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If I tried to get 110 dB, I think it would explode.
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Mike, I've noticed audible port chuffing at the 25hz and below frequencies starting at about 100db corrected.
What source/signal are you using for your tests? I'm using the snapbug's sine tones.
I first performed system calibration to 75db mains/surrounds and then had the sub at +3-4db for uncorrected measurements of 78-79db using my Pio 1014's test tones.
After calibrated, I went to town with the sine tones starting at 80hz to set my phase correctly via RS spl meter with my sub AND my mains running. This allows you to see any cancellation between the sub and mains.
Once that was done, I cut the mains off, and then worked my way down the frequencies from 80, 60,50,40,31.5, 30,29,28 etc. all the way down to 14hz. The freq. I concentrated on was 20Hz using repeat on my source and turned the volume up to just before distortion/compression/doubling occurred ( I did this by turning up slowly until that point and turning back until it was gone again). I mounted the RS meter on a tripod 1 meter from the face of the sub with the grill off and just watched in awe so to speak.
I kept my hand on the volume just in case but Ed Mullen has already performed this type of testing so I was comfortable doing the same:
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As a guide for setting the maximum playback level, I normally increase the master volume until minor distortion and compression artifacts are noted on the deepest and most challenging scenes. But with the PB10-ISD, I discovered it’s nearly impossible to drive this subwoofer into audible distress.
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I hope this helps, remember these are "corrected" values. Uncorrected I was able to reach 104db @20Hz at 1meter.
