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I had a 505U and I got a pair of Proac D40R's....it seemed quite clear to me these speakers needed a bit more power and quality.
I ended up with an ex-dem Rega Osiris-it did both jobs-more more slam but with quality and detail-this might not be the amp for you but with a decent trade in on your Luxman you will be able to pick up a suitable replacement amp albeit second hand.
Awhile back I researched the integrated amp field looking to simplify but not sacrifice, my system. My speakers are Salk Sound SS8's that are rated at 87db and pretty much a flat 4 ohm load.
After listening to intergateds from Luxman, Accuphase, Musical Fidelity, etc. I decided on and purchased the Jeff Rowland Continuum S2. It is the most dynamic amplifier I have ever heard. It has the layers of sound, extension and finesse of a really good tube amplifier (VAC) while possessing the drive and dynamics of top notch SS gear (PASS Labs).
The JRDG Continuum S2 is also available with a DAC (which I've heard is pretty good sounding) or a phonostage which mine has and it is pretty damn good, though my Herron VTPH-2 smokes it!
Good luck in your search.
I did audition the 550AX about a year before purchasing the 505UX. As stated in my opening post, I only lived with it for about a month or less and the only thing I remember was how much power it had for 20W. I wish I could have spent more time with it. I've owned the 505UX for a year and have put it thru the paces so I know it's tendencies.
Thank you for mentioning the Jeff Rowland. I've never heard one but will look into it.
Well I've had my L550ax for about 2.5 years. I too wanted to simplify, I had a CJ Premier 140 Tube amp and and EAR 868 Tube Pre. Can't say the Luxman is better but I can say I haven't missed the tube stuff. Lux is easier to live with, does a great job with my Sonus Faber Electa Amator II's and the MC pre works well too. Sonus in my main system but my other system is Magnepan 1.7 based and the Lux works fine with them as well. Can't turn the thing past 12 o'clock in either room. For reference my other integrated is a NAD C375Bee. Damn nice as well. I've been an audiophile kinda guy for a long time but (almost) off the gear bandwagon (sort of). Except for the new Chord Qute EX DAC with the Lux. Of course. Well that's another thread. If you're in the NYC are glad to demo over a weekend.
My first audition was the Luxman 550ax and I thought it was terrific. The next step, of course, was to listen to the Luxman 590ax. It was a huge improvement over the 550ax and was more expensive. After listening to both units several times, I decided to replace my Ayre AX-7e integrated amplifier with the Luxman L-590ax class A amplifier. In addition, I wanted a fully balanced integrated amplifier like the 590ax.
I was "surprised and shocked" at how much better the Luxman was over the Ayre. Of course, there is a huge price different but I felt the extra dollars were justified because of the improved sound.
In summary, the music is fuller, with more detail and with better bass control. I am hearing more things than I did with the Ayre AX-7e amplifier. The mid range is outstanding. I do not understand but classical music sounds better on the Luxman than the Ayre. The music is clearer, more airy and easier to listen to. Overall, the new amplifier sounds excellent in my system. I listen to classical, jazz, blues, country and new age.
I recommend you give the Luxman 590ax a listen. It drives my Sonus Faber speakers perfectly and class A sound is excellent.