It's simple enough, and it works great without modification.
I have noted previously that the best way is to leave the
big caps in the circuit so that the feedback loop remains
cap coupled and DC does not appear at the input. Then you
simply tap off to the speakers inside the caps so that the
speakers are direct coupled.
This works great and gives you the flexibility to run it either
way. I have units are set up with a single XLR, and two RCA's
for inputs, and three pairs of output connectors; two pair
cap coupled for stereo operation, and one pair direct coupled.
With same output power, balanced operation need lower supply voltage than single-ended operation. Because maximum output voltage of balanced topology is double of single-ended topology in ideal case. This means that you can reduce supply voltage in balanced operation, which results in reduction of heat dissipation. How to change register values for that?
If I want balanced only, still do I need big caps(10000 uF) for feedback?
If that's the question, then the answer is that the
ZV4 needs a balanced source to operate balanced.
Because the circuit is inverting, you could drive 1/2
of a bridged pair with a single source and then feed
its output back to the input of the other channel through
the appropriate resistance, and then it would operate
bridged, but this is not as good a solution as operating
balanced mostly because the distortion of the first
channel is reproduced in the second.
The BoSoZ can output a balanced or unbalanced signal, same with input. So with a BoSoZ you could have a balanced or unbalanced input, which you could feed to either a Zen 4, or a Balanced Zen 4.
Also, I assume that English is probably not your native langauge, so just to let you know, it is usually considered impolite and slightly rude to use lots of exclamation marks("!"s) or any at all unless it is really necessary. Just to let you know .