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Old 9th August 2004, 11:05 PM   #1
95Honda is offline 95Honda  Germany
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Thought I would throw this in for you gys to check out. Here is an enclosure I'm building for a 99' Durango. 25 cubic feet ported @32Hz/200in2 vent, 6 Adire Tempest 15's and I'll be feeding it about 2kwrms....... I'll have it done this weekend.... I think I'll be looking at somewhere in the neighborhood of 150-152db.....
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Old 10th August 2004, 01:36 AM   #2
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Looks like it could turn out pretty nice . .. Please post a pic of the final project, and let us know how it performs .. . Keep up the good work ..
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Old 10th August 2004, 02:52 AM   #3
Stocker is offline Stocker  United States
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uh...

um...

seems like an awful low number for so much speaker...

but then, the power is a little low as well...

Still, plenty loud enough to hurt you.
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Old 10th August 2004, 06:35 AM   #4
Chupa is offline Chupa  United States
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i hope its gona be a show car and not rec driving
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Old 10th August 2004, 08:03 AM   #5
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According to my math and experience (which in my opinion is just as good or better than the math) you will hit around 147db, 148 if your lucky. If you want to go higher you will need considerably more power, even with the relatively high efficiency of the subs.

Your enclosure design isn't really ideal for SQ or SPL IMHO. Its kinda sitting in the middle and will never come close to achieving either. The 4.16cu.ft your giving each sub is WAY to small for the tempest in either application. Because of the large enclosure required by the tempest its not very well suited for car audio use.

If I had your setup I would shoot for SQ because the SPL results with only 2000 watts is not that impressive for 6 15s.

Here is my suggestion for an "SQ" ported box (its gonna be HUGE, but the tempest wasn't designed for the limited space of a vehicle.........

Box size: 45-50cu.ft, Fb: 18-20hz. You can go with the 200sq.in of port if you want, which would be around 19.5" with a 50cu.ft box tuned to 18hz. With 2000 watts it will yield a peek vent air velocity of about 14m/s @ 14hz.
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Old 10th August 2004, 02:55 PM   #6
95Honda is offline 95Honda  Germany
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hmmm, math and experience.... OK, here is a box I built last month in a 72 Chevelle with 6 sealed Tempests with 2ft each, and about 2000 wrms (two of the original Rockford power 1000 mosfets amps) Bangs 149 all day long at 50Hz...... Sealed.....
at the headrest....... No BS..... A buddy of mine has 4 Tempest and 1000 watts in a S10 pickup with a similar box alingment and hit 150.6 legal on a termpro in Tennesse.....

Remember you can plug stuff into the computer all day long, but actually doing it is something completely different.....

This stuff is fun though, isn't it?
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Old 10th August 2004, 02:57 PM   #7
95Honda is offline 95Honda  Germany
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Oh yeah, daily driver..........
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Old 10th August 2004, 05:30 PM   #8
95Honda is offline 95Honda  Germany
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Here is the box installed in the truck. I just got done putting 2 coats of epoxy resin inside the entire enclosure to seal any small leaks, stiffen up walls, and dampen a bit. Tonight I will spray another coat of paint inside the port, fill the screw holes, and carpet the front.... It barely fit in the truck! It went in in two pieces which were then Gorilla glued and reinforced with an additional 3/4" layer of MDF on the inside....
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Old 10th August 2004, 06:27 PM   #9
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Quote:
A buddy of mine has 4 Tempest and 1000 watts in a S10 pickup with a similar box alingment and hit 150.6 legal on a termpro in Tennesse.....
I use the new termpro "sensor mics"on a daily basis and find that statement EXTREMELY hard to believe. I'm not calling you a liar, but thats not even possible with 1000 watts.

I have a friend who owns a walled off caravan with 4 Atomic SPL subs and 2 4000watt rms Visonik amps, and he does a "legal" 152.5db.

Now, if I do more of that math stuff, thats only 1.9db louder than your friend. Since they are both using 4 15s(efficiencies aside) that would mean with the "magic" of your Friends setup he would only need a little less than 700 watts more to do 152.5db.

If that were true, that would mean my friend is "wasting" nearly 6300 watts of power on speaker inefficiencies,cabin losses, etc. . I don't think so.
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Old 10th August 2004, 06:44 PM   #10
95Honda is offline 95Honda  Germany
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Here is his link-

http://www.visionaryaudio.com/black00.html

Should answer any questions you have...........
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