Conrad Johnson premier 16ls II or 17ls II would be a very good match for your levinson amp. I would not suggest changing your amp as it is already top notch and as you state you are happy with it.
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I replaced a KRC3 KRell Preamp with a CJ16LS in front of my Levinson 335.5 driving Wilson 5.1s and it sounded awesome.
I still have the 16LS, but sold the Wilsons and 335.5 and went full tube and horn with Cary V12 and Aventgarde Duos.
Levinson Wilson combo was good, but Cary/Aventgarde combo is really good, at least in my room. Not quite as much slam, but still very dynamic and much smoother.
Anyway - highly recommend the 16LS for your 334.
I found an impedance mismatch with the Pass X0.2 and Levinson amps. BAT VK50SE worked good, but not a match for my current speakers.
Classe and Levinson preamps both have the same output impedance. You can "flavor" your sound with these.
I ended up with the Classe Omega. I bought it used here on the 'Gon. Excellent!