This response may be a bit late, but here goes. I have a pair of BEL 1001 MkV's and have tried several preamps until a ran across a local sale on a used Aesthetix Calypso preamp. The rest of my system is: Ayre C5x-e cd player, MacIntosh MR-67 (modded) tuner, Dali Euphonia MS-5, and all BEL RCA interconnects and speaker cable. This system is very satisfying, and the Calypso preamp has taken the sound to a whole new level.