No. The 4BSSTs in mono are not recommended for driving loads of less than 8 ohms.
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Elgordo is absolutely correct. I confirmed this with a Bryston tech when I was comparing both amps for a subwoofer application. The wattage might be close, but a bridged 4B ST won't be able to handle the very low impedance loads the 7B ST is designed for. Plus, the 7B ST should have much more current.