Musicar Level 2 System has plenty of sound quality and depth
Level 1 is 10 times better than Hi Fi . But they are not surround sound.
They are one of the easiest way's to get a significant total upgrade.
The BSW approach is just a better speaker patch so far,which works best
for and L7 as the amp has a little power.
The standard fix for the Hi Fi system is a Jl 600/6 and better speakers.
for at least the front doors and floors.
Its hard to compare these when you can't here them side by side.
http://www.e90post.com/forums/showth...=759664&page=2
Reason's for the XD
Its a quality mid range priced amp.
It has the exact number of channels to match Hi Fi(xd 600/6)
It fits in the same area as the OEM Hi Fi amp
It has the right kind of Inputs to be compatible with the
Hi Fi Head Unit . (balanced differential inputs)
If you get good speakers with just the amp its pretty awesome.
If you like old style stereo with Morels and Jehnerts this is
an audiophile level system.