Raul, You make a good point that the Cary can give 24db of gain if connected in balanced mode. I guess you may be suggesting that the Cary could drive the amplifiers in balanced mode. That is a good idea if the amplifiers have a balanced input circuit. I am of the same mind as you; if it were me I would not want to add a SUT, but the OP seemed to be bending in that direction. I am doubtful that the amps have balanced input, but the OP can tell us.