I'm guessing the 3BSST2 was chosen over the 7BSST2 for a cost savings of ~ $4K, which of course is not a small amount of money.
But in the context of a very expensive home theatre, if they should decide to change speakers at some point, they would be limited to choosing 8 ohm models only.
Also on the Bryston website the specifications say "30,000 MFD per channel" for both amplifiers. Does this mean the 7BSST2 would only have 30,000 MFD but the 3BSST2 bridged would have 60,000 MFD?
What would be the sonic difference between the 3BSST2 bridged versus the mono 7BBST2 besides the obvious difference of 400W versus 600W?
Steve