Hi James;
The various amplifiers have different current capacities from their outputs. The 3B SST, for instance, is capable of about 38-40 Amps peak per channel, the 4B SST can deliver about 50 Amps peak, the 7B SST and the 14B SST are capable of 60 Amperes. The smaller amplifiers, including the 2B LP, the B-60 and the 2B SST can deliver about 25 Amps peak. The 9B SST can deliver about 35 Amps per channel. In each case, this allows full current into loads as low as 1.5 Ohms.
I hope this helps.
cwr