin point the fault and repair it, but I don’t suppose BMW will make said diagram readily available.
 
Sadly to paraphrase the usual statement... no user serviceable parts inside..

https://www.cartronics.co.uk/car-electrical-repairs-installations

http://www.ampdoctor.co.uk/

These guys maybe able to help..

The technical concepts are not difficult on these babies it’s the proprietary info..
 
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