gx10 is heavier, quicker, stronger, and slightly more detailed
gx90 while sounding very similar to the gx10 is a bit "creamier" of a sound.
gx90 is still no slouch in terms of power, its got some real punch to it when you turn it up but the gx10 is something else. the gx90 is rated at 120 rms per channel into 8 ohms with the gx10 being rated at 150 rms per channel into 8 ohms. from 120 to 150 watts technically wouldnt have much if any an audible difference, might just hurt a little more than before.. but the 10 can still just do more and i cant explain it.
The GX9ES ( not the 90) may lack the copper chassis and extra 30wpc as the GX10es, but sonically I've never heard any major differences when I owned the two units. - folks pay the premium for GX10es when the 9ES performs at the same level. must be the copper chassis or the pride in owning the top of the line from the series of it's time. Can't go wrong either way I suppose.
.. the only difference between it and the gx90 i could find was the color of the transformer, heat sink, and the chassis wasnt copper plated. it used the same output transistors, and the same size power supply. the transformer appeared to be of the same size and i didnt notice any difference in weight nor did i notice any difference in hardware used.
the gx80 is rated at 110wpc and the gx90 is rated at 120 wpc. im glad the gx80 didnt work though, i got my money back and a couple weeks later got the gx90 for an even better deal and not only does the 90 work, it came with the rosewood side panels. not to mention it looks better and is the prideful TOTL lol
This is my general opinion on any "cloud" sharing: . What you do not have in your hands becomes hostage, sooner or latter.Shame Photobucket is holding these picture hostage. They were beautiful and a great comparison.