How can i find resonant frequency ??

[Johnny Law.Lulz 5,000+ posts]

I want to know what the resonant frequency of my truck is. I knew where ti peaked with my old system but thats it. My truck is a 1989 F-150 Standard cab.

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[S1R-BLUNTZWORTH 10+ year member]

i dunno probably with a freq test cd and a termlab. maybe free-air the sub when doing this?? or maybe listen for the most rattles during a sine sweep if you can't find a t-l:laugh:

 

[pr-festiva 10+ year member]

your gonna need a spl meter of some sort and a test disc. rattles wont tell you what the peak of the truck is.

 

[soundstreamer 10+ year member]

You'll need a termlab so you can use it's RTA, and a CD/MP3 with a slow sweep + individual tracks with sub frequencies.

You run a slow sweep and the RTA will show where you got your highest score. Burp the frequencies in that area until you find which one is loudest with a straight tone.

Some vehicles have multiple peaks. They can all be found, but one is usually louder than the others.

 

[Skip01 5,000+ posts]

Sealed box and TL.

Play 30hz to 60hz and write down all the meterings and the loudest is pretty close too ur resonant frequency.

Make sure to do this with no other subs in truck too.

 

[djarmy2004 10+ year member]

will the cd from usaci finals work for this??? just wondering as i need to do this also

 

[Johnny Law.Lulz 5,000+ posts]

I am thinking of buying a Term lab, but my peak frequency with my E8's in the truck was 49. Does that mean anything or was that just for that set-up. Ive done major interior alterations since then.