Running Benchmark AHB2 in bridged mode and 4 Ohm Speaker

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.  

Sorry:  Can't talk yourself out of that one sunshine.

Cheers George

What would have been good to see is this simulated speakers load graph which is "non bridged" vs the bridged on the same simulated speaker load graph.

Non bridged is good showing good current ability.
https://www.stereophile.com/images/1115BAHB2fig01.jpg

I would bet looking at the wattage's I posted before, the "wavy black line" in the graph above, would be far more wavy with the bridged than the non bridged.
But were’re never ever going to see that with the same test equipment now.

Cheers George

The Stereophile graph referenced above is done at 2.83V which is equivalent to 1W/8ohms and 2W/4ohms. 
Obviously, whether bridged or in stereo mode it won't be effected by any insinuated current limitation.
What will effect the simulated speaker load is higher output impedance - which is doubled with the bridged amp - but because its already usefully low this won't make a substantial (read audible) difference.
It certainly won't turn the bridged AHB2 into a tone control - which is a ridiculous exaggeration - especially in comparison to any tube amp or many other SS amps for that matter.