Will a 3.1 cuft enclosure (after all displacement) tuned to 38 hz work for a 15" Fi Q? With the size of my truck, this is the largest box that i could fit in there. How will this work?

The size would be fine but why not stay in the recommended hz range and go with like 30-32hz.

I have run boxes at 38 Hz. There are songs that the low end will be missing. Make sure you have a subsonic filter set correctly.

How much port area do you have? I would cut down on port area if possible to lower the tuning to 33-34 Hz.

I have 40 sq. in of port will that do? Or will i have to rip my port out and redo it. I emailed a well know "audio dude" and he told me if i have such a small enclosure for that 15, if i tune the box to about 38Hz, the cab would do the rest. Guess i was an ass for actually believeing that chit. Dame.

He is talking about cabin gain. That will happen with all subwoofers.

yeh, but it isn't gonna do chit to help your tuning and allow the woofer to actually play the low-end...

So if i extend my port length about 3-4 inches i should be ok using a 3.1 cuft box presently tuned to 38hz?

Edited March 8, 200916 yr by wof131s

yeh, but it isn't gonna do chit to help your tuning and allow the woofer to actually play the low-end...

so youre saying if he has more port he can play lower freqs better?