Luxman tonality


I’ve seen many members describing the Luxman 509x and the m duo as warm thus colored. I’ve had these units and have never thought of them as bright or dark(warm). They are superbly neutral to me neither adding or subtracting. I find them to be very musical. A prospective buyer might pass on Luxman thinking that they won’t match up with many speakers. Of course they will. Neutral is neutral. It’s what we should want.

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Funny you mentioned euphonic sound. I had an argument about that. The expert told me that euphonic sound is nothing but adding audio crud to your system. With tubes you're basically dumbing down your system. I guess my Luxman tubed preamp is a big pile of crud. I was told to get a AVR for true sound and look up Peter Azcel of the Audio Critic. 
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Funny you listened to the expert, when you could have simply looked it up. Go ahead. Don’t take my word for it. I just did a search and came up with this. But seriously, do not take my word for it. Look and see for yourself:

Euphonic: adj. Pertaining to, or exhibiting, euphony; agreeable in sound; pleasing to the ear; euphonious

Agreeable, pleasing. Euphonic simply means what we like. Your "expert" did exactly what I said, took something good and twisted it around into something bad. Your "expert" is full of it. As they usually are.
He’s rather odd. He really doesn’t listen to music. Mostly test tones. Plus he has a group of friends that back him up. I spend most of my money on music. I don’t know about you but personally I think AVR’s and AVR processors suck on music. That’s why I keep them separate.
Completely agree with OP. When I first went to audition the Luxman 590AXII, I was expecting this warm, lush, rolled off sound. Why? Because that's what I had read about them. I was completely wrong!

Compared to 509, the 590AXII tilts towards warm, but only by a smidgen. After living with it for a few months now, I would say the 590AXII is fairly neutral with just a hint of warmth. And as Eric said, the extension on both ends is really amazing. 

Previously, I had the Audio Research GSi75 which is renowned for its wide soundstage. Let me tell you that the Luxman has a soundstage that would rival, if not outdo, the soundstage width of ARC. It controls the woofers of my speakers much better. However, the one area where the ARC had a leg up was palpability and the extra air around instruments that only a good tube amp can give you. But in all other areas, the Luxman takes the cake.