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In Reply to: RE: IsoDamp C-1002 Adhesive to fix between MDF shelves? posted by tweaker456 on February 15, 2021 at 18:10:41
Tweaker465:
I put in 33 years in the EAR technical department doing R&D
in acoustics and vibration. Both spray on and painted on
adhesive layers will work with C1002 ( i have done it myself
with excellent results ). The advice you got from EAR may or
may not have come from an experienced technical/ engineering
person. However, it may be easier to use roll type PSA as an
adhesive if it can be acquired. The PSA has no real technical
advantage over using a very good contact adhesive as far as the
constrained layer performance (assuming that an even, thin coat
of contact adhesive is applied). As far as lining up the materials
to be bonded, using some sort of jig/registration system takes all
the guess work out of putting layers together.
Follow Ups:
Thanks for all the research and advice, it appears the UK or more the EU is somewhat restrictive in what solvents/adhesives are available in the UK.
Make It Funky Now!
I'm all for even and as thin as possible. Ever compared the fabulous EAR C-1002 to bamboo?
I love the smell of Schadenfreude in the morning- Robert Seckler
Tweaker456:
We never did any studies on the self damping qualities of Bamboo
during my time in R&D at EAR. It is true that some woods (and MDF)
have lower degrees of resonant behavior. The most important thing
to be aware of is the fact that "damping" reduces resonant behavior
either through extension and compression (extensional damping), or
through shearing (constrained damping). A shelf can be "damped" to
reduce resonant behavior, but damping cannot eliminate shelf vibration
that occurs as a result of being "driven". An audio sound field of
any significance will tend to want to vibrate a component shelf (micro
vibrations). This input energy will both drive the shelf, and excite
it's resonances. damping will usually only address the resonant behavior.
One very simple way to reduce "driven" behavior is to have HIGH mass, which will present a high "impedance" mechanically to the sound field energy. Imagine a thick solid granite component shelf system - it's mass will be so high that sound field energy will have no effect on it, because
of it's high mass. There are lighter (but expensive) ways to eliminate vibrations by using electronic servo controlled platforms that reduce
vibration energy (as used in the optics industry).
One very simple way to reduce 'driven' behavior is to have HIGH massAn interesting thread - thanks.
To confirm the point you make, a few weeks ago I tried on a whim placing antique smoothing irons (which I had to hand but see link for style) both directly on top of components and on the granite shelves they sit on. For 'clocked' components such as USB gizmos, LAN switches or a plastic-cased DAC, the SQ improvement was dramatic though I couldn't hear a difference with power supplies.
By now curious, I next tried some modern cast-iron kitchen-scale weights but they were much less effective. I have no idea why.
I did get a further improvement by replacing a clocked component's rubber feet with lengths of copper bar (typically 1" or 2" wide, 1/4" thick, length as appropriate) which I bought on ebay.
Dave
Edits: 03/12/21
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