I had a spare faucet aerator that I noted at the time could be used for something.

A few weeks ago I was refilling a laser toner cartridge. The refill kits come with a soldering iron looking thing that has a circular copper tip that you heat up [by plugging it in] then touching the plastic toner cartridge. It melts a hole in the plastic so you can use that to refill the cartridge with toner.

I noted that the heated iron's tip looked the same circumference as the faucet aerator. I put the two next to each other and it was an exact match.

So I heated up the iron and melted a hole in the Pearl's battery cover and the Seidio case. Then put glue around the inside edges of the aerator and the Seidio case.

Audio is super loud.

Cool, eh.