Got a strange problem with our 2020 Honda Accord Hybrid EX-L. The touchscreen sound controls (Treble, Mid, Bass) all audibly change the sound as you move from low to high, but the sub-woofer control does not. The sound system definitely sounds like it's missing the lowest bass frequencies. A local dealer told me that control behavior was normal, which I can't believe.

Hoping to get some info one way or the other from other owners before I drive up to the dealer where we bought the car - they're nice and reasonable, but further away.

Thanks in advance...