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#1 |
diyAudio Member
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Where can I buy one of those? I can find a lot of information, but all old. And I don't have time go get into some DIY construction project about it.
I plan to make some cabinets, and want to experiment with damping, bracing, coating. Therefore it would be really handy to have an accelerometer of some kind (I'd hope connectable to Mac or iPhone) to quantify improvements or lack thereof |
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#2 |
diyAudio Member
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I've used half a glass of water or coffee. ... wouldn't connect that to a Mac or iPhone though.
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#3 |
diyAudio Member
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The absolute cheapest way would be "Guitar Pickup Piezo Contact Microphone" off ebay, for < $15, shipped.
It wont have the infrasonic response a real accel might have and you wont be able to calibrate it to compare measurements with someone else. But it should give you relative indications of the effectiveness of your damping applications, i.e. brace / no brace, coating / no coating, etc.
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Joe Jasniewski - PC>ZOUDIO AIO4CH> OB Lii Audio F15s w/ 18" assists. |
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#4 |
diyAudio Member
Join Date: Dec 2009
Location: Halifax, Nova Scotia or Montreal, Quebec, Canada
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Siegfried Linkwitz used a phono cartridge for the purpose in some of his early experiments.
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"In the world of commerce and finance it is thought quite remarkable if a man is both clever and honest." -- Demosthenes |
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#5 |
diyAudio Member
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#6 | |
diyAudio Member
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Quote:
My idea is have a professional build the cabinet shells, and then I experiment with all the internals. Like how about a rigid brace, versus a brace under compression but with a gel pad at one end. Well, something more durable than gel but with some vibrational elasticity which I someone opined was more effective than total rigidity. |
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#7 |
diyAudio Member
Join Date: Dec 2009
Location: Eburg
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Can a smartphone be used as an accelerometer?
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#8 |
diyAudio Member
Join Date: Dec 2011
Location: Arnhem, NL
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The accelerometer method is either tedious or quite inaccurate. Tedious: you will have to measure every other square inch (way of speech) of the panel involved and next calculate the integral to get a reliable impression of the actual sound production of the panel. Inaccurate: if you only measure on a few spots, you will not have a clue about the mechanical-acoustical transmission of the vibrating panel.
Furthermore, don't worry too much about panel vibrations, as a decent cabinet will do fine in domestic situations. With possibly one exception for the vibrations of loudspeaker units to the baffle. |
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#9 |
diyAudio Member
Join Date: May 2016
Location: Bideford, North Devon
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I bought an accelerometer for exactly this purpose, then realised it would tell me nothing about the Q of the resonances nor the real-time energy storage of the enclosure, both of which I consider rather important. I would tend towards a low mass, highly damped enclosure rather than an ultra-stiff (within reason - ie. not a hollowed-out 2 ton boulder) and possibly high Q option.
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My glass is never half empty, just 3dB down... |
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#10 |
diyAudio Member
Join Date: May 2016
Location: Bideford, North Devon
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Sorry to stray off-topic a little, but I have been think along these lines; using a two-piece brace supporting opposite walls with a visco-elastic material joining them and operating in shear.
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My glass is never half empty, just 3dB down... |
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