After hearing my ultimax 18, a buddy of mine built himself one using the PE 4CuFt sealed box, same as mine.
Anyway, when driving it to med-high levels, 25hz and lower it makes an odd sound. Not the clanking noise that the bad round of 15"s suffered, it's more of a rubber slapping coming from the driver. It may be there at higher frequencies, but those frequencies have much higher noise factors, which make it so he can't hear it if it is there. We have triple checked for air leaked, and also made sure the surround is properly glued onto the driver.
I've never noticed if it is there on mine, but of course, I can't really crank mine as I live in a condo.
Any ideas on what may be causing it? The amp isn't clipping (it was at -12 on a iNuke 3000dsp), and his AVR has the sub out at -10, so that isn't the cause either.
Anyway, when driving it to med-high levels, 25hz and lower it makes an odd sound. Not the clanking noise that the bad round of 15"s suffered, it's more of a rubber slapping coming from the driver. It may be there at higher frequencies, but those frequencies have much higher noise factors, which make it so he can't hear it if it is there. We have triple checked for air leaked, and also made sure the surround is properly glued onto the driver.
I've never noticed if it is there on mine, but of course, I can't really crank mine as I live in a condo.
Any ideas on what may be causing it? The amp isn't clipping (it was at -12 on a iNuke 3000dsp), and his AVR has the sub out at -10, so that isn't the cause either.