I suppose it's possible that the heavier wood is actually dampening resonances in the headphone structure itself. But low freq wavelengths are so long that I doubt if one wood attenuates the waves any better than another.
I've never seen an LA modded Denon in person, let alone two at the same time, so it's unlikely I'll ever get the chance to compare different wood cups side-by-side like you have.
Now, balanced cables I have compared side-by-side. There is no difference to my ears and no science that I know of to explain why a balanced connection would sound different, let alone better.
Your experience is different though, and I respect that.
For me, the largest difference in sound from one pair of Denons to another remains the fit of the earpad against my head and the tightness of the seal. This alone is the only thing that dramatically changes the sound to my ears (so far).
I am excited to get my D7000's back from Mark and of course I'll post my impressions of the changes/improvements that I hear.Edited by palmfish - 9/1/12 at 4:33pm