Subwoofer in 2.1 system... HELP

Subwoofer in 2.1 setup... LOTS O' QUESTIONS! Need help. I want to add a subwoofer to my music-only, fairly decent stereo system. I currently have a Counterpoint hybrid sa20 amp, Krell KSL-2 s.s. preamp, Sony C333-ES SACD player, and original Von Shweikert VR4 speakers. I would like more bass end (especially on certain types of music and at lower levels), and seek a relatively inexpensive (maybe $800 used?) sub for this purpose. The question is, how the F#$! do I hook the sub up without using the sub as a crossover to my main speakers, or is this not possible to avoid? I dont want to add coloration or more components in the way of the signal if at all possible. Can I put wires for both at the amp posts, or would this somehow fry the ever so touchy Counterpoint? Should I even worry about my speaker wires coming fromm the sub? Also, any thoughts on the type on sub? A Sunfire (junior) maybe?Any help as to my options would be greatly appreciated! Thanks, N