I use low efficiency Greenback 10s in a closed 2x10 cab which helps, to some degree, to keep the volume down. It still screams, but...I did a couple of one off gigs out of town, venue had a cab for me. I just hauled my Trinity 18 TMB head. The cab sounded good, but the speaker were very efficient, and I really had to keep it down for the blues gig. Not so much for the rock gig, haha, but the volume diff between 95db@1watt (my cab) was huge contrasted with the 100.5 db@1watt of the more efficient cab (which was 2x12).
So, yeah, I can understand having the VRM. Congrats on a great amp!
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