My FP-13k had no issues tripping 16C breakers at 230V and playback at high levels dimmed the lights in my HT room (long 15AWG runs).I doubt very seriously I'm using all the power my FP20k can dish out. Running mine on a 30a 240v circuit. You'd be amazed how many guys on here actually think they're dump 5kw-10kw of continuous power into their system on a 15a 120v circuit.
Once I hooked it up to a 32A 230V circuit and tested it to its bones the main input transistors of the PSU blew up (~35$ in damage, note that this was the 2013 model with the old PSU with 4 fans).
30A on 240V gives you about 6KW of sustained power output at 85% amp efficiency, which could probably melt 8 21ds115 if you keep that up for long enough. People overestimate real long term average power a lot. Modern high power touring amps are 'only' made to sustain maybe 1/4th of their burst power and that's totally fine, because it's a good match for subwoofers, because those also just handle a fraction of their pogram power if you're talking (real, actual) long time average.