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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