While CONNECT:AMP is not everyone's idea of a great sounding amplifier, they are hearty and won't tolerate any speaker load abuse. If the amp is upset, it will back off the volume or shut down. There is adequate over current and temperature protection. Overall, I think that they are one of the most bombproof amplifiers on the market. While one can overload the Line-In, the power amplifier will not operate into clipping. This characteristic also minimizes the risk of speaker damage.

Note that I'm not trying to justify the original design, I'm only pointing out a fortunate characteristic of the amplifier.

Another lucky break for the original designer is that the CONNECT:AMP will not likely drive the speaker control boxes into saturation. While it's tempting to throw a large amplifier at this project, the big amp will saturate the control boxes and cause trouble.

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PSS, if you have a demo CONNECT:AMP, pull one room off of the control box abomination under the pretext of giving the customer better control in that room with the spare CONNECT:AMP. After a few days ask how the customer enjoys the control and if the room sounds OK. At this point you'll now if better control and better sound is important to the customer. Note that it is important to factory reset any Sonos unit before moving it from one system to another. -- Otherwise there will be a mess of mingled music libraries and online services. (Been there, done that, it was ugly.)