SVS has an online database that gives recommendations to various speakers crossover. Their recommendation for the M80, which is what i have, is to have the crossover at 60Hz. I set the QS8 are 80Hz. This works well in my room.

Check with SVS and Axiom, they will give you solid recommendation.

Tariq

M80v2 - VP180 - S:QS8 - SB:QS8 - SWide:QS8
Denon 4311 + XPA-3
Sub: Dual SVS Ultra-13