why so many layers? you shouldn't need all those layers just use some wooden dowels or all thread so you can get more air space. with that power you'll need about 4-4.5 cubes after displacement per
first off do NOT use bass boost its just plain old clipping waiting to happen second you did it right jeff set the hu to just below clipping which is typically 3/4 volume but it may not so set it below clipping then do you amps's gain with the knob all the way up.
also i believe some filters can cause clipping not sure on that one i think i heard that somewhere
well i'd like to see how those amps were set then. I bought my Aq3500.1 off a guy who had an spl wall setup and burped 2 AQ HDC3's with copper coild on a pair of strapped @ 1ohm AQ3500.1bds
just saying copper will be more musical too your not running to much power
also you did state this was for spl.. obviously for daily the more motor force and motors to spread the power out the better usually
set the gains properly and find your peak frequency. Find a Test tone for that Hz thats about 30sec, play it starting at a low volume. Then roll into it(turning up the volume or gains knob). You just burp your system
If you want to get the 1500 get it just dont clip and build the box propely i had my Aq 2200 on a single Fi Q 15 old style with bp power at one ohm with out one problem with power handeling. build the box to about 3.25-3.4 cubes after displacement and port
Hey i had to wait for the other stuff that happened so your not the only one but i realize they're busy and they took care of me so no worries on my end