Hi folks,
Sorry for the slow response. I don't visit my system page often and don't get notices when someone's posted here.
Jwm, I've not heard the MY Sonic Labs Ultra Eminent. Sorry.
Peter, I'm equally curious, but haven't tried one yet.
Needfreestuff,
I haven't heard the ZYX Diamond Gold but I can speculate based on similarly-featured models that I have heard.
1. That big blue ball on the front acts as a vibration storage and reflecting device. Stray mechanical vibrations enter the ball and bounce around inside for varying lengths of time (depends on the frequency and the phase when it first entered the ball). Because the material (lapis lazuli) is dense, highly organized (crystalline) and highly inelastic, it does not damp internal vibrations well, if at all. At some point the vibrations, little diminshed, exit the ball and go right back into the cartridge generator. Result: multiple time- and phase-shifted echoes of the original signal... ie, sonic mud.
On the Omega, this effect was instantly obvious, intensely annoying (to my ears) and resistant to all efforts to tweak it away by fiddling setup parameters. A high level background murmur is inherent in this design, for the reasons explained above.
As the Diamond uses the same ball, there's no reason to expect anything different.
2. If "Gold" indicates coil windings made of gold wire (vs. silver or copper) than it would be my last choice of the three. I've compared copper/silver/gold coil windings on multiple ZYX models. In every case, the gold was the least dynamic, most muffled and most artifically smoothed. This is a simple side-effect of each metal's mass. Gold is heaviest, silver next, copper lightest. The lower the moving mass, the more responsive the cartridge. A plain and simple cause and effect.
Components that smooth or deaden the sound are not my cup of tea. Some people like to "tame" a rough or spiky sounding system by band-aiding on a smoother component somewhere. This is fundamentally wrong and defies the essential concept of audiophilia, which is faithful reproduction. If one has a spiky sounding system, find out the cause of the spikiness and adjust or replace it. Fixing problems at their source is the path to sonic and system improvement. Covering them up is like brushing dirt under the rug... temporarily better but worse than useless in the long run.
My $02!

