dB indicator flashing red

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I understood that 0dB represented maximum power at full digital modulation. Is that other people's understanding too?

That's an interesting question to which I gave a fleeting thought when I upgraded from a 200 to a 400.  I'd assumed that was exactly what 0 dB meant, but then I didn't hear an obvious change in volume when added the companion 200 which would presumably have doubled the maximum power output to which 0 dB is referenced.

A supplementary question is whether 0 dB is referenced to the maximum rated power of the amplifier, or the maximum power that the configuration allows.  If it's the latter it would explain what I (didn't) hear because I used the configurator to limit the maximum power output of the 400 combination to the same value I was using with a single 200.