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And granite / vacuum larger still. I was trying to think of an example that was illustrative so it could be visualised.

Yes certainly Martin. However I suspect this reduction is primarily due to absorption and less so a result of reflection.

I'd be cautious of this Ã¢â'¬â€œ I think we've established the significant mismatches occur between solid/gas , solid/liquid , gas/liquid etc rather than solid/solid. Which you acknowledge in your following point:

The air platform is a good choice Martin Ã¢â'¬â€œ I think air suspension has much to offer. However the interface is still solid/solid (unless of course the platform is literally air in which case I'd be very interested!). The principle at work here is to lower the resonant frequency of the structure, ideally to just a few Hz, rather than shift it higher by adding mass.

I believe Symposium Acoustics are quite keen on the acoustic mismatch idea. Although I don't give much credence to the efficacy of this, their products do look well thought out if you want to have a look.

http://www.symposiumusa.com/main.shtml

<blockquote data-quote="mosfet" data-source="post: 610737" data-attributes="member: 2060">And granite / vacuum larger still. I was trying to think of an example that was illustrative so it could be visualised.Yes certainly Martin. However I suspect this reduction is primarily due to absorption and less so a result of reflection.I'd be cautious of this Ã¢â'¬â€œ I think we've established the significant mismatches occur between solid/gas , solid/liquid , gas/liquid etc rather than solid/solid. Which you acknowledge in your following point:The air platform is a good choice Martin Ã¢â'¬â€œ I think air suspension has much to offer. However the interface is still solid/solid (unless of course the platform is literally air in which case I'd be very interested!). The principle at work here is to lower the resonant frequency of the structure, ideally to just a few Hz, rather than shift it higher by adding mass.I believe Symposium Acoustics are quite keen on the acoustic mismatch idea. Although I don't give much credence to the efficacy of this, their products do look well thought out if you want to have a look.<a href="http://www.symposiumusa.com/main.shtml" target="_blank">http://www.symposiumusa.com/main.shtml</a></blockquote>

[QUOTE="mosfet, post: 610737, member: 2060"] And granite / vacuum larger still. I was trying to think of an example that was illustrative so it could be visualised. Yes certainly Martin. However I suspect this reduction is primarily due to absorption and less so a result of reflection. I'd be cautious of this Ã¢â‚¬â€œ I think we've established the [I]significant[/I] mismatches occur between solid/gas , solid/liquid , gas/liquid etc rather than solid/solid. Which you acknowledge in your following point: The air platform is a good choice Martin Ã¢â‚¬â€œ I think air suspension has much to offer. However the interface is still solid/solid (unless of course the platform is [I]literally[/I] air in which case I'd be very interested!). The principle at work here is to lower the resonant frequency of the structure, ideally to just a few Hz, rather than shift it higher by adding mass. I believe Symposium Acoustics are quite keen on the acoustic mismatch idea. Although I don't give much credence to the efficacy of this, their products do look well thought out if you want to have a look. [URL]http://www.symposiumusa.com/main.shtml[/URL] [/QUOTE]

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