I received the ABM112H-PN EVO-IV today.

It sits just right proportionally with my CTM30. Makes for a much more compact little stack. It's much easier to move around, as it's lighter and smaller than the RM210/115 stack (duh! It's a single cab as opposed to a stack), even though the stack is strapped down on a small furniture dolly.
Now the important stuff!
The RM stack sounds warmer, but the ABM112 has deeper lows. The ABM is punchier and more articulate. The RMs sounds a little more vintage-y, and the ABM is slightly more modern. The RM's highs seem to be more present, but rounded. The ABM's highs seem to be a little more strident. I'm thinking, if I'm playing more contemporary music, I would go with the ABM, but if I'm playing classic rock or blues, I would use the RM cabs. The Mid Shift switch, which was barely noticeable change with the RMs, is much more noticeable with the ABM. The Bright switch is noticeable with the ABM, but it is more noticeable with the RM cabs. The Bass Shift switch seem to respond about the same on either cab sets. Higher distortion sounds better with the ABM, but the lower distortion/edge of breakup seem better through the RMs.
My 5 string and BEAD sound better, tighter through the ABM, but those aren't used as much as Eb Standard or Drop D tunings. I think the 5 string and BEAD sound better through solid state preamps, than tube. I need to get the MAG300 out to test it on that amp. I have the Studio 10 readily available and I compared them through that amp. The CTM/ABM was deeper, but the Studio was tighter overall and responded better.
While my taste leans more towards the RMs, but ABM has something I like, but in a slightly different way from the RMs.

It sits just right proportionally with my CTM30. Makes for a much more compact little stack. It's much easier to move around, as it's lighter and smaller than the RM210/115 stack (duh! It's a single cab as opposed to a stack), even though the stack is strapped down on a small furniture dolly.
Now the important stuff!
The RM stack sounds warmer, but the ABM112 has deeper lows. The ABM is punchier and more articulate. The RMs sounds a little more vintage-y, and the ABM is slightly more modern. The RM's highs seem to be more present, but rounded. The ABM's highs seem to be a little more strident. I'm thinking, if I'm playing more contemporary music, I would go with the ABM, but if I'm playing classic rock or blues, I would use the RM cabs. The Mid Shift switch, which was barely noticeable change with the RMs, is much more noticeable with the ABM. The Bright switch is noticeable with the ABM, but it is more noticeable with the RM cabs. The Bass Shift switch seem to respond about the same on either cab sets. Higher distortion sounds better with the ABM, but the lower distortion/edge of breakup seem better through the RMs.
My 5 string and BEAD sound better, tighter through the ABM, but those aren't used as much as Eb Standard or Drop D tunings. I think the 5 string and BEAD sound better through solid state preamps, than tube. I need to get the MAG300 out to test it on that amp. I have the Studio 10 readily available and I compared them through that amp. The CTM/ABM was deeper, but the Studio was tighter overall and responded better.
While my taste leans more towards the RMs, but ABM has something I like, but in a slightly different way from the RMs.







