Lessee here...
High end home with subwoofers, so good quality equipment with lots of power, especially in the subs.
Amateur singers with wireless microphones, so people who don't know how to hold a microphone (see [Link: soundreason.org]), are likely to drop the microphone by accident and, recently, sometimes on purpose.

This tells me there will be blown speakers if you're using home audio equipment. You need VERY sturdy speakers, made for the pops and such that singers and especially amateurs will deliver. You might not blow the subs with underpowered amps, but when an amp clips, there's excessive high frequency audio, which can blow tweeters.

Use equipment made for the purpose. The cheap way out, or using stuff not made for PA, will teach you how PA equipment differs from home hifi.