141@34hz on a 3K? I NEED HELP! - Car Audio Classifieds!
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Old 03-31-2013, 09:04 PM
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Default [email protected] on a 3K? I NEED HELP!

I made this box for a couple of 12". 4.3 cubes with 8" aero, 21.5" length tuned to 32ish. After an initial test I ran some all-thread top-bottom to brace it. Test fit in car



Sundown 3k @ 1 ohm. Getting a good underhood battery this week, Already running a dc power 270xp.

Did some lower power sweeps/tones tl metering w/ pair of SA12's & stiff-ass BTL N2's. SA12's were more flat response and louder. BTL peaked 2db higher in the 29-32hz but were down 4-5db by 35-40hz. So did the rest of the testing with sa12's. Assuming the BTL's need at least 2x more power and some more play time to break in.

I shoved some pillows in between the box and the car to "seal" it off. LOL. Gained 2db between 25-35hz. So if I actually sealed it off and rear deck I'm sure I'd gain more. I took the external part of the port off, which raised tuning to 37 hz. sounded like crap. Only gained about a db @ 40hz.

Best I could get was a 141.3 @ 34 hz. I know from a few other builds in the same body style camry I have that they meter like crap. But this seems pretty low.

I need pointers as to what I can do to my box or what to try with the next box. I'm not really wanting to just scrap this box but would be more than willing to build another.

I had a 15" sp4 rear firing and 8" aero to the side in this car last fall. Did about the same peak, 142 but rattled the car to shit. Would like to stick with dual 12's and forward firing and seal it off.
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Old 03-31-2013, 09:11 PM
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maybe pm terry brocks as that looks similar to one he uses in his civic.
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Old 03-31-2013, 09:15 PM
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Put some scrap in the box to shrink the volume down to 3 cubes for the SA's and test again
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Old 03-31-2013, 09:17 PM
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You might have crazy rise
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Old 03-31-2013, 09:19 PM
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Originally Posted by B-Shot View Post
Put some scrap in the box to shrink the volume down to 3 cubes for the SA's and test again
That'd raise the tuning 38ish. I do have a longer aero I could put in to bring it back to 34hz, but I'd have to shove the box way back in the trunk, or leave seats down all the time.
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Old 03-31-2013, 09:19 PM
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The thing that terry told me about trunks is that they have be soild. Heavy and deaden like no other. His trunk in his car is like a brick. Also the kind of set up he has is not good on music at all and he will tell u that. My girl hit a 143 with 2 12 h2 orions on a dd 1k. On a flat sealed off ported trunk wall pretty much. i did a board above after.


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Old 03-31-2013, 09:20 PM
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You might have crazy rise
Very possible. I might get try and clamp it this week to figure out where it's at.
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Old 03-31-2013, 09:26 PM
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The thing that terry told me about trunks is that they have be soild. Heavy and deaden like no other. His trunk in his car is like a brick. Also the kind of set up he has is not good on music at all and he will tell u that. My girl hit a 143 with 2 12 h2 orions on a dd 1k. On a flat sealed off ported trunk wall pretty much. i did a board above after.


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seems to me like you are wanting numbers more than music anyway so why not tune higher? you can still play music, just not the low stuff. i know about terry setup. he is a former teammate. i don't compete anymore.
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Old 03-31-2013, 09:32 PM
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I want to stay tuned to 32-34. I do NOT want a burp box. Most of the stuff I listen to is 28hz and up.

I am not expecting 2 12"s to do massive hair tricks or 160db. Just looking for tips/pointers on how to make this more efficient and still be tuned low. Maybe that's asking too much from the equipment/car I already have.
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Old 03-31-2013, 09:37 PM
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your vehicle probably like the higher bass like mine does. i did a 150 with a single 12" in a 35hz tuned box but didn't care about numbers so i did 2 12"s in a 28 hz tuned box knowing it would hurt my score and it dropped like a stone 4 db's. the 34hz you want might be hurting you alot.
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