w211 subwoofer upgrade?

[smoothcoupe]

Hello all, I have a w211 e55 with full command and harmon kardon logic 7, the subwoofer in the back is a little weak in my opinion ( doesnt sound too bad). Is there a suitable upgrade that anyone can tell me about.. cheers all.

 

[John]

Have a read through my thread on what I did last year.

Read it all the way through though.

http://www.mbclub.co.uk/forums/electronics/136323-e55k-standard-system-improvements.html