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RE: 1.7 frame damping

Posted by zulugone (A) on December 24, 2016 at 09:49:48

In Reply to: RE: 1.7 frame damping posted by andyr on December 23, 2016 at 23:01:43:

Yep, I am intentionally combining everything to do with vibration. My theory is that a little damping in some place will have the most effect and thereafter adding more will proportionally do less good....though there is concrete :).

I had the sock off of a 1.7 and noticed that the frame thins between the outside edge and the Mylar leaving lots of room for damping material. I can guess that making the frame thicker in front close to the tweeters might case a sonic problem. I don't know if a lot of steel nearer the magnets could cause any problem or if Magnepan made the frame thinner in places for sonic reasons or just to keep shipping costs down.

For damping material I have been looking at butyl tape (cheap) and Sorbothane products (not cheap) rather than the automotive stuff. Steel wins on density and price.

I found lots of interesting acoustics reading on damping outside of the HiFi world. One idea was to only dampen 25% of a vibrating surface (like the magnet frame?) as more damping didn't improve more.

I did find one post here that mentioned using an accelerometer....some of which cost more than the speakers. I found a cheap one used for speaker box design I will look into. The idea is to produce a graph similar to the REW waterfall for box vibrations by frequency. I braced a 1.7 to the wall behind (very rigid) for a quick test and could detect no change with REW but that test didn't deal with more significant bass.

My first tupid thought on speaker sway was a clear fishing line secured at the end of the front and back feet and the top of the speaker....but first I have to get an accelerometer.

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