8" Subwoofer box WITH spare tire

antennahead · 04-26-2009, 11:19 AM

Quote:

Originally Posted by JerryK

I'm upgrading my stock system with 6.5 components, amp and a subwoofer. I figure 8" is plenty for this car and my music preference. I wanted to keep the spare tire, so I looked for a sub with minimum box volume requirements. The 8" JL W6 only needs .375 cubic feet, so I fashioned a round box that fits down in the spare tire. It's 15" in diameter by 4.5" or so tall. I used a round tub I found at Lowes for a vessel to set dimensions for the fiberglass sides, the top and bottom are 5/8" MDF. I used epoxy resin with two thicknesses of mat and cloth. Epoxy resin is expensive, but it's strong and doesn't have that resin smell of the others. The carpet can go over the top, but I may cut it out and put a grill on it. Still working on the rest, hopefully it will be installed in two weeks.

A quick question. Is the top of your enclosure wide enough diameter wise to house one of the JL thinlines? The 13TW5 needs about 13 inches, the 12TW5 isn't listed on the websit yet, but probably needs about 12". The depth of these subs is only 2.5", and have gotten some good reviews. Thanks.

John

JerryK · 04-26-2009, 11:48 AM

Yes, the top of the fiberglass circular tub/box is about 14.75" inside diameter, the MDF top circle is 20". You could run either one. Check the cubic inches recommended for the enclosure, every inch of 15" diameter is 176 cubic inches. (There's 1728 cubic inches in a cubic foot.) 15" is the largest diameter that fits down in the spare on top of the hold-down nut of the tire, you could go smaller diameter if you need to. If you needed more cubes you could go another inch or so higher without crowding your trunk. Remember to subtract the volume of the subwoofer itself.

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04-26-2009, 11:48 AM	#2 (permalink)
JerryK Base Member Join Date: Mar 2009 Location: Scottsdale AZ Posts: 64 Drives: 2009 370Z Yellow 7AT Rep Power: 18	Yes, the top of the fiberglass circular tub/box is about 14.75" inside diameter, the MDF top circle is 20". You could run either one. Check the cubic inches recommended for the enclosure, every inch of 15" diameter is 176 cubic inches. (There's 1728 cubic inches in a cubic foot.) 15" is the largest diameter that fits down in the spare on top of the hold-down nut of the tire, you could go smaller diameter if you need to. If you needed more cubes you could go another inch or so higher without crowding your trunk. Remember to subtract the volume of the subwoofer itself.