A 15a breaker can pass peaks of 45a without much issue, breakers trip on the longer-term power (mostly).
Amplifiers that have few capacitors are relying on the grid to sustain them, many Class D units like inukes and the one listed fall into this category.
If the grid sags, so does the output.
This clipping is really only noticeable on subwoofers, and only when playing at nuclear SPL with beefy drivers. Tweeters and mids not so much...
There are others like the FP's and PowerSoft's and iTech's that split the amplifier into two main sections:
the power supply which produces a DC-like signal and the output stage that feeds the speaker;
in this way they can add capacitors to buffer a weak breaker and small awg (up to a point), and/or line-sag, and/or implement PFC.
Class A & A/B & H "old-school" amps use 2 sections as well, but they don't use a 99% efficient SMPS, they use an inefficient bridge-rectifier and 15lbs of heatsink and a 25lbs blob of copper, nor do they use a 99% efficient output stage. Thus they are only like ~0-50% efficient... rather than 90's efficient. They are so inefficient that their burst and the rms are really close together. Nobody wants 14kW of heat to make 14kW of sound!
Unless you have a smelting factory in your backyard and a million dollars... the only way you are getting to 14kW per channel is by burst-only, neither the fuse nor breaker nor grid can handle it long-term, it's gotta drop (and it does...)
That's totally fine though because 99% of drivers can't handle 7kW rms (2.8kW long-term) and 14kW burst, they "typically
" bottom out or smoke BEFORE
the amp gives up the ghost too.
Nearly all plate-amps are junk IMO. Either too weak or lack DSP, or both