Difference between Luxman L-550A II & L-507u

i had a chance to do an A/B comparison between 590AII and 507u, the setup was with a luxman d06 cdp, proac D18 floor standing speaker..the result is quite similar to what Dkasab described above, 590A II was lusher, warmer, slower and thicker sounding than 507u. 507u had better image, faster sounding, a lot better in dynamics and attacks and better detail(i could hear clearly the sound from the backstage)..my speaker is b&w 805s so if i were to get one, i would pick 507u..which was a complete different story when i tried Accuphase e-450/e-550...i'd prefer e-550 a lot more...

507u is quite a big jump from 505u in terms of driving capability, clarity, depth of the stage and the overall smoothness. my local dealer here have all 505u,507u,509u, and 590A II in demo. i was lucky to have a chance to do a/b/c/d/e comparison with all of them along with a gryphon diablo. before i went there i was targeted at 507u simply because i thought it has newer circuit board, only 10w difference with 509u and it's 2.5k cheaper. the speaker was a pair of triangle megallen bookshelf, cdp was a luxman d-08. i first listened to 507u and overall i was quite satified though i found it was a little too ss sounding for me. switched to 590A II, 590AII had a lot more body and weight in the sound nodes, its definitely a thick sounding and musical amp. the 507u did better on high/low extension but could not match the well defined sound nodes and smooth presentation of the 590AII.

and then i switched to 509u, i was confident to say 509u was in complete different class with 507u and 590AII. it had the smoothness and body just like 590AII with just a tad thinner sounding. soundstage was so open with a lot more depth, what i liked the most was the authorities and powerful control of the entire frequency spectrum that you could not find in 507u and 590AII. 509u was able to portrait a complete stage while listening to orchestra. high/low extension was extremely well and stable.

i finally bought 509u even though that was out of my budget but at the same time it did so well that was beyond my expectation and now i couldn't be happier. i compared it with gryphon diable and i would say they were in the same class. gryphon had more powerful bass and sedutive vocal, however, it lacked depth, sound seperation was even worse than 507u and highs/details was not so great at all