You should check the phase setting or your wiring to be sure the speakers and the subs speaker cones travel in and out together ie. in phase. If they travel in opposite directions that would cause cancellation of the sound for those frequencies where the main speakers have enough output to cancel the subs output.
Subwoofer Frequency Response question
I just started testing my frequency response with a Radio Shack SPL meter (digital). My subwoofer is a Paradigm PW-1100 (10 in) with Green Mountain Europa speakers. The room is small, 12 X 14 X 9. The frequency response is generally very good with bass response down to 25 Hz. My issue is I have a dropout of nearly 20 db starting at 45 hz through about 70 hz. I have not been able to change it by moving the sub or changing the settings (phase and crossover point). I also have the sub on an elevated platform of 1 1/4 inch MDF with spikes between sub and platform.
I am wondering if adding internal bracing and additional acoustic dampening material to the sub woofer would change the response characteristics in a positive way.
Any ideas would be appreciated.
I am wondering if adding internal bracing and additional acoustic dampening material to the sub woofer would change the response characteristics in a positive way.
Any ideas would be appreciated.