Lexus IS 2014+ :: Bass Line Is Louder Than Lead Vocals

I took delivery of a 2014 IS350 RWD last week. Mine has no navigation system, so it has the "Lexus Display Audio System." I almost immediately noticed that the bass (or more specifically the mid-bass) sounded excessively boosted. At first, I thought for sure that someone at the dealership had turned the bass tone control all the way up. It took me a long time just to find the tone controls in the audio system (the design of this system is a mess IMO), but when I finally found them, I was shocked to find that all of the controls were centered at zero!

I immediately turned off the DSP settings (surround and ASL) to make sure those weren't causing the problem.

When you listen to pop or rock music, all you hear is the bassline or bass drums. The bass line is actually louder than the lead vocals! It's an absolute mess. My guess is that the boost is centered around 200Hz. Adjusting the "bass" setting in the tone controls does work a bit. If I turn the bass almost all the way down, the system becomes barely tolerable. If I turn the bass down one more notch (as far down as it will go), the sound becomes very thin. The problem, of course, is that the bass tone control affects a wide range of bass frequencies, and not just the problem area centered around 200Hz.

So the bottom line is I can't do anything to fix it. I'm going to make an appointment at the service department next week too see if there's something wrong with the system, but I'm afraid they're just going to blow me off and say "that's just the way it is."