I have just bought this new Luxman 507ux II amplifier to replace my Yamaha A-S2000
I use as a source the same Hegel HD11 DAC, on XLR balanced output, to Luxman's XLR balanced input BAL-1
I quickly realized that, while this was perfect with the Yamaha, it did not sound correct on the Luxman.
A feeling of a too large scene, abusively extended stereo, aunclear voices .. Hard to define but not satisfactory. Even my wife told me that the sound was not normal and not clean. Considering the price of this unit I was a bit pissed off.
I realized first that the phase of XLR was not the same on Hegel vs Luxman, hopefully the Luxman amp has a swith to invert cold and hot on the back, I thus moved this switch to "B" (vs "A" by default)
Not real improvement of the sound. Do not ear any difference.
By the way when I move this phase switch while playing I do not hear any sound glitch or cut .. Must be a digital thing .. I have no schematics.
Then I tried the non-balanced RCA link from the Hegel DAC to the Lux 507, and it immediatly sounds far better, "normal" I would say.
My analysis is that the Yamaha was a full balanced design, so the "best" input was XLR, while Luxman is not a full balanced design, so XLR signal must first go through an unbalancing stage, the non balanced input should be naturaly better.
But really, the difference is so obvious, I can not believe it.
I checked specs and I do not see explanation
I still have to test BAL-2 input to see if it is similarly bad as BAL-1
Does one of you use XLR input of Luxman amp ? From what source ?
Did you experience such issue ?
Thks fo reading and sorry for my incorrect english, not so bad for a french guy.