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Old 11th February 2016, 02:42 AM   #1
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Default Adjust Cubic Air Volume?

Hello all! This is my first post to this forum and I should also say I'm not an audiophile by any definition so don't get too technical on me. I bought a new truck with a regular cab and the sound system is terrible so I have decided to add two subwoofers to a professional prefabricated box to place behind the seats. The box fits nicely and looks great and I really want to use it. However, the subwoofers that I want to use have a recommended .35 to .7 cubic air volume inside each chamber. According to the manufacturer, the box chambers are .77 cubic feet of air. What can I do, or should do if anything, to get the cubic air space down to somewhere between .35 and .7 (.55?)? When I get all my equipment in, I plan to take it to a professional car stereo installer and have them hook up everything. I've never used a professional car audio installer before so can they adjust (tune) the cubic air volume of my box for me? Maybe I'm worry about something that is not a real issue but I don't know how significant .7 over the recommended cubic air volume is and how, if any, it affects speaker performance. I hate to go to all this expense and effort and have some simple matter that might significantly affect the performance of my equipment. I would appreciate any advice on this matter. Thanks in advance!
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Old 11th February 2016, 02:55 AM   #2
Ron E is online now Ron E  United States
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holy wall of text batman!
0.77 will work fine, don't worry about it, don't bother trying to reduce volume as extra volume won't hurt.
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Old 11th February 2016, 02:57 AM   #3
GM is offline GM  United States
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Without knowing all the particulars, i.e. driver, box, specs and whether or not this 'system' has been optimized for your truck, I recommend leaving it at this ~10% too large since historically, typical mobile audio cab alignments ideally need larger cabs. Worst case, you can glue in wood scraps or similar to reduce its net Vb [internal cab volume], but I would be very surprised if you could hear any obvious difference since our hearing acuity down in the [sub] bass is very poor.

Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
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Old 11th February 2016, 03:09 AM   #4
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Are these sealed or ported boxes? Either way add some poly fill for damping. If they are ported leave the damping away from the port by about 4-5 inches. Don't worry about the extra volume (or get a bigger speaker). Your installer will know what to do, don't worry about it. Your not going to want to stop with the subs. A new head unit and front speakers will help out tremendously. Of course you will need the proper amps too. Enjoy!
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Old 11th February 2016, 04:31 AM   #5
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Hi Keith,

I totally agree with Ron and GM. By the time you subtract the driver displacement you should be close to .7cuft with it mounted in the box. For car audio, if I have the space to build the box bigger I will always build bigger. I have built boxes on the small side, and didn't care for the sound at all. I have built boxes with a Qtc of .5, which was about 3 times larger than the manufacturer recommended, and it sounded great. Did I mention bigger is better. Anyways, hopefully this was helpful.

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