My mom happened to get a bunch of Pringles one day. On the front it said "Win a free speaker" if you bought 4 cans and if you had the receipt. Unfortunately, I didn't have the receipt so I couldn't order the speaker. I took things into my own hands and built something better.
Step 1: Starting
Surprisingly, I found a speaker that fit the can perfectly on the can. Fit the speaker on the TOP and install with glue.
Step 2: Amp
Next, if you have a amp, drill holes in the cap for the knobs. Cut the bottom piece of metal on the can out. Install amp with glue.