Hi all you brain twisted DIY'ers, I'm just sitting here with my brain twisted and frying, and figured I'd try and pass alittle of it off!
I've been looking at group delay and phase shift.
Would it be safe to assume two of the reasons sealed subs have a cleaner sound are, group delay and phase characteristics?
Two of the sub designs I've modeled using the WinISD program that Thomas sent me show a large delay centered around the vented units port tuning, it's about a 30ms difference, which I would think creates a blurring effect.?
Also group delay at 20hz is 132 deg for sealed and 175 deg for the vented design, is the 43 deg difference noticable? and if so, how does this extra shifting of phase manifest itself?
Now the main question, does anyone know of an EQ'ing system that can take the natural roll off of a seal cabinet, and EQ it so it's flat to 20hz?
The sealed unit I've modeled has an F3 @ 35.4hz and drops to -10.5db @ 20hz.
I realize that for the amp to provide that much gain at 20hz, it will need to be about 8 times larger than what I would "normally" use, maybe more, so my thought is a used pro amp.
Any ideas on the EQ system???
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Would it be safe to assume two of the reasons sealed subs have a cleaner sound are, group delay and phase characteristics?
Two of the sub designs I've modeled using the WinISD program that Thomas sent me show a large delay centered around the vented units port tuning, it's about a 30ms difference, which I would think creates a blurring effect.?
Also group delay at 20hz is 132 deg for sealed and 175 deg for the vented design, is the 43 deg difference noticable? and if so, how does this extra shifting of phase manifest itself?
Now the main question, does anyone know of an EQ'ing system that can take the natural roll off of a seal cabinet, and EQ it so it's flat to 20hz?
The sealed unit I've modeled has an F3 @ 35.4hz and drops to -10.5db @ 20hz.
I realize that for the amp to provide that much gain at 20hz, it will need to be about 8 times larger than what I would "normally" use, maybe more, so my thought is a used pro amp.
Any ideas on the EQ system???
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