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Old 14th March 2010, 02:42 PM   #1
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Default selecting woofer replacement

Hello All

I need a new woofer to replace an old one that isn't made any more (and the damage is beyond repair).

I do not want to make any modifications to the crossover (primarily because I don't know how), so thus want to select the most appropriate new woofer for swap.

I know the obvious things to match: size, 8 ohms, frequency range. But how would you rank order the importance of additional parameters? I have all the parameters for the old woofer such as: Force factor, VAS, QTS, QES, QMS, etc. Which of these values (or any other values) are the most important to match? I can't find a woofer that matches on all measures, but many match on some of the measures, so which are most important to retain?

Please feel free to also just email an answer to

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Old 14th March 2010, 07:27 PM   #2
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QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"
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Old 14th March 2010, 07:34 PM   #3
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Originally Posted by Moondog55 View Post
Agreed, along with sensitivity

Depending on the enclosure type (sealed box would make things easier) you can vary the parameters & still end up with something extremely close. Reflex enclosures would need things more precise
"Never let your morals prevent you from doing what is right!" Salvor Hardin
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Old 14th March 2010, 07:56 PM   #4
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Default more info

Thanks for the replies so far, and as i have now learned this is relevant: it is a closed box. To be specific, its a Seas kit 503, and i need to swap the Seas 13 inch woofer...
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Old 14th March 2010, 08:22 PM   #5
Loren42 is offline Loren42  United States
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Can you have the other woofer measured for its T/S constants?

There are places that will do that, then finding a match will be a little easier.
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Old 15th March 2010, 08:11 AM   #6
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Thanks again for the replies.

Im replacing both woofers, so no need to match the other, just to match the Xover. I have ALL the original specs on the woofer.

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