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Old 04-14-2016, 09:12 AM
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Default Vehicle Resonant Frequency

So guys I was wondering if anyone knows of away to raise a vehicles resonant frequency.
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Old 04-14-2016, 09:42 AM
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How much are we talking? Increasing rigidity will raise the resonance of a panel however the added mass usually required to increase rigidity lowers resonance some. Best bet is to try glass and use the lightest mat material you can. Will increase rigidity without adding a ton of mass. Another option would be welding in lightweight plates of aluminum or a cross hatch of steel strips to kill resonance at lower frequencies. Think of body panels like the soft parts of a woofer and it will all make more sense.
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Old 04-14-2016, 11:00 AM
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Quote:
Originally Posted by e46inperrycounty View Post
How much are we talking? Increasing rigidity will raise the resonance of a panel however the added mass usually required to increase rigidity lowers resonance some. Best bet is to try glass and use the lightest mat material you can. Will increase rigidity without adding a ton of mass. Another option would be welding in lightweight plates of aluminum or a cross hatch of steel strips to kill resonance at lower frequencies. Think of body panels like the soft parts of a woofer and it will all make more sense.
My issue is that my single cab truck no matter what setup goes in it or what tuning I do ends up with a peak on the meter of 29-30 hz which is working so well for me.
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Old 04-14-2016, 01:39 PM
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Buy an older s10.
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Old 04-14-2016, 03:37 PM
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Buy an older s10.
That kind of defeats the purpose of building one of the loudest single cabs out there.
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Old 04-14-2016, 05:38 PM
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Waiting for a old friend to email me back, he had a single cab 3gen ram, removed the bench seat and put in two harwood racing seats (fiberglass(IIRC) and peaked in the low 40's
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Old 04-14-2016, 05:39 PM
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What single cab do you have, and what is your setup? How are you metering, outlaw style or sealed on the dash? A fullsize single cab should have a resonant frequency way up into 60's if not higher. A conversion van or a Suburban is what would be near 30hz. Back in my SPL days, I had my single cab Ram with a burp box tuned to 58hz and IIRC the resonance I measured of the cab was like 66 or 68hz.
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Old 04-14-2016, 05:44 PM
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Quote:
Originally Posted by hurrication View Post
What single cab do you have, and what is your setup? How are you metering, outlaw style or sealed on the dash? A fullsize single cab should have a resonant frequency way up into 60's if not higher. A conversion van or a Suburban is what would be near 30hz. Back in my SPL days, I had my single cab Ram with a burp box tuned to 58hz and IIRC the resonance I measured of the cab was like 66 or 68hz.
It's a 2004 dodge ram 1500. Setup last year was so how IA warden 15 in a 6.5 cube net enclosure tuned at 36. Power was 4 I clamped. Truck did a [email protected] I've done the test with the sealed enclosure to find the resonant frequency. That test yielded 41 hz peak sealed in the dash, 40 hz sealed at the head rest. The moment I opened the door it dropped to 31 hz. I compete in Meca so we meter door open at the headrest.
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Old 04-14-2016, 05:51 PM
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Gotchya. If you're metering with the door open, I'm not sure that there's anything you can do to change the resonance very much. Or if there is, it's above what I know.
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Old 04-14-2016, 05:56 PM
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Quote:
Originally Posted by hurrication View Post
Gotchya. If you're metering with the door open, I'm not sure that there's anything you can do to change the resonance very much. Or if there is, it's above what I know.
Yeah it sucks trying to get big numbers in a single can when you peak at 29-30hz.
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