I auditioned a Calypso Sig and VAC Phi Beta preamp at home using new model Bryston amps and PMC speakers. The Calypso was excellent but the VAC was a serious step up. Of course, the Calypso is around half the price; the Callisto would be the proper Aesthetix model for comparison and I didn't hear it. The Calypso Sig is a terrific preamp, though, and a very good value. I'm sure it mates really well with the Phi 200 amp.
