I ordered a MP40 QD driver for a noisy MP40 that I had... I didn't expect a miracle but was hoping it would be at least a bit quieter. Before I could hear it a couple rooms away and couldn't put it on pulse or wave mode at all as I could hear the whine of it winding up and down right across the house.
With the new driver it is virtually silent. I am super impressed. I can't hear it at all. If I put my ear against it I can barely hear it. I don't understand how just changing the driver can make such a huge difference. It's still the same motor... but I'm happy about it.
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