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PA Top with AMT
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<blockquote data-quote="Moritz Bachmann" data-source="post: 213475" data-attributes="member: 13680"><p>Sorry that it took so long.. we got a little ill over here</p><p>Here are some measurements of the 12" and the 10". We did a lot of tests of different setting but it didn't change the frequency responds that much.</p><p>Especially the differences of the measurements of the 12" are not that big (and a worse low end).. We tried 35L, 30L and 25L volume boxes with tuning frequencies from 60Hz–80Hz each (this time in a distance of 30cm, centered between the speaker and the port).</p><p>The measurements of the 10" shows the changes of the tuning frequency much clearer, but it still doesn't play that low like we expected.</p><p>What can we do to achieve a better low end?</p><p></p><p>Also there is a cutoff around <a href="http://i.viglink.com/?key=5cf16c336e47fafee363278702686ee9&insertId=14fde8010922747a&type=H&exp=60%3ACI1C55A%3A5&libId=k5qnqft801012yw0000DA7c0xzsr1&loc=https%3A%2F%2Fsoundforums.net%2Fcommunity%2Fthreads%2Fpa-top-with-amt.211750%2F%23post-213475&v=1&iid=14fde8010922747a&out=https%3A%2F%2Fwww.amazon.com%2Fdp%2FB00OAD4AK4&ref=https%3A%2F%2Fsoundforums.net%2Fcommunity%2F&title=PA%20Top%20with%20AMT%20%7C%20Sound%20Forums&txt=%3Cspan%3E900Hz%3C%2Fspan%3E" target="_blank">900Hz</a>. But I think we didn't have these problems with other cabs, still it keeps us wondering.. (the cab is stuffed btw)</p><p></p><p>If we finally find the tuning frequency, we would adjust the port diameter that the 1st port resonance fq is not within the frequency range (which is 100hz-1000hz)? So something like 1200hz?</p><p></p><p>Thank you all <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p></p><p>[ATTACH=full]209075[/ATTACH]</p></blockquote><p></p>
[QUOTE="Moritz Bachmann, post: 213475, member: 13680"] Sorry that it took so long.. we got a little ill over here Here are some measurements of the 12" and the 10". We did a lot of tests of different setting but it didn't change the frequency responds that much. Especially the differences of the measurements of the 12" are not that big (and a worse low end).. We tried 35L, 30L and 25L volume boxes with tuning frequencies from 60Hz–80Hz each (this time in a distance of 30cm, centered between the speaker and the port). The measurements of the 10" shows the changes of the tuning frequency much clearer, but it still doesn't play that low like we expected. What can we do to achieve a better low end? Also there is a cutoff around [URL='http://i.viglink.com/?key=5cf16c336e47fafee363278702686ee9&insertId=14fde8010922747a&type=H&exp=60%3ACI1C55A%3A5&libId=k5qnqft801012yw0000DA7c0xzsr1&loc=https%3A%2F%2Fsoundforums.net%2Fcommunity%2Fthreads%2Fpa-top-with-amt.211750%2F%23post-213475&v=1&iid=14fde8010922747a&out=https%3A%2F%2Fwww.amazon.com%2Fdp%2FB00OAD4AK4&ref=https%3A%2F%2Fsoundforums.net%2Fcommunity%2F&title=PA%20Top%20with%20AMT%20%7C%20Sound%20Forums&txt=%3Cspan%3E900Hz%3C%2Fspan%3E']900Hz[/URL]. But I think we didn't have these problems with other cabs, still it keeps us wondering.. (the cab is stuffed btw) If we finally find the tuning frequency, we would adjust the port diameter that the 1st port resonance fq is not within the frequency range (which is 100hz-1000hz)? So something like 1200hz? Thank you all :) [ATTACH type="full" alt="Bildschirmfoto 2020-01-22 um 20.31.24 Kopie.png"]209075[/ATTACH] [/QUOTE]
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