Has anyone ever used or owned one of these? I am considering a Vs900 or Vs1100. They seem to be well made and have damping factors of >1000. Is it a bad idea to buy a used power amp? Also, I was wondering if anyone has ever plugged directly into a power amp. I run my amp pretty flat as it is, and wondered if this would work. Maybe throw a graphic EQ pedal inbetween. Thanks for your opinions.