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<blockquote data-quote="n2audio" data-source="post: 8524779" data-attributes="member: 540940">Well, w/o all that bloat at ~40 you&#039;re losing a lot of energy.&nbsp; That doesn&#039;t make it bad or wrong, it&#039;s just not what you&#039;re used to.The frequency doesn&#039;t make much difference as long as it&#039;s somewhere in the middle of the sub&#039;s range.&nbsp; The only explanation I&#039;ve ever come across for using 60hz is that typical DMM&#039;s are calibrated for 60hz (home electricity).&nbsp; Maybe so, but at that point you&#039;re really splitting hairs.The reference level makes a LOT of difference.&nbsp; A -3db tone contains half the power of a 0db tone.I&#039;ve done by ear vs by dmm comparisons as well.&nbsp; I&#039;ve come out surprisingly close.I wouldn&#039;t set the lpf that high, but it&#039;s personal choice and has a lot to do with the capability of your front stage.ISF is enclosure dependent, but 25 is going to be reasonable regardless.&nbsp; If your box is sealed there&#039;s really no need for the ISF.&nbsp; If it&#039;s ported it&#039;s supposed to be set a few hz below the box&#039;s tuning frequency.</blockquote>

[QUOTE="n2audio, post: 8524779, member: 540940"] Well, w/o all that bloat at ~40 you're losing a lot of energy. That doesn't make it bad or wrong, it's just not what you're used to. The frequency doesn't make much difference as long as it's somewhere in the middle of the sub's range. The only explanation I've ever come across for using 60hz is that typical DMM's are calibrated for 60hz (home electricity). Maybe so, but at that point you're really splitting hairs. The reference level makes a LOT of difference. A -3db tone contains half the power of a 0db tone. I've done by ear vs by dmm comparisons as well. I've come out surprisingly close. I wouldn't set the lpf that high, but it's personal choice and has a lot to do with the capability of your front stage. ISF is enclosure dependent, but 25 is going to be reasonable regardless. If your box is sealed there's really no need for the ISF. If it's ported it's supposed to be set a few hz below the box's tuning frequency. [/QUOTE]

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