VisatonLTS50coating a fullrange driver - diyAudio
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Old 11th April 2013, 10:27 AM   #1
DrBoar is offline DrBoar  Sweden
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Default VisatonLTS50coating a fullrange driver

Visaton LTS50 is a coating compound for loudspeaker cones (paper). To test if iit does anything I coated some vintage oval fullrange drivers 6" by 4"

Frequency response (Omnimic at 10 cm on axis) with one of the drivers set -5dB for clarity
Uncoated, one coat of front, one coat of front and one of the back side of the membrane. Not much going on.
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I then looked at the time domain
Uncoated
Front one coat
Front one coat and back one coat

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Note past 6 cycles in two ranges

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Past 6 cycles in one range after front coating

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Not past 6 cycles with both front and back coating

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Up to 10 cycles in two ranges uncoated

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That thing at 5-6 kHz dropped from 11 cycles to 8 after front coating

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A further reduction

It does look like an improvement

Last edited by DrBoar; 11th April 2013 at 10:36 AM. Reason: added legends
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Old 11th April 2013, 10:43 AM   #2
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nice to see that doping works!
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Old 11th April 2013, 11:26 AM   #3
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Adding something to a cone will always change something. Whether it's actually beneficial or not is another matter entirely and will vary from driver to driver. In some cases, you may obtain a change for the better. In others, you could royally screw it up.
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Old 11th April 2013, 04:34 PM   #4
DrBoar is offline DrBoar  Sweden
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I would not dream of adding that compound to say Voxative drivers on a whim and expect an improvement
Nor my mint vintage Goodman Axiettes.

But more mundane drivers that have more or less of problem with resonances such as Philips 9710, Lowther or WR123, the worst would be that I have destroyed some decent drivers bought in a flea market

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