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Old 02-11-2020, 04:06 PM
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Default YT video by PC: "The Impact of Material Composition on Resonance Properties"

I made a little video examining the impact of different materials and their resonant properties using a simple music box mechanism. Got this idea from Norm Varney of AV Roomservice, LTD. Norm is one of the best acousitical engineers in the business and built one of Robert Harley's dedicated listening rooms.

Anyhoo, here is the link to my little video:

https://youtu.be/-b1Vzxl7-to

Welcome thoughts and input from the gang.
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  #2  
Old 02-13-2020, 10:14 PM
John Jordan John Jordan is offline
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Stephen-

Thanks for taking the time to do this experiment document and post the results.

Considering the price difference, the plumbing supple house specials will remain on my rack.

Having once made a prototype rack from that particle board/formica material, the sound changed dramatically on the finished product using maple butcher block material.
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Old 02-13-2020, 10:29 PM
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Fun stuff Stephen. My mind wonders how you might evolve this to span a wider frequency range & sound level. Obviously you need a different source.

How about a small speaker fed a series of test tones at various volumes. You could develop a designed experiment... the right shaped speaker would allow you to test lots of materials. Very curious to see how you could test Stillpoints that way.
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Old 02-19-2020, 11:07 AM
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Quote:
Originally Posted by Puma Cat View Post
I made a little video examining the impact of different materials and their resonant properties using a simple music box mechanism. Got this idea from Norm Varney of AV Roomservice, LTD. Norm is one of the best acousitical engineers in the business and built one of Robert Harley's dedicated listening rooms.

Anyhoo, here is the link to my little video:

https://youtu.be/-b1Vzxl7-to

Welcome thoughts and input from the gang.
Nice Stephen...what app are you using to measure?
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  #5  
Old 02-19-2020, 12:50 PM
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Like what you did Stephen
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Old 02-19-2020, 01:46 PM
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Quote:
Originally Posted by crwilli View Post
Fun stuff Stephen. My mind wonders how you might evolve this to span a wider frequency range & sound level. Obviously you need a different source.

How about a small speaker fed a series of test tones at various volumes. You could develop a designed experiment... the right shaped speaker would allow you to test lots of materials. Very curious to see how you could test Stillpoints that way.
Thanks, Craig.

I think the compelling thing about using the music box mechanism is that it won't make much if any noise if the material underneath effectively damps resonances.

I know, for a example, that a cone would make a lot of "music".
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Old 02-19-2020, 01:47 PM
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Quote:
Originally Posted by Audiophilehi View Post
Nice Stephen...what app are you using to measure?
Hi Paul,
Not sure what you're referring to with respect to the app; I just made a little video with my Fuji X-H1 of the music box mechanism. Will be making another using EVPs.
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Old 02-19-2020, 01:48 PM
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Quote:
Originally Posted by For The Love of Music View Post
Like what you did Stephen
Thanks, Ed. I got the idea from Norm Varney at A/V Roomservice.
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Old 02-19-2020, 07:02 PM
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Quote:
Originally Posted by Puma Cat View Post
Hi Paul,
Not sure what you're referring to with respect to the app; I just made a little video with my Fuji X-H1 of the music box mechanism. Will be making another using EVPs.
Hi Stephen...the app on your iPhone that’s taking the measurements.
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  #10  
Old 02-19-2020, 07:05 PM
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Quote:
Originally Posted by Audiophilehi View Post
Hi Stephen...the app on your iPhone that’s taking the measurements.
Ah, okay. If you're referring to the vibration measurements in about in another post, I'm using the VibSensor app.

I also like the Hamm Seismograph app for a real-time display of vibration when music is playing.
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