Best speakers with Pass labs X-350.5

Add JBL K2 S9800 to your list

Pass (350 or XA160) + K2 is one of the most highly regarded combo in both Asia and Europe

the K2s are kind of hard to find here in the states, but you can get it through their special dealer network
good luck

Merlins,along with the others mentioned above,good luck,Bob

My system are wadia 861, Pre amp Aesthetix Callisto Sig., a pair of Pass XA-160 and the Alto Utopia BE. It sounded wonderful so check out the Alto. Good luck

try wilson audio sophia 2

I think you'd enjoy the Wilson WP7 in your system.
With the ARC Ref2 and X350.5 I would not worry about hot treble with the Wilsons.
Dynaudio should be a good match as well.
I don't know what you meant by whisper treble on the 802Ds though. I think the X350.5 may be just about the starting point as far as power is concerned fot the 802D so if you don't listen to heavy metal at ear bleading levels, then it may do.