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What is your cut off frequency for alpha 15. I found bracing across the back of the magnet to brace the frame gave a cleaner sound up to 350hz, without, it didn't sound so good and only useable to 200hz.
Frequencies of the section of filters 400gts and 6000gts
you may be ok with 400hz, but as I said you will need to brace the magnet to get good sound quality from the alpha 15 at that frequency.
To fix a loudspeaker magnet?
I think it stiffens the frame and so improves the sound quality. It was someone on here that suggested it some time ago. I don't know the science behind it but it works.
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