Hello... I was playing a CD of a R&B group called "Solo", and this CD has more bass (makes the CD sound bad) than any other CD I've heard. Who ever mix it was probably drunk. I had it cracked up pretty good, because these boys can really sing. On one of the tracks I heard a loud thud/thump come from my left spk. I was sure I had blown the woofer. I played it over and over at a lower volume and the thund was still there. But, it wasn't in the right spk. I bi-amp my spks bass end (passive mode) with 250 watt Onkyo M-508 "Grand Integra's with the big VU meters (Mac look-a-likes). On some CD's the VU meters move like the CD was recorded in stereo, and on others the VU meters move like they are in mono. My ?? is, are CD recorded in stereo or mono? Thanks!!