Anyone tried biamping with an Accuphase E-560?

Accuphase E-560 owners - have any of you tried adding a power amp and passively biamping?

If yes, do you have to add an amp with the same rated power (in which case, the second amp would have to be the A-35), or can it be done with say the A-46 or even P-6100?

Or would be better to just add a power amp and use the E-560 as a preamp?

Thanks in advance.