The Cue acoustic model r1 gets rave reviews. It is expensive but the price is pretty good when purchased with the 2150. I'm thinking of buying the pair. I'll bet it will sound better than the SB boombox . . . .
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macmini (as server) -> Logitech Squeezebox -> Outlaw RR2150 -> PSB Imagine B, Beyerdynamic DT880