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<blockquote data-quote="datman" data-source="post: 8370192" data-attributes="member: 664973">I recently installed 2 10&quot; subwoofers in my 2007 f150.&nbsp; since there is limited room I had to go with a box with 2 ft3 of airspace combined (1 ft3 per sub) at low volumes, it sounds really good, but at&nbsp; mid/high volumes, the quality of the lows really suffers-so here&#039;s what&#039;s happening.I wish I could explain whats happening better, but i&#039;ll try anyway.&nbsp; when listening to it at low volume the low notes sound as they should.&nbsp; as the volume increases, so does the frequency seem to increase (the same note seems higher than before)so Here&#039;s what my research has brought me to-As I see it I have 2 options, attempt to fill the box with polyfill, or to port it, port length calculator suggests 2&quot;x4&quot; port , but my box is only 5.5&quot; tall... below it shows a much larger port is needed..here&#039;s the recommended specs from the company on enclosure sizePort Frequency: Small = 47 Hz; Large = 45 HzPorted Enclosure: Small = 0.8 CuFt; Large = 1.2 CuFtSealed Enclosure: Small = 0.6 CuFt; Large = 1.2 CuFtPort Diameter: Small = 3 &quot;; Large = 4 &quot;Mounting Hole Diameter: 9316&quot;Port Length: Small = 8.5 &quot;; Large = 11 &quot;Dimensions (H x L x W): : 4.02&quot; x 10.55&quot; x 10.55&quot;suggestions?</blockquote>

[QUOTE="datman, post: 8370192, member: 664973"] I recently installed 2 10" subwoofers in my 2007 f150. since there is limited room I had to go with a box with 2 ft3 of airspace combined (1 ft3 per sub) at low volumes, it sounds really good, but at mid/high volumes, the quality of the lows really suffers- so here's what's happening. I wish I could explain whats happening better, but i'll try anyway. when listening to it at low volume the low notes sound as they should. as the volume increases, so does the frequency seem to increase (the same note seems higher than before) so Here's what my research has brought me to- As I see it I have 2 options, attempt to fill the box with polyfill, or to port it, port length calculator suggests 2"x4" port , but my box is only 5.5" tall... below it shows a much larger port is needed.. here's the recommended specs from the company on enclosure size Port Frequency: Small = 47 Hz; Large = 45 Hz Ported Enclosure: Small = 0.8 CuFt; Large = 1.2 CuFt Sealed Enclosure: Small = 0.6 CuFt; Large = 1.2 CuFt Port Diameter: Small = 3 "; Large = 4 " Mounting Hole Diameter: 9316" Port Length: Small = 8.5 "; Large = 11 " Dimensions (H x L x W): : 4.02" x 10.55" x 10.55" suggestions? [/QUOTE]

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