Worf, when you bridge two amp sections to drive one speaker the result is that twice the amount of voltage is being supplied to the speaker, and since one form of Ohm's law is I=E/R(current equals voltage divided by resistance), when the voltage is doubled the current(at least theoretically)is also doubled. This is the same as if the voltage remained the same but the resistance or impedance of the speaker was cut in half. So, it's sometimes said that the bridged amplifier "sees" a 4 ohm load(with 8ohm speakers)or a 2 ohm load(with 4ohm speakers), which isn't really correct since the speaker stays the same, although the extra current load on the amplifier is as if the speaker impedance was lowered.
Don't know what Rotel will say, but that's a fine amp(even if it doesn't have a "British sound")and apparently the resulting current hasn't caused it to shut down.
