Axiom Home Page Forums General Discussion Technical Questions 3dB frequency point of my M3's?

Using the control on a subwoofer makes it a lot harder to have a smooth transition from the mains to the sub, than it is when using a receiver's crossover setting.

Most of the time the sub's control is a low-pass filter, and not an actual crossover (a crossover being a low-pass paired with a high-pass).

I find it much easier to set up the subwoofer, by totally disregarding the numbers, and doing it by ear (or SPL meter). You'll need to find a low frequency sweep sound. Play that on a loop. Start with the subwoofer's filter setting rather low. There should be a dropout in sound pressure level between the filter point and where the main speakers take over. Gradually raise the setting on the sub until you get a smooth frequency response through the whole transition range. That's where it should be set regardless of what the number says.