I suppose I'll throw in my .02 for the Rels. I've actually heard dynaudio confidence 3's hooked up with a rel. Sounded pretty impressive. It was done using the speaker level, which is how I have my rel storm III hooked up at home. It's fairly easy, since the bare wire can be wrapped around the binding posts without really getting in the way of the spades for the speaker cables. If your 380 has two sets of main outs, you can use any sub with a line level input, since most good subs have an internal crossover (although of course you can always use an external, though that's more dough in the end probably). Most subs can also be put 'between' a preamp and an amp, using line level inputs and outputs on the sub, or between an amp and speakers, using speaker level inputs and outputs on the sub. In my experience this generally degrades the signal to the mains, though my experience is not that vast. Just as one final added note, to throw in with cornfedboy, the rels do have many advantages for integration with the mains. however, they're generally crossed over lower than other subs, and it will be a bit more difficult with speakers that won't go very low.
Subwoofer hookup
I have a great sounding high end system that I'm very happy with. It consists of Dynaudio Confidence 5 speakers, a Plinius SA-250 Mk 4 power amp, a Mark Levinson 380 preamp, 37 disc transport and 360S DAC with Nordost SPM interconnects. My question is: if I wanted to integrate a subwoofer into this system, how do I do it? Where does one "splice" it in? And if it was doable what would be an appropriate make and model of subwoofer that could seamlessly integrate into this system. I look forward to your response.
Harvey
Harvey