The Ref 50 is in my pre/pro chart , but basically it adds balanced pre-amp outputs, THX Ultra processing, a few more digital inputs, an extra component video input, and less flexible bass management (single crossover point for all channels).

Based on different users' comments on the Model 770 and the Model 200 (including this review ), there is no real audible difference between a single 770 and seven 200's. It would probably be simpler to provide power to the 770 than to all of the 200's (one power cord rather than seven).

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review