Pass Labs XA30.5 Fuse Issue/Question

Are you sure there are no strands of wire touching at the speaker terminals?

Certain the fuses are the correct rating? You can read it on the metal end caps.

Can you run it at a low level for a period of time? I don't know the circuit but it's possible that it might bring on more transistors as power output is increases, and something there has failed.  

@noromance 

Good thought about the short on one side of the speaker cables or another. If not, sounds like time to ship to Pass.

Likely.. but do call Pass Labs first!

If you recently purchased the amp, I would call The Music Room and ask for help.

+1 on calling pass labs and the music room. I would start with pass labs to gather some data points for the conversation with TMR.

Question - do you have the amp connected to the wall or to some sort of power conditioner/strip?

You should play the amplifier through another set of speakers before calling the seller or Pass. Tripping a mains fuse at higher playing volumes makes the Harbeths the prime suspect.

" I tested the amp with a different set of speakers and a different source/preamp, but the same issue occurred every time."

You should return the amp and get a refund from TMR. It sounds like that Pass is a lemon!