I also have the MF2500A and am considering the 140. I am also curious to hear some responses.
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The Premier 140 is just simply in another class.
My only caution to you is the fact that thiels (the 3.6 rock!) like power.
Do you have a very very large room ?
Loss of bass is not an issue. It's control. You will experience another diemension in sound !! Very aspect INCLUDING bass.
If you get a chance listen. You may never purchase another (2-channel) power amp again !