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<blockquote data-quote="bbeljefe" data-source="post: 8146135" data-attributes="member: 655960">If the specs on the woofers you have are anything like the IDMAX 15, they have an EBP of about ~39, which is great for sealed and 4th order. If they&#039;re like the IDQ, then EBP is ~69, which is a little better suited for ported and 6th order.Of course, being a custom built sub, you&#039;d have to have access to a DATS or you&#039;d have to spend some time pulling the TS numbers manually in order to know for sure.As for the box, the 1:2 ratio is fine and the tuning sounds fine too, although I&#039;d want to tune it closer to Fs.... whatever that may be. However, being a 15, I would assume it&#039;s below 30hz, so I&#039;d want to be around 32-4hz. But that&#039;s subjective, unless the speakers won&#039;t perform well in that box at that tuning. Again...need TS.Bracing with ½&quot; all thread is fine for short dimensions but if you get past 20&quot; or so, I&#039;d be afraid the ½&quot; would be too thin to resist inward pressures. For longer braces, I&#039;d use 3/4&quot; and the biggest fender washers I could find. The last thing you want is a brace in the box resonating like a guitar string.</blockquote>

[QUOTE="bbeljefe, post: 8146135, member: 655960"] If the specs on the woofers you have are anything like the IDMAX 15, they have an EBP of about ~39, which is great for sealed and 4th order. If they're like the IDQ, then EBP is ~69, which is a little better suited for ported and 6th order. Of course, being a custom built sub, you'd have to have access to a DATS or you'd have to spend some time pulling the TS numbers manually in order to know for sure. As for the box, the 1:2 ratio is fine and the tuning sounds fine too, although I'd want to tune it closer to Fs.... whatever that may be. However, being a 15, I would assume it's below 30hz, so I'd want to be around 32-4hz. But that's subjective, unless the speakers won't perform well in that box at that tuning. Again...need TS. Bracing with ½" all thread is fine for short dimensions but if you get past 20" or so, I'd be afraid the ½" would be too thin to resist inward pressures. For longer braces, I'd use 3/4" and the biggest fender washers I could find. The last thing you want is a brace in the box resonating like a guitar string. [/QUOTE]

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