sub freq' change help

[mecaspl151 10+ year member]

i went to a comp last week and my car peeked at 34 hz and did 150's and i went this week and did a sweep and my car peeked at 42hz and could only do a 148 and i did not mess with anything i checked the subs they still read 0.5ohms nothing looked burnt spyders all looked good so what would couse this? any help please

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[treadburner 10+ year member]

what mic was it on?

 

[d-REW 10+ year member]

must be a tl if your seeing a HZ range? i don't think the ac shows that. whats your electrical look like maybe batts were low? also was it hot or cold out some of these can change the score slightly not much though. did you try to burp a 34 again or just run a sweep? also was the mic in the same location both times?

 

[mecaspl151 10+ year member]

yea i did a 34 hz and then the 42hz it was only 15degress hotter at this show but it was on a mountan and on my back batts the wires were a little loose ive tighten them up now but would all this couse a 2db drop from the previs week oh and it was on a tl and at this weeks show they moved the seat up as far as it would go but they metor at the headreast for meca

 

[treadburner 10+ year member]

if your voltage was lower it could cause the drop

 

[Immacomputer 10+ year member]

The change in altitude will have a very large effect on the cabin properties and very well could change your peak frequency and peak output.