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<blockquote data-quote="Jeffdachef" data-source="post: 8582268" data-attributes="member: 650438">yeah with his calc you always end up with WAAAAY too much port area. Extremely flawed to the max. Along with not taking any account for the sub&#039;s parameters. Honestly IDK why this garbage calc even exists.&nbsp;&nbsp; a simple pair of 12s on 5k(not clamped) tuned to 35hz needs 20 port per cube minimum and 27 port per cube optimally? lmaooFrom my personal experience and many of my buddies that have been rebuilding boxes left and right.&nbsp; with too much port area they needed a lot more power just to get as loud as the guy with the proper amount of port area for the power they were running which was usually much less.&nbsp; A lot gained from shrinking port area.&nbsp; Hence why you need to factor in clamped numbers with winisd and not what the sticker on the amp says.Thats why some guys running prefabs with a pair of 12 inch sony xplodes and a cheapo amp can break 140 db&nbsp; its actually the right amount of port area and tuning according their power.&nbsp; The setup matching the cabin gain helps as well.</blockquote>

[QUOTE="Jeffdachef, post: 8582268, member: 650438"] yeah with his calc you always end up with WAAAAY too much port area. Extremely flawed to the max. Along with not taking any account for the sub's parameters. Honestly IDK why this garbage calc even exists. a simple pair of 12s on 5k(not clamped) tuned to 35hz needs 20 port per cube minimum and 27 port per cube optimally? lmaoo From my personal experience and many of my buddies that have been rebuilding boxes left and right. with too much port area they needed a lot more power just to get as loud as the guy with the proper amount of port area for the power they were running which was usually much less. A lot gained from shrinking port area. Hence why you need to factor in clamped numbers with winisd and not what the sticker on the amp says. Thats why some guys running prefabs with a pair of 12 inch sony xplodes and a cheapo amp can break 140 db its actually the right amount of port area and tuning according their power. The setup matching the cabin gain helps as well. [/QUOTE]

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