You would need to look at your sub schematics and your amp .
Some units that are fully balanced cannot have subs hooked up in the normal accepted fashion via the speaker terminals, pos to pos and neg to neg.
There are ways round this but you would need research it and there are some threads here on that subject.
I assume that the TACT does not have a dedicated sub out or variable analog out and you were thinking of connecting via the speaker terminals?
Some units that are fully balanced cannot have subs hooked up in the normal accepted fashion via the speaker terminals, pos to pos and neg to neg.
There are ways round this but you would need research it and there are some threads here on that subject.
I assume that the TACT does not have a dedicated sub out or variable analog out and you were thinking of connecting via the speaker terminals?