- Thread Starter
- #21
I have always got better results when using linear phase crossover vs minimum phase crossoverI' NOT a room-correction expert...
Phase differences will ONLY be an issue in the narrow band around 80Hz where the regular woofer and sub are working together (where the soundwaves might be partially or completely out-of-phase relative to each other).
Assuming there is no "different DSP processing" to the high-pass or low-pass signal paths, and assuming neither one is inverted relative to the other, the ONLY phase-timing issues will be from difference in distance between the sub and the main speaker to your listening position.
The wavelength at 80Hz is 14 feet. So a half-wavelength is 7 feet and if the sub or main speaker is 7 feet closer than the other, you'll have a 180 degree phase-shift (at 80Hz) and the soundwaves will cancel. That's the worse case. (At 1.5 wavelengths you'll get 540 degrees and cancelation.) It wouldn't be unusual to have the main & sub 7-feet apart but a 7 foot difference would be unusual at home.
And since sound travels about 1 foot per ms, 7 feet is about 7 ms of time difference. (If you delay the nearest speaker by 7ms they will be back in- phase at 80Hz).
This post is about my main system:
Post in thread 'Lavoce SSF153.00 15" based dual opposed subwoofer project' https://audiosciencereview.com/foru...-opposed-subwoofer-project.51178/post-1852855
And this one is about my home office system:
Post in thread 'Another 8" dual opposed subwoofer project' https://audiosciencereview.com/foru...-opposed-subwoofer-project.55078/post-2033114