Your choice-making procedure is, imho, a little backwards. Why decide on having a sub (and a particular one) and then open discussion on the main speakers?
That said, there is an advantage in that (1) using a sub not only increases power handling in the main speakers, it off-loads power demands from the main amps and (2) it allows you to position (and/or EQ) the sub to compensate for room modes while allowing you to position the main speakers for imaging and balance.
Kal (who uses a sub with full range speakers)
That said, there is an advantage in that (1) using a sub not only increases power handling in the main speakers, it off-loads power demands from the main amps and (2) it allows you to position (and/or EQ) the sub to compensate for room modes while allowing you to position the main speakers for imaging and balance.
Kal (who uses a sub with full range speakers)