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Lanzar Opti 1535D, thoughts?
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<blockquote data-quote="audio_phill" data-source="post: 7098724" data-attributes="member: 605512"><p>Properly tuned bandpasses are flat, just not alot of subs like them very well, need a low EBP for decent freq response in 4th order BP</p><p></p><p></p><p>When you take into account how far above Fs tuning is, you realize that the vented side would need to be smaller than standard 4th order vented just to keep gain down and the response at as low of a ripple as possible lol. Go any bigger and there will be a very noticeable spike around tuning, go any smaller and you'll notice a loss below Fs that high qts woofers should not have when dealing with the slope made possible by the sealed chamber. Only thing WinIsd cannot be used for is to model the inductance spawned upper end natural roll-off and circle port calculations (since it figures everything in with aero style coefficients.</p></blockquote><p></p>
[QUOTE="audio_phill, post: 7098724, member: 605512"] Properly tuned bandpasses are flat, just not alot of subs like them very well, need a low EBP for decent freq response in 4th order BP When you take into account how far above Fs tuning is, you realize that the vented side would need to be smaller than standard 4th order vented just to keep gain down and the response at as low of a ripple as possible lol. Go any bigger and there will be a very noticeable spike around tuning, go any smaller and you'll notice a loss below Fs that high qts woofers should not have when dealing with the slope made possible by the sealed chamber. Only thing WinIsd cannot be used for is to model the inductance spawned upper end natural roll-off and circle port calculations (since it figures everything in with aero style coefficients. [/QUOTE]
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