Luxman L-505A Limited has a smooth, supple and gentle sound. The silver amplifier on the right is Luxman. By the way, the black amplifier on the left is Sansui.
Thank you for watching! Sorry, I have never heard of L-505UX2 or L-590A. I have heard of L-505UX. The L505UX has a lively sound, but the sound is slightly rough.