Nob alert. I've been into music all of my 62 years but way behind when it comes to home theater. I have a 9.2 Onkyo receiver driving my Lansing Altec Studio 19 speakers. I've been looking on CL for some used Klipsch or Definitive Tech subs or any other brands. So what if the speakers have a build in amp would I hook that up to my receiver and double my power or look for a sub that either doesn't have an amp or the ability to hook up bypassing the amp build into the sub? Thanks - Jim!!