@joshfc2001
I had a listen to the balanced jack of the TAZH1ES and compared to the Balanced jack of the ZX507 with my IER-M9.
I notice that the TAZH1ES has a sound that is very clean and distortion free, like most class A amp I have heard. It's not harsh, no glare in the treble. It's felt flat across the frequency spectrum, even with Dsee HX and DC phase turn on.
The ZX507's sound is quite different, it's more dynamic and more aggressive. It doesn't have the smoothness and refinement of the TAZH1ES but I am hearing more sharpness and transient attack out of it. The bass on the ZX507 is much more emotive to listen to.
I find myself liking the sound of the ZX507 output more as it has more entertaining to listen to. I think the TAZH1ES is certainly a great clean sounding amp, it has one of the most quiet noise floor I have heard.