Pure Class A SS vs Tube Amp

The J2 does in fact provide XLR as well as RCA inputs, according to its manual and the description at the First Watt site.  I'm thinking that you might have been misled by photos at the Reno HiFi site which are shown under links referring to the J2, but which actually depict the F6.

The Pass XA amps other than the XA25 provide balanced as well as unbalanced inputs, but while the XA25 has a gain of 20 db, all of the other XA amps have gains of 26 db, which as has been said is most likely too high.

Good luck.  Regards,
-- Al

@atmasphere 
thanks for great detail response any tube amp recommendation ?

@almarg 
thanks you’re right I google it and has XLR connection 

check out Decware.com - all tube gear, made in IL - excellent amps. I have their entry-level amp paired with a 99db 8" open baffle. Have not heard it with your Klipsch, but the owner, Steve Deckert, can probably help you. He is very open, honest and helpful. I have been dealing with them for 20+ years now. Excellent gear and company.

Having just recently purchased the Pass xa25 I can attest to the sound.  Tight bass, amazing resolution and clarity.  A 'you are there' quality to the sound.