That's what I read, no audible improvement...which is why I ordered my M22's and VP150 with the die cast...

I figured if at some point I had to sell them, the die cast might just make it a bit easier.
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M22's v3, 2 x EP500v3, VP150v3, QS4's, Denon 3808CI

My Botswana Safari photos
http://smu.gs/R41Byt