Hi everybody, I currently have the Technics SA-EX140 stereo receiver hooked up to two JBL N38s (the precursor to the E60s). It is simple stereo (audio only) 100wx2 receiver. I'm now thinking about upgrading my system to more of a complete home theater set-up with a Yamaha receiver (5860, V1500, or V2500). My question is, for music peroformance will I see a big increase in the quality of audio, or is this just going to be an upgrade to add more speakers for Dolby Digital / DTS situations? Also, will an SVS sub blend well with the JBLs? Ideally, I want my subwoofer to disappear into the system. Whenever I go to Best Buy or the like and audition speakers, I hate the sound of the boomy subwoofers that seem to be playing a seperate track from the mains. Thanks for the replies in advance!