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<blockquote data-quote="GregU" data-source="post: 5623690" data-attributes="member: 604755">On monday I&#039;m going to meter my SE12. From experiance I think I should be doing a little more than what I am, although I am tuned pretty low(27hz) and on low wattage(500rms), but here&#039;s the thing, I&#039;m peaking at around 40hz..... This is my first hatchback(Scion TC). My hatch was flexing so much I rigged up tie downs to hold it down, if it&#039;s held down too tight nothing sounds good, if it&#039;s held down not tight enough I loose my lows(30hz and under) but I gain at around 35hz and up. I&#039;m pretty sure I&#039;m having some issues caused by the car itself and sympathetic vibration. If I measure SPL at the port and at the dash taking the difference between the two, would that tell me if it&#039;s the car itself I&#039;m having difficulties with or the sub/enclosure? In other words, purley an example, say I made 150db at the port and only 120db at the dash, wouldn&#039;t that tell me that there&#039;s an issue with the install/car and not the sub/enclosure?Any help or ideas would be appriciated.P.S. i know that it could be because I&#039;m tuned so low, but please remember the actual question that I&#039;m asking(In bold)//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif If i had to guess I&#039;d say I&#039;m making about 130db at the headrest.</blockquote>

[QUOTE="GregU, post: 5623690, member: 604755"] On monday I'm going to meter my SE12. From experiance I think I should be doing a little more than what I am, although I am tuned pretty low(27hz) and on low wattage(500rms), but here's the thing, I'm peaking at around 40hz..... This is my first hatchback(Scion TC). My hatch was flexing so much I rigged up tie downs to hold it down, if it's held down too tight nothing sounds good, if it's held down not tight enough I loose my lows(30hz and under) but I gain at around 35hz and up. I'm pretty sure I'm having some issues caused by the car itself and sympathetic vibration. [B]If I measure SPL at the port and at the dash taking the difference between the two, would that tell me if it's the car itself I'm having difficulties with or the sub/enclosure? In other words, purley an example, say I made 150db at the port and only 120db at the dash, wouldn't that tell me that there's an issue with the install/car and not the sub/enclosure?[/B] Any help or ideas would be appriciated. P.S. i know that it could be because I'm tuned so low, but please remember the actual question that I'm asking(In bold)[IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] If i had to guess I'd say I'm making about 130db at the headrest. [/QUOTE]

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