What is Reddit's opinion of Function Generator?

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Use a signal generator app.

Android

Just installed that one, seems to work well. Lots of option, free, no bullshit.

iOS

Looks good, but I don't have anything with iOS to try it on.

So I'm guessing couldn't do this at home with this app, this amp, a decent woofer and a glass plate?

Run an app through an amp. For the transducer, you're on your own, but you could start with an old speaker with a disc of cardboard glued partway down the cone.

https://play.google.com/store/apps/details?id=com.keuwl.functiongenerator&hl=en_US&gl=US

Apple App Store

Hear a certain sound?

Have you tried smartphone apps like a sound generator or a waveform generator where you can have your phone play a sound of any pitch?

https://play.google.com/store/apps/details?id=com.keuwl.functiongenerator

There's a ton of similar apps.

This is the best one i've used.

https://play.google.com/store/apps/details?id=com.keuwl.functiongenerator

It can generate two signals at the same time, modulate either frequency or amplitude, and allows for custom sweep ranges as well (which is GREAT when testing a crossover)

You may even be able to use your cellphone

https://play.google.com/store/apps/details?id=com.keuwl.functiongenerator

Just use a frequency generator. Like https://play.google.com/store/apps/details?id=com.keuwl.functiongenerator . Hint: to generate overtones you need to add a 2nd frequency.