[mightbaal]

I have looked around a bit and alot of the stuff seems a bit outdated with links to discontinued amps n such. But I need a decent DIY for a budget slight amp upgrade for the subs in my 2008 335xi sedan with the HiFi Logic 7 professional sound system as the subs dont put out much bass at all. I do not want to cut the factory wires... If possible...

[Addison942]

There are many opinions over here about this but personally I don't think that underseats do the job. Asking a speaker to play midbass and sub-bass is just never ideal no matter how much power you give them. That said, Technic makes a "add a sub" harness if you want to add a trunk sub as well as another harness to amp the underseats without cutting factory wiring. Send him a message and see what he recommends

[mwahlert]

Originally Posted by Addison942

There are many opinions over here about this but personally I don't think that underseats do the job. Asking a speaker to play midbass and sub-bass is just never ideal no matter how much power you give them. That said, Technic makes a "add a sub" harness if you want to add a trunk sub as well as another harness to amp the underseats without cutting factory wiring. Send him a message and see what he recommends

a new option
http://www.rockfordfosgate.com/News/....aspx?id=14220