Relation between strecher and heatshrink in ESL building - Page 2

I_Forgot · 12th April 2008, 01:12 AM

My experience has been that if you want an ESL to be efficient which translates to playing loudly, you need to use high bias voltage. That means you need a LOT of tension on the diaphragm. That means you can't use heat shrinking.

I_F

stokessd · 15th April 2008, 08:25 PM

High efficiency is good, but so are low resonant frequencies. You can play games with spacer and support geometry to get both low resonant frequency and good support for stability. But for a given geometry cranking up the tension can lead to other problems. If you are buildig a narrowish ESL and crank up the tension, you may have to deal with a resonant peak above where your woofer cuts over. You can use that to your advantage (as some older ML ELS's did I think) by using the resonant peak to counteract the frequency rolloff due to pressure feedback, that it's not a great solution.

But in general I_F is right, tension is good. In my experience either technique will lead to sufficient tension to be a satisfactory ESL. The technique that is best for you is the one that you are most consistent with.

Sheldon

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12th April 2008, 01:12 AM	#11
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	My experience has been that if you want an ESL to be efficient which translates to playing loudly, you need to use high bias voltage. That means you need a LOT of tension on the diaphragm. That means you can't use heat shrinking. I_F

15th April 2008, 08:25 PM	#12
stokessd diyAudio Member Join Date: Nov 2002 Location: Fort Wayne, IN	High efficiency is good, but so are low resonant frequencies. You can play games with spacer and support geometry to get both low resonant frequency and good support for stability. But for a given geometry cranking up the tension can lead to other problems. If you are buildig a narrowish ESL and crank up the tension, you may have to deal with a resonant peak above where your woofer cuts over. You can use that to your advantage (as some older ML ELS's did I think) by using the resonant peak to counteract the frequency rolloff due to pressure feedback, that it's not a great solution. But in general I_F is right, tension is good. In my experience either technique will lead to sufficient tension to be a satisfactory ESL. The technique that is best for you is the one that you are most consistent with. Sheldon

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