I'm dabbling in the Meridian 500-series second-hand market at the moment (just got a bargain 551 amp) and would be very interested in hearing views (+ve or -ve) on the 566 DAC (20- or 24-bit versions). I'd also be interested in any perceived (or otherwise!) differerences between the two. If I bought a 566, I look eventually to use it in conjunction with a 518. Thanks, Joel P.S. Please state which version you're referring to!