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<blockquote data-quote="thch" data-source="post: 1800431" data-attributes="member: 562032">turn down the volume on the HU or the gains.&nbsp; your amp shouldn&#039;t be clipping at 1.4V.&nbsp; (you can also use 14V or anything else really).&nbsp; if you have the gains set, then it will make the most sense to adjust the HU.the reason for all of this is because 1.000V is -3dB down from 1.414V.&nbsp; so if the test tone normally creates a 1.414V signal at some frequency, then a filter will be affecting this signal by -3dB when the measured signal is 1.0V.&nbsp; that is, 1 is 70% of 1.4.&nbsp; 70% correspondes to -3dB.the alternative method is to play a 20-25hz test tone at full volume.&nbsp; set the SSF all the way at max.&nbsp; then lower the SSF frequency until the excursion reaches a point you concider to be excessive.&nbsp; this method has an advantage that is is actually relevant to the system and not based on some folk-lore &quot;5hz lower&quot; or &quot;1/3rd octave lower&quot; myth/method.&nbsp; it will not limit low frequency extension more then necessary, nor will it allow overexcursion.&nbsp; its also easy.</blockquote>

[QUOTE="thch, post: 1800431, member: 562032"] turn down the volume on the HU or the gains. your amp shouldn't be clipping at 1.4V. (you can also use 14V or anything else really). if you have the gains set, then it will make the most sense to adjust the HU. the reason for all of this is because 1.000V is -3dB down from 1.414V. so if the test tone normally creates a 1.414V signal at some frequency, then a filter will be affecting this signal by -3dB when the measured signal is 1.0V. that is, 1 is 70% of 1.4. 70% correspondes to -3dB. the alternative method is to play a 20-25hz test tone at full volume. set the SSF all the way at max. then lower the SSF frequency until the excursion reaches a point you concider to be excessive. this method has an advantage that is is actually relevant to the system and not based on some folk-lore "5hz lower" or "1/3rd octave lower" myth/method. it will not limit low frequency extension more then necessary, nor will it allow overexcursion. its also easy. [/QUOTE]

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