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  #1  
Old 11-19-2014, 10:59 AM
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Default Dats an fourth question

Building a fourth for my tahoe I ran dats on sealed section no loading wall sealed up.. Well freq was low so I shrunk box down freq didn't change in fact it went a lil lower if anything .. Have any of u experienced this
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Old 11-19-2014, 11:05 AM
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I can't help, but post some pics of install
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Old 11-19-2014, 11:12 AM
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how low is it
how many subs/size
sealed section size

ive used dats in my 4th
make sure your sealed section has NO air leaks. you must also make sure that the wall is SEALED from rear (b pillar/cpillar no air should escape cabin)

Last edited by Nate Futuristic; 11-19-2014 at 11:15 AM.
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Old 11-19-2014, 02:20 PM
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What have you tested sweep?

Good Luck,

Kindest Regards.
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Old 11-19-2014, 08:07 PM
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Yes sweep ., would box leaking a lil cause miss reading I mean from wire holes etc
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Old 11-19-2014, 09:08 PM
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Would lean more toward leaking around around the enclosure. Also make sure to zero out the leads prior to use. Can throw it off as well. Good luck.
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Old 11-19-2014, 09:15 PM
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Any leaks will throw sealed resonance off a little. The best way to double check is to pull tsps free air and then use the equation to solve for sealed resonance with those tsps. Also, make sure to calibrate the leads every time you use dats or your readings will be off. Temperature will also effect the readings so if you sweep on a cold day and then change things and its 10 warmer the next time you sweep it will throw things off a bit. Increasing sealed side will lower resonance and shrinking it will raise it, if it is going down while shrinking then you either had a faulty reading to begin with or are currently getting a faulty reading.
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Last edited by e46inperrycounty; 11-19-2014 at 09:17 PM. Reason: clarification
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Old 11-19-2014, 09:26 PM
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Ok thanks guys I'll calibrate with 1 k resistor? An I'll test again
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Old 11-19-2014, 11:53 PM
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Post up the graph if you can. Leaky or resonant enclosures usually show up as "squigglies" in the impedance, unless there's a really large leak which might change resonance. Also please post specs for the subs if possible.
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Old 11-20-2014, 12:25 AM
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The shell will affect the frequency response even if no loading wall. Test the sub is same sized enclosure in open environment.
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