If you can't get proper bass sound out of LFS, there is something wrong with you, not with the LFS.
I myself have to adjust the subwoofer output almost to zero to not to kill my ears while driving LFS. If I keep the settings like in many other games, my whole friggin room will shake while motor-braking with XRT.
Working 5.1 system would be good tho.
And no, no voice chat. I already hate to hear people doing stupid sounds on other games whit VOIP. If you want to voice chat with your friends use Team Speak or Ventrilo or similar.
Also suggested before.