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polk MM 10s ported, is this right?
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<blockquote data-quote="SpeedEuphoria" data-source="post: 6973638" data-attributes="member: 623992"><p>the 18" length is the total length of the port</p><p></p><p>so the 10.75" and then the 7.25"=18" port length</p><p></p><p>but the re calc measures it off the back and side so it shows as 21.75" port length. If you cut that down like the 2nd pic so that RE calc shows 18" port length the tuning will be ~2hz higher or 38hz(then ~2hz more due to subs, read below)</p><p></p><p>They are recommending higher then 36hz as when you minus the subs displacement it makes the box smaller and the tuning higher by ~2hz.</p><p></p><p>So they are either recommending 38hz or 40hz depending on which way they measure the port length</p></blockquote><p></p>
[QUOTE="SpeedEuphoria, post: 6973638, member: 623992"] the 18" length is the total length of the port so the 10.75" and then the 7.25"=18" port length but the re calc measures it off the back and side so it shows as 21.75" port length. If you cut that down like the 2nd pic so that RE calc shows 18" port length the tuning will be ~2hz higher or 38hz(then ~2hz more due to subs, read below) They are recommending higher then 36hz as when you minus the subs displacement it makes the box smaller and the tuning higher by ~2hz. So they are either recommending 38hz or 40hz depending on which way they measure the port length [/QUOTE]
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polk MM 10s ported, is this right?
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