Why don't you contact the good people at Empirical Cables? I think they use those Kefs as a reference....make interesting cables too.
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Tcraney: I too own a pair of KEF Ref Series 104/2 and am currently evaluating my preamp+poweramp options. I'm considering buying a tube preamp (e.g. First Sound Presence Deluxe Mk II, or Sonic Frontiers Line 3, or Joule LAT-150) and tube amp (either 2 monoblocks or 2 stereo amps in a vertical biamped configuration). Some suggested tube amps could include: VTL MB-185, Atma-Sphere M-60, Berning ZH-270, or Sonic Frontiers Power 2). Make sure that the ratio between the preamp's output impedance and the power amp's input impedance is at least 1:10 and maybe 1:100. For example a 500ohm preamp output impedance could match well with a 5,000 to 50,000 ohm amp input impedance. If the ratio can't be attained then it's recommended that you keep the interconnect length short.
By the way, would you share with me what you find out at Empiracle cables? Thanks.
Just in case if anyone stumbles upon this thread like I did via my favorite search engine. A preamp and amp combo that I enjoyed immensely with a pair of KEF 104/2s was a McCormack TLC-1 Deluxe with a McCormack DNA .5 Deluxe. For me it was a very enjoyable combo. I then used a Kavent S33 preamp and a Kavent P-3300 amp combo. This set was even more enjoyable. Sweet mids and wonderful bass.