Originally Posted by Jim C
Do the MB500 / 800 series have the same characteristic as the old RB / MB series in that they sound different when pushed? Also, can I assume that the MB500 does offer a lot of womp compared to the above mentioned TH500?
The MB amps definitely don't do the 'riding the rails' thing-that was a property exclusive to the original RB line with it's deliberately undersized power supply. Having said that I've not tried a new RB head. Not sure about those but the manual talks about 'oversized power supply capacitors' etc. which leads me to believe it's a clean headroom machine as opposed to the originals.
I've got an old 800RB and a new MB500. They're quite different. The MB is much cleaner and wider where the old RB is dirtier and mid-focused. The MB doesn't hit the rails, it simply limits itself like other micros when pushed too hard(but it's very loud) where the old RB starts to sound pissed-off.
However, the baked-in sound of them is similar in the upper mid/lower treble areas. The shared DNA is obvious.