The Class-D amplifier on the Crickit is pretty powerful, so you can make quite a bit of noise!
You'll get a lot louder audio from 4Ω speakers.
We recommend this speaker, you'll have to either poke wires into the connector, or cut it off and strip the wires to connect to the terminal block, but its nice and durable
This speaker is less expensive but you'll need to solder wires to the back
8 ohm speakers won't be as loud, but that's OK!
This speaker is inexpensive, but you'll need to solder wires to the back
The speakers below work just fine, but because the audio amp is pretty strong so you have to make sure not to damage the speakers by turning up the potentiometer on the Crickit to make the audio really loud.
If you're getting buzzy sounds from them, turn that little trimmer potentiometer down.
You can also use surface transducers if you like; attach/bolt/clamp the transducer to a surface: