Satwilson, I was talking about upgrading from the standard 1A "wall-wart" (I kinda hate that term) to the 3A Mouser power supply that you suggested. I went looking for that and alternatives, and also found a 4A unit on Amazon, including this one, which looks pretty reasonable--delivers even more current, and is cheaper than the Mouser. Having got about three quarters of the way through this thread so far, I noted that there was some discussion earlier, somewhere around page 45 to 50, of using beefier power supplies to improve the E/90's sound, and someone mentioned using a variable bench supply, which looked like overkill to me, although potentially effective overkill.
The thing about power supplies, and here I'm speaking as someone who hasn't done circuit design or analysis in 30 years, never got very deep into it and was never all that knowledgeable about it or good at it, but did know something, is that it's never good to starve an amp of power, and you can almost always benefit by providing a little more juice to run on. I'd be curious to hear Kevin Gilmore's view directly, but I'll bet his electrostatic headphone amps don't use a 9v 1A supply, and that it would be a good thing if the E/90 could pull however much current the music tells it that it needs. Now, if Kevin says the E/90 absolutely never needs more that 0.25A, and 1A is plenty of cushion, then I'd say the stock supply is almost certainly adequate.
The other thing is that if I'm right, then the area that should benefit most would be the area that many people complain about with the 950s, the so called bass slam, or what I would describe as running out of steam, which is often as much an amp issue as a speaker issue when it happens with full size systems. Maybe that's what's happening here. (That said, to be honest, I find the 950 to be amazingly natural sounding, with slam being a high point, and very realistic, although I admittedly haven't heard the top dynamics or recent orthos.)
I think I'll spend the $15 on that 4A supply and report back, and do my very best not to be fooled by my desire both not to have spent the $15 in vain, and to be correct.
Edited by Kokomo O - 11/24/13 at 8:28am