Thanks Dave,
Funnily enough I did have a bi-amped set up a few years ago when I ran an ARCAM 7 integated with an 8P. This drove TDL speakers and seemed to work very well but this set up got left behind following one of those relationship breakdowns and I hung onto my little AURA amp because the phono input was better quality (I believed, sounded better to me anyway!). Having rebuilt the system around ROKSAN Kandy kit driving Quad 21Ls I've been happy with the sound generally but do feel sometimes that sound needs a bit more of the bass sound that the TDL/ARCM set up used to provide. Perhaps a "warmth" that I don't get with the Quads, although there is no doubting the greater level of detail.
The Kandy power amp has been well reviewed and Pluto's advice was veri illuminating because I was wondering whether bi-amping was a bit like bi-wiring and that the benefits were somewhat exaggerated but I can see the science behind bi-amping as the crossover problem is addressed by this route.
I'm going to get the Kandy when I can get the right deal and at some point down the line (and when I've got a lot more money to spend that what I spent on the Quads which were excellent value) I'd like to upgarde the speakers. I'm attracted to the PMC range because of their transmission line design that the TDLs used although I haven't seen these reviewed on AVReview pages as yet. Alternatively, I see quite a few people rave about the Proacs so we'll see - that's some way off anyway.
Of course, with the power amp there'll be interconnects to consider but that's a different and much more controversial thread! A friend gave me my current Nordost leads but I think I'll go for something a little more cost effective if I'm the one paying!
When I do get the Kandy power amp I'll be sure to post a review on the AVR site when I've devoted some quality listening time!
Thanks again for the advice Dave & Pluto, cheers.