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Very good.  Raal 70-20XR...interesting.  Where are you planning to cross these over?

I remember the discussion about the internal balloon.  That is a very good idea and this may be the perfect opportunity to try it.  It will also be interesting opportunity to work on enclosure damping methods.  Being made of steel, they will probably make all kinds of noise without some help.  I have used frequency sweeps and a stethoscope to find the resonant modes in enclosures and strategically damped them out.  It worked out very well.  Today, I thought of something that may be worth trying.  With a steel enclosure, you might try glueing (silicone glue would be perfect) some hockey pucks over the most resonant areas.  It should work, they are easily removed if it doesn't, and best of all, hockey pucks cost 99¢ each.

LBJ

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