I hope it's OK reviving this, hard to resist given the OP's and my usernames and considering we also have almost the same query...

I want to use both sets of unbalanced outputs to go to two subs; currently I am using one set with one sub. I am using the balanced outputs to go to my 4B-SST² amp, 2V level as recommended in manual (I reduce sub input level to compensate, "digital" controls so easy). It seems from the BP25 schematics that the balanced and unbalanced outputs are all essentially in parallel.
Question: can the driver circuitry handle all the outputs at the same time without undue probs? I presume yes, otherwise the manual would say, but just want to check. I have heard from others that the BP25 output is pretty "strong", one well-known guy apparently even used it to drive speakers directly as a test.
Thanks.