Can you help me out here would you sell a 4b? And buy 2 7bs and lose money or would you buy another 4b to use it as a mono.?
I would sell the 4BSST² buy two 7BSST². Lose money? Not necessarily, but a bit more of a hassle to for an additional sales transaction. The retail price of two 4BSST² ($9,990) and two 7BSST² ($10,200) are within a few hundred dollars.
The used market would be proportional. For example, on Audiogon there are currently three 4BSST² for sale asking from $3400 to $3549 each, and two pairs of 7BSST² asking $6300 to $6500 per pair.
However, if you're talking about buying another new 4BSST² vs. selling yours and buying two new 7BSST², then yes, you would be taking a several thousand dollar loss.
Steve