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<blockquote data-quote="dt053" data-source="post: 6522775" data-attributes="member: 590704">A few things to try... but sorry not a pro.Make sure your amp isn&#039;t clipping... your system is more efficient around the tuning frequencies... check it with a O scope.Have you tried closing the port and seeing if it still distorts?When the sub unloads, can you tell if it seems to move in one direction more than another?Have you swept it with test tones and watched the reaction as you move up in frequency... is there a frequency where is stops?With frequencies above the tuning frequency, can you push the sub inward and have it lock into that position?What I&#039;m getting at is:&nbsp; does the sub have a dynamic DC offset?The DC offset could be caused by something as simple as the port geometry... Remember the sub will pull in air not only from right in front of the port but also the sides. which causes the air velocities to be different...( a very good reason to flare or radius a port) this also happens on the inside of the enclosure.&nbsp; If the sub pulls, or pushes air differently, then a DC offset is created and the sub can move more in one direction than another... the harder you drive it the worst it can get.... as the port becomes more restricted when it you try to push more air through it the tuning can change.If the VC is off center it can cause a DC offset, and if the suspension isn&#039;t linear it can cause the sub to move to it&#039;s minimal during operation.Not sure if any of this is your problem but putting my 2cents out here.dT</blockquote>

[QUOTE="dt053, post: 6522775, member: 590704"] A few things to try... but sorry not a pro. Make sure your amp isn't clipping... your system is more efficient around the tuning frequencies... check it with a O scope. Have you tried closing the port and seeing if it still distorts? When the sub unloads, can you tell if it seems to move in one direction more than another? Have you swept it with test tones and watched the reaction as you move up in frequency... is there a frequency where is stops? With frequencies above the tuning frequency, can you push the sub inward and have it lock into that position? What I'm getting at is: does the sub have a dynamic DC offset? The DC offset could be caused by something as simple as the port geometry... Remember the sub will pull in air not only from right in front of the port but also the sides. which causes the air velocities to be different...( a very good reason to flare or radius a port) this also happens on the inside of the enclosure. If the sub pulls, or pushes air differently, then a DC offset is created and the sub can move more in one direction than another... the harder you drive it the worst it can get.... as the port becomes more restricted when it you try to push more air through it the tuning can change. If the VC is off center it can cause a DC offset, and if the suspension isn't linear it can cause the sub to move to it's minimal during operation. Not sure if any of this is your problem but putting my 2cents out here. dT [/QUOTE]

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