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<blockquote data-quote="cunokyle" data-source="post: 2957833" data-attributes="member: 562208">Ok, I am using WinISD to help design a purely SPL enclosure for events. The only thing is, that I have entered EQ info for cabin gain(Linkwitz transform) and now all my calculations are returning similar SPL levels for every tuning frequency. Not sure if I did it correctly or if I should just not enter the EQ info to the program to determine tuning frequency.My internal vehicle length from wall to windshield is a little over 7ft(2.2meters) so I used the following info:internal car length = 2.2mLinkwitz transformf0 =80fp =15Q0 =0.707Qp =0.707from <a href="http://linearteam.proboards12.com/index.cgi?board=winisd&amp;amp;action=display&amp;amp;thread=1087022128." target="_blank">http://linearteam.proboards12.com/index.cgi?board=winisd&amp;amp;action=display&amp;amp;thread=1087022128.</a>Now however, my SPL number in WinISD is always pretty much the same +/- a half decibel or so from 30hz to 60hz no matter which tuning frequency I tune to. Is this an accurate result? Will the tuning frequency have pretty much no impact on SPL numbers? That doesn&#039;t seem right to me, but maybe I am missing something.</blockquote>

[QUOTE="cunokyle, post: 2957833, member: 562208"] Ok, I am using WinISD to help design a purely SPL enclosure for events. The only thing is, that I have entered EQ info for cabin gain(Linkwitz transform) and now all my calculations are returning similar SPL levels for every tuning frequency. Not sure if I did it correctly or if I should just not enter the EQ info to the program to determine tuning frequency. My internal vehicle length from wall to windshield is a little over 7ft(2.2meters) so I used the following info: internal car length = 2.2m Linkwitz transform f0 =80 fp =15 Q0 =0.707 Qp =0.707 from [URL="http://linearteam.proboards12.com/index.cgi?board=winisd&action=display&thread=1087022128."]http://linearteam.proboards12.com/index.cgi?board=winisd&action=display&thread=1087022128.[/URL] Now however, my SPL number in WinISD is always pretty much the same +/- a half decibel or so from 30hz to 60hz no matter which tuning frequency I tune to. Is this an accurate result? Will the tuning frequency have pretty much no impact on SPL numbers? That doesn't seem right to me, but maybe I am missing something. [/QUOTE]

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