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<blockquote data-quote="Immacomputer" data-source="post: 4903903" data-attributes="member: 570419">Bullshit. 20hz and below is completely audible in my car and 20hz is not attenuated at all. I&#039;m also just running a single 12&quot; sub getting 100w from an old Profile amp. Bass I love you sounds very flat and nice on my setup. The 7hz quick note is definitely audible and it&#039;s not some flapping sound from the driver. The 17hz note is very powerful and really gets my shirt shaking.If you want to get down to 20hz and still use a sealed box, I suggest going to about 2.5 cubes and implementing a Linkwitz transform circuit into your system if you have plenty of power at your disposal (or if you&#039;re not too terribly concerned with output).Another option would be to go to about 2.5 cubes and tune between 22-25hz. That would definitely bring out the low end extension and your top end should not change much at all from how they are now. That will have roughly the same output from about 40-60hz that you get now but it should also bring the 20-40hz range into a more audible level and no, that does not mean that it will be peaky. Being peaky in the low 20hz range isn&#039;t a bad thing at all since your hearing starts to roll off around there. My hearing begins to degrade around 25hz and below and I have a 4dB peak at 22hz. To my ear, it&#039;s not a noticeable peak and it actually sounds flat when compared to frequencies in the 30+ range.A transmission line may also suit your needs. Something with about 45in^2 of line area at about 110&quot; long with a small compression chamber of about .5 cubes or so. I would probably steer clear of this option if you have a trunk vehicle though.</blockquote>

[QUOTE="Immacomputer, post: 4903903, member: 570419"] Bullshit. 20hz and below is completely audible in my car and 20hz is not attenuated at all. I'm also just running a single 12" sub getting 100w from an old Profile amp. Bass I love you sounds very flat and nice on my setup. The 7hz quick note is definitely audible and it's not some flapping sound from the driver. The 17hz note is very powerful and really gets my shirt shaking. If you want to get down to 20hz and still use a sealed box, I suggest going to about 2.5 cubes and implementing a Linkwitz transform circuit into your system if you have plenty of power at your disposal (or if you're not too terribly concerned with output). Another option would be to go to about 2.5 cubes and tune between 22-25hz. That would definitely bring out the low end extension and your top end should not change much at all from how they are now. That will have roughly the same output from about 40-60hz that you get now but it should also bring the 20-40hz range into a more audible level and no, that does not mean that it will be peaky. Being peaky in the low 20hz range isn't a bad thing at all since your hearing starts to roll off around there. My hearing begins to degrade around 25hz and below and I have a 4dB peak at 22hz. To my ear, it's not a noticeable peak and it actually sounds flat when compared to frequencies in the 30+ range. A transmission line may also suit your needs. Something with about 45in^2 of line area at about 110" long with a small compression chamber of about .5 cubes or so. I would probably steer clear of this option if you have a trunk vehicle though. [/QUOTE]

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