I have a plan to improve the dreaded HK audio system in my 2013 OB. The idea is to keep everything looking stock (stealth) but to reduce the muddy bass, install a real subwoofer, and improve the upfront sound stage. Options for dash speakers are extremely limited, so I have decided to keep the existing HK full-range speaker but use a crossover, limiting it to mid and bass frequencies down to ~100 Hz. Then I'll add a high quality tweeter with a crossover frequency that complements the mid-bass. Finally, baffling behind the dash speakers is almost non-existent, so I've devised a simple and inexpensive method to improve it. If all goes well, I will move on to the boomy door woofers and rear cargo subwoofer issues. The pics and write-up will take some effort, so I don't want to waste the time if others are not interested.