Running Benchmark AHB2 in bridged mode and 4 Ohm Speaker

There's a bit of anti-bridging hysteria on this thread.  I've run bridged, vertical bi-amp and regular and the idea that bridging is necessarily bad is silly.  Current certainly doesn't go down in bridged mode.  Watts are volts times amps and volts = amps times impedance.  An amp that can put 100 watts into 10 ohms, say, means that it is putting 3.33 amps at 33.3 volts into the speaker.  If you bridge it and get 200 watts into the same load the current has gone up.  In this case the formula for current is the square root of the watts divided by ten.  The current for 200 watts is the square root of 20.  For 400 watts it's the square root of 40, etc.  

Keep in mind, too, that the amp is only driving one speaker so it's not working as hard for the same volume.  There is certainly the potential for problems with low impedance loads but I've never experienced it.  I'm running two amps bridged mono into 4 ohm speakers now, have been doing it for 6 years and have never had a problem.  I like the option of being able to buy a second identical amp if the first one is a little underpowered.  

jon_5912, When you bridge 33.3V into 10ohm speaker you'll get 66.6V and 6.66A making 400W.  Bridging quadruples power (since it doubles the voltage).

How much power the amp can actually put out will vary.  My point was just that bridging increases the watts an amp can deliver to a speaker and increasing watts means increasing current.  

increasing watts means increasing current.

Benchmark clearly states in it’s specs:
Not bridged
100w into 8ohms
190w into 4ohms =Clearly very close to doubling it’s watts, good current

Bridged:
380w into 8ohm
480w into 4ohms =Nowhere near doubling it’s watts, current diminishing.

Clearly the "not bridged" AHB2 is pushing current better because it’s closer to doubling the wattage into 4ohm, and therefore keeping the amp FR flat into varying speakers loads and not sounding like a tone control. Like the bridged would, regardless of how many more watts it has up it’s sleeve.

Cheers George

It is also possible that 480W limitation comes from power dissipation of the output or power supply (29A max current seems adequate) and is not relevant, unless one listens to continuous sine waves.  Music has very low average power while peaks might still reach close to 800W.