I think you will be very happy with your X250.5. I ran mine for the first five days around the clock at low volume. The bass quality will improve after about 3 days and the top end will smooth out after 5 days or so. I have not noticed a decrease in sound quality when the amp goes out of class A operation, but I have only been able to get the needle on the meter to move significantly at very, very high volumes. If your speakers are relatively efficient, you will remain in class A almost exclusively.
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