Another somewhat random pump noise experiment compares direct metal vs. neoprene vs. egg-crate...
Zoom to the end if you just want the top speed comparison portion.
http://www.youtube.com/watch?v=nx7-n3FBeDI
A-weighted frequency response differences:
And for those who would like to provide cooling and decoupling benefits to the DDC series, here is one idea:
http://martinsliquidlab.org/2011/03/...-cooling-lift/
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