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<blockquote data-quote="hispls" data-source="post: 8748231" data-attributes="member: 614752">That is very dependent on the subs and response will be quite sensitive to a lot of variables in the box even if it models OK.&nbsp; I have seen several failures in person of guys trying to do bandpass and played with 4th order myself back when it was first a meme in the early/mid 90s.&nbsp; The real issue is that almost invariably by the time you flatten out the bandwidth to be usable for music listening you will lose all the &quot;ripple&quot; gains you would have got.&nbsp;&nbsp; For example I did a 4th order in a 1980 Town Car ages ago to port up through the rear deck and it sounded nice but was basically just sealed box performance with the only benefit being a good way to get all the sound up front.&nbsp;&nbsp; The subs I used modeled particularly well for that alignment and were very fairly priced at Circuit City at the time.&nbsp;&nbsp; Seen a couple big wall builds up here local that sounded good but weren&#039;t very impressive on the meter for their power and cone area (one of those guys switched to just a flat wall and is now doing strong numbers) and saw a couple 6th order attempts that were complete failures and were quickly scrapped.&nbsp; Again, most important is run your specs through some modeling software and see if you can get anything that looks useful and do make certain you have some kind of plan on how you can easily modify volumes and port area/tuning all around if it doesn&#039;t work out the gate or even after several revisions.</blockquote>

[QUOTE="hispls, post: 8748231, member: 614752"] That is very dependent on the subs and response will be quite sensitive to a lot of variables in the box even if it models OK. I have seen several failures in person of guys trying to do bandpass and played with 4th order myself back when it was first a meme in the early/mid 90s. The real issue is that almost invariably by the time you flatten out the bandwidth to be usable for music listening you will lose all the "ripple" gains you would have got. For example I did a 4th order in a 1980 Town Car ages ago to port up through the rear deck and it sounded nice but was basically just sealed box performance with the only benefit being a good way to get all the sound up front. The subs I used modeled particularly well for that alignment and were very fairly priced at Circuit City at the time. Seen a couple big wall builds up here local that sounded good but weren't very impressive on the meter for their power and cone area (one of those guys switched to just a flat wall and is now doing strong numbers) and saw a couple 6th order attempts that were complete failures and were quickly scrapped. Again, most important is run your specs through some modeling software and see if you can get anything that looks useful and do make certain you have some kind of plan on how you can easily modify volumes and port area/tuning all around if it doesn't work out the gate or even after several revisions. [/QUOTE]

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