Crossover point is very speaker dependent BUT I have pretty much always found it best to cross-over where the mains bass driver hits minimum motion. Meaning where the bass driver’s output drops off and the port picks up. For many speakers this is 50hz-ish give or take.
You can run the speaker lower but most of the time the sub is much better than your speakers below 50z (even large good passive speakers). This also frees up the main amp to not work as hard and take vibrations out of your mains.
Saddly large speakers work better with subs than small speakers. They blend better and the power-band hand off is better too.
You can run the speaker lower but most of the time the sub is much better than your speakers below 50z (even large good passive speakers). This also frees up the main amp to not work as hard and take vibrations out of your mains.
Saddly large speakers work better with subs than small speakers. They blend better and the power-band hand off is better too.