Are the Prius c Two speakers that bad?

First impression driving from dealership brand new '14 C Two: wow the speakers are really horrible!

Then we got home and I ran a few audio tests and when set up properly they sound good enough not to be put into trash right away.

On frequency sweep: at the bottom there is no sound coming out until ~28-30Hz, and at the top do not expect much above 16kHz. There is a drop btw lows and mids but they show pretty flat response curve otherwise.

On drive match test: there are some issues on specific frequencies, but they are more or less matched.

Best settings for linear response with listening volume in 30-40 range: Treble +2, Bass +1

This on green speakers with ~5hr. I expect them to get better after burn in.

 

Not sure if your One has the same 6 speaker set up as my Two. You may have a 4-speaker.

Nevertheless, you can run the tests and determine what is an optimal set up for you.
here is a link to tests: The Ultimate Headphones Test

The tests useful for set up are "Spectral Flatness", "Driver matching" and low/high "frequency response". "Bass shaker" is useful in identifying loose speakers, but it is not likely to be an issue on new car.

If you have some hearing loss, you can use this test to map it out: Online Audiogram Hearing Test | Reliable & Calibrated

 

After ~40hr break in the treble had to be dialed back to +1