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Breaking-in a Pass Amp

Just got a Pass X150.5 power amp and will be running it constantly for 4-5 days before I listen to evaluate it critically. Out of the box 2-3 hours it's Ok but nothing exciting - good detail and opennness and very dynamic yet tonally bland, limited transparency, a bit sterile and not very involving.
What changes can I expect over time with "X" series amps and how long for them to reach their potential.
They are being driven my a McIntosh c2200 tube preamp and are powering VonSchweikert VR4JR speakers.
Thanks for your comments and suggestions.
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glenfihi
525 posts
 
No suggestions, but what a nice system you will have to listen too and bring in Christmas and the New Year. Let us know when you feel the amps have broken in and are sounding palatable.
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onemug
784 posts
 
"After only 36 hours they are already beginning to warm up, open up and relax a bit and sounding considerably better than out of the box"

I think you can expect more of the same to come. That was my experience with my XA.5's.
jl35
4,111 posts
 
For X250.5 told by Pass dealer; 4 days on continually, then 4 days of 16 hours on, 8 hours fully off (not standby). I also felt it improved a little more after a few weeks of regular use following the 8 day break-in.
syntax's avatar
syntax
2,193 posts
 
...it's Ok but nothing exciting - good detail and opennness and very dynamic yet tonally bland, limited transparency, a bit sterile and not very involving.
What changes can I expect ..

That's the way they are. There won't be big differences but you will get used to it and after a while you will like it.
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