Levinson, Pass labs or Parasound?

if you're considering Pass Labs amplifier, then you're probably better off if you get the latest .5 amps.
X350.5 or even X250.5. Although I never compared how the older series amps sound vs the newer x.5 series, word is the newer ones are more natural sounding. I own X250.5 and it is a great amplifier. Drives my B&Ws no problems.
In the under $4k range, used, also consider McCormack DNA-500.

Hi Brimac. Jason at NuForce does not recommend plugging their amps into power conditioners. I'm delighted to hear that the PS Audio 300 power plant is compatible with them. What else is plugged into the PS Audio PP?

Hi Yoby,
I was talking to Jason last week, and he recommended the Black Noise Mains Filters from Italy. I've asked him to send one so I'll report on that experience when it's in system. Perhaps it's my electricity, but the Power Plant really raised the already excellent performance of the Nuforce amps to an even higher performance level. The soundstage just exploded in width and depth, and imaging became pinpoint. Impressive!
I also have an Audio Aero Cap mk 11 CDP plugged into the Power Plant.

If you choose to consider Class D amps, do visit the Cullen Circuits website and peruse his "Wyred for Sound" monoblocks. I recently bought a pair of the "Ice Cube SX-1000"s and am very impressed. 1000W/channel into 4 ohms, well-built and quite attractive in an understated way. They are dead quiet in balanced mode and sound terrific. At $1199 each they are a huge bargain relative to other high end amplification.

i have had the jc1 , ml335 , pass x350 , krell 300cx but now i keeping the ml23.5 . Thanks