In my systems, the Modwright Sony 999ES sounded brightish with some amplifiers--PrimaLuna One, Electrocompaniet ECI 3, Aragon 8008ST/Rotel RC 995--but mostly warm and sweet with others--Cary SLI-80 and Edge NL-10/Modwright SWL 9.0. On operatic voices and some choral, it could be glassy at volume and high frequencies, though it was wonderful in combo with the Edge/Modwright separates. Finally, it could lack dynamic drive with some orchestral music like Beethoven's "Eroica" symphony (Dohnanyi/Cleveland), while being very good with others (Brahms #1, von Karajan/Berlin, 60s). A good PC helps it a lot (Shunyata, Audience). It is glorious on SACD. I found it sounded best with a big, smooth power amp like the Edge NL-10 in combo with almost any kind of preamp of some quality.