3 18" HDC3's - 4th order??

[Qxxx4]

Looking for some options and opinions on a box for 3 18" HDC3's.

Was thinking of doing a 4th order since Ive never done one before, but dont know how the subs would like it... Ive got the room for it if I wall off behind the front seats....

Any opinions or box ideas on rough dimensions. I dont have a ton of height or width but Ive got lots of depth. Think I have 36" width - 30"height and like 54" depth....

Would a 4th order still rock out and murder the lows but play rock music well?? Aq's seem to have weird tuning preferences

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[galacticmonkey 5,000+ posts]

AQs are gay.

But anyway, if youre going to do a 4th order make the box as big as possible. Try to do a flatwall in the very back with all the subs on the same face. Look for around 6.5-8 cubes sealed. Then go as big as possible ported. Build the port so that its got about 25-30in^ of port per cubic foot of ported air space. Tune to like 50hz and you should be jamming.

 

[Qxxx4]

Im curious if the aq's even sound good in a 4th order myself, over straight ported anyways....

I dont quite understand the tuning of the ported chamber though. If I wanna make it a straight box with no odd shapes I have a max of 37" width and 31" height and like 48-50"depth. I could get alot more space if I made the box over the wheel wells and such, but wouldnt be nearly as easy to build or remove