Voices sound weird through iPhone 11 speakers

iOS & iPadOS

I recently bought an iPhone 11, and one of the first things I noticed is the sound. Music sounds pretty good through the small speakers, but voices sound strange. It's not quite robotic, but they don't sound natural. The effect is much more pronounced with lower pitches. It sounds like the phone is bringing out the brassiness and glottal fry in men. It sounds like the phone is doing some hardcore DSP, and it's mildly upsetting. Is there a way to turn it off?