Subwoofer Crossover point ?

[nicoff]

Originally Posted by crwilli

Most suggestions are rules of thumb. If your main speakers have pretty flat bass but roll off at some frequency, say 40Hz, blending a good sub in at 35-40 makes a lot of sense.

What if in your room, those super main speakers are not flat down to 40 Hz but have a big resonance bump at say, 60Hz, you might want to take advantage of crossing them over above this frequency and using your flexibility in sub placement to avoid that resonance at 60Hz.

That is why I prefer to know how my room measures after I have done the best I can with main speaker placement. I can dial in my sub much better with that data. My ears are not as good as the microphone.

Good luck no matter what you decide to do.

Totally agree. Just because a speaker can go all the way down to, say, 30hz, that does not mean that you may not need help above that frequency.
Measurements can tell you how your speakers interact with YOUR room. You can use the sub to help your speakers compensate for issues/deficiencies that arise from the speakers, their location, and/or their interaction with your room.