Extremely distorted sound effects: Hardware Speaker frequency range?

I added 2 sounds to my game which have pretty low frequencies, and they sound quite distorted through the playdate's speakers*.

Other games seem to hold up at maximum system volume, but these two sounds sound terrible at 70+%. Especially the electronic_hum sound. Is it at the resonant frequency of the speaker maybe?
Simulator and headphones plugged into playdate sound fine.
sound_test.zip (86.5 KB)

Most noticeable when playing both sounds simultaneously

See attached demo project for the sounds.

*Note: I'm using a development preview unit pdu-01. Has there been any relevant revision to the speaker?

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