FYI, I have tried the 4BSST2 with several preamplifier using unbalance and balance. In a Bryston rig there are better synergy in balance connection even when connected with other brands of preamplifier I have the same results. The BP26 is a tough one to beat and its a bloody fine preamplifier for the money. You will need to fork out real money to beat that and I can assure you will be happy for a long time!