I have an 89 Mercury Tracer, I have 7.7 cubic ft (internal volume) {39 in W, 23 in H, 18 in D} I would like the box to be tuned to about 32 HZ. I will be running about 3500 watts to the sub. any help would be appreciated, I do not know that much about tuning an enclosure.

I have an 89 Mercury Tracer, I have 7.7 cubic ft (internal volume) {39 in W, 23 in H, 18 in D} I would like the box to be tuned to about 32 HZ. I will be running about 3500 watts to the sub. any help would be appreciated, I do not know that much about tuning an enclosure.

http://mobile.jlaudio.com/support_pages.php?page_id=165

Someone else refered me to this link. If you know much about math this will help you out and be much more accurate than most online calculators.

http://www.carstereo.com/help/Articles.cfm?id=31

I've also used this calculator numerous times to make short work of it, although it can give varied results. Never had a box turn out bad using it, but I have had them turn out tuned slightly off of what I wanted.

how were you planning on configuring the sub/port (i.e: putting the sub up port back, sub up port up, etc..).

I have an 89 Mercury Tracer, I have 7.7 cubic ft (internal volume) {39 in W, 23 in H, 18 in D} I would like the box to be tuned to about 32 HZ. I will be running about 3500 watts to the sub. any help would be appreciated, I do not know that much about tuning an enclosure.

Box is right at the minimum size you need.

You could build a slot port on one side. 21.5" x 4" x 25". It would extend into the box to 4" from the back wall and then extend 7" further along the back wall. Net is 6 ft tuned to 33 hz.

Add a couple of bracing strips on each side of the woofer mounting hole.

Brian