WinISD accuracy

[JonJT 10+ year member]

I've been similuating a number of sub drivers in WinISD lately in an attempt to see which sub would be right for me. I want to design a box that will let me push the sub I choose to its mechanical limits with 1100 watts or less and I'm finding that to be very difficult.

I've simulated 12, 15 and 18 inch RL-p woofers in both closed and vented alignments of differing volumes and tuning frequencies and WinISD repeatidly tells me that I will be no where near the physical limits of the woofer at the maximum recomended 1000 watts.

Whats the deal here? I can't imagine that a manufacture would design and sell a woofer whose voice coils couldn't support the power required to push its suspension to its limits in a reasonably sized box.

I'm firing up unibox to see if I get similar results with the same woofers. I smell something fishy here.

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[JonJT 10+ year member]

Open office doesn't seem to run unibox correctly so thats no longer any option......

 

[Immacomputer 10+ year member]

No, it's not accurate when it comes to actual cone excursion. I've heard people say to add an extra 17% to what it says for a closer estimation but even then, it's not going to be very accurate.

 

[Volenti 10+ year member]

Whats the deal here? I can't imagine that a manufacture would design and sell a woofer whose voice coils couldn't support the power required to push its suspension to its limits in a reasonably sized box.

While it's true that WinISD isn't perfectly accurate here it's also true that many subs are designed to be suspension limited, it's the one part that can and does wear out and break down with use/abuse, making it stronger than it needs to be leads to less warranty claims and more $profit$.

 

[JonJT 10+ year member]

While it's true that WinISD isn't perfectly accurate here it's also true that many subs are designed to be suspension limited, it's the one part that can and does wear out and break down with use/abuse, making it stronger than it needs to be leads to less warranty claims and more $profit$.

Yeah, I know they are suspension limited, WinISD just doesn't reflect that. I think I'll just design a box around the size the manufacture recomends and stay within the recomended power range. Can't go wrong that way.