Adding an amplifier E60 535i USA HIFI

[Dark Vader]

I have a 2010 E60 535i with Hifi (USA)

My front and rear speakers are powered from the head unit and the underseat subs are powered by a small amplifier in the trunk (boot) on the left side (tweeters in front sail panels, mids in doors, speakers in rear deck, underseat 8” ‘subs’)

I’ve tapped into the low level wires in the harness and made RCAs to provide signal to a new subwoofer amplifier…

But I would like to see a wiring diagram for this setup so I can tell which wires are which for future reference… (found the low level sub left and right, and the turn on lead which were all I needed at the time)

I want to eventually amplify the rest of the system and I’m looking for an ‘easy’ route even if it’s a small 4ch 75 x 4… and I wouldn’t mind giving some more power to the underseat ‘subs’ and running them as a true midbass driver

What are my options for amplifying the rest of the sound system?

Thx!!!

[Dark Vader]

Also.., I don’t know if the amp in the trunk is powering anything else other than the underseat woofers… some diagrams show that it’s a six channel that’s powering the midranges and tweeters but some people are saying that the head unit is powering the mids and tweets

If it’s the former, it would make it ‘easy’ to re amplify the system… just replace the amp in the trunk… where the latter would require re-running new wires throughout the car

Can someone chime in?

MDecode results:

Multimedia
S639 Preparation F Mobile Phone Cpl. USA/CDN
S645 BMW US Radio
S663 Radio BMW Professional
S676 HiFi Speaker System
S693 Preparation BMW Satellite Radio
S697 Area-Code 1 For DVD
S6FL USB/Audio Interface

[Dark Vader]

Well…. I found out the amp in my trunk is a 2 channel amp powering my under seat woofers with 40 x 2 and the rest of the speakers a running off my head unit…

meh

[V10Zoe]

What did you end this project?