Hi Craig0,

Do your QS4s have the integrated bolt on the rear baffle that fits the Omnimount Series 10 mount (and also our Full Metal Bracket). Older model QS4s or 8s do not have that bolt so you may have to drill into the rear baffle. Stay a couple of inches away from the binding-post assembly (the crossover is mounted to it inside). You could likely use slightly shorter wood screws if you want, like 1/2-inch or 5/8th inch.

Regards,

Alan Lofft,
Axiom Resident Expert (Retired)