[Pinscher]

Hey guys,

I need an Amp for my car to replace the factory one because it has dead channels.

My nephew happens to work at a store that sells Rockford Fosgate, and I'm wondering which would work well with the stock E90 head unit?

My car has:
- S663A Radio BMW Professional
- S676A HiFi speaker system

I understand there is a list above of no longer in production "preferred" options, though there is no mention of a product by Rockford Fostgate.

Is anyone able to help?

Thank you!

[ctuna]

A 6 channel amp that will accept differential signal (essentially 5 volt speaker outs)
Rockford Fosgate is not all that popular here.

[Pinscher]

Originally Posted by ctuna

A 6 channel amp that will accept differential signal (essentially 5 volt speaker outs)
Rockford Fosgate is not all that popular here.

Thank you for the response.

How does accepting a differential signal translate to being able to provide 5 volts for output to speakers?

sorry if that's really a poor question here.

[ctuna]

Stereo 101 Low level Outputs are used to feed amps at low levels.
They are either single ended meaning one low level signal and a ground
Or differential Low level signal with two signals in opposite phase with no
ground. You need and Amp capable of accepting a differential pre amp
signal . Most of the better amps can detect either kind of signal an adjust
for it without you having to do anything.

https://www.bestcaraudio.com/differe...e-your-friend/

[Pinscher]

Originally Posted by ctuna

Stereo 101 Low level Outputs are used to feed amps at low levels.
They are either single ended meaning one low level signal and a ground
Or differential Low level signal with two signals in opposite phase with no
ground. You need and Amp capable of accepting a differential pre amp
signal . Most of the better amps can detect either kind of signal an adjust
for it without you having to do anything.

https://www.bestcaraudio.com/differe...e-your-friend/

That's super helpful, thank you so much!