I know that the 32, 42 and 42.5 preamps are what you refer to as half size. The .5 designation meant that the preamp allowed the use of a Hicap power supply. Without this designation you either relied on the amps power supply or Snaps power supply. I owned a 4.5/Hicap/110 which were all housed in the half sized cases. The strength of a modestly rated Naim amplifier is its ability to drive very difficult loads. The Naim amps are particulary suited if one needs to run long lenghts of speaker cable. It's killer gear. The downside to the Naim equipment is the type of interconnects used. If you are into analog playback only, the 32 preamps are considered by many to best the best. Rated watts per channel do not mean a great deal, IMHO, but as always, more power is better.
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