Poll: People With Aftermarket Head Units

[Fetch]

I will be installing the headunit & subwoofer from my previous car which somebody rear ended, and then the body shop did such an awful job with repairs (car was unsafe to drive after they 'fixed' it, etc), it was totaled (That's a story for another day).

I have installed a headunit & subwoofer in my friend's E36, and we decided to take the pre-amp outs of the headunit and dump those into the BMW amp. This resulted in great sounding audio, but the volume really has to be turned up a lot to get volume, which results in more noise(which isn't noticeable with music playing).

I have read some people take the amplified speaker outputs on their headunits and dump those into the BMW amp.

How is volume adjustment, and more importantly how is the audio quality in this situation, especially with higher volumes?

I'm only interested in people's experiences with HU Preout --> BMW amp, and people with HU Speaker out --> BMW amp


Thanks!