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Original Message

1.7 frame damping

Posted by zulugone on December 23, 2016 at 11:13:29:

A question for those who have experimented with frame damping schemes....post warranty.

I have read posts about replacing MDF frames with wood and various schemes for stands and damping mostly with skepticism. My skepticism comes from not seeing much in the way of before and after measurements. I can feel the frames vibrate with bass but I can't see the frames move back and forth though it seems reasonable that they might move in the range of thousandths of an inch. I have never seen the Mylar move. My ears are measured golden by a board certified audiologist however the CPU to which they are attached not so much. I can only guess that stands work given their popularity.

I came across a post somewhere by josh358 stating that Jim Winey said metal frames would be ideal but would weigh too much to ship. That got me contemplating more steel.

On either side of the Mylar in front there is a 1/2" x 2" space and in the rear a 1/2" x 3 1/2" space. Both run most of the height of the 1.7. Any thoughts on the damping effect of filling both spaces with steel flat bar with or without a layer of damping material between the steel and the MDF? The flat bar could be drilled, countersunk and through bolted all hidden under the sock. This would add over 70 lbs. to each speaker. I could also have the top bolt stick through the sock to be bolted to a brace angled to the feet though I wonder if the Mylar vibrations would be able to move all that steel.