All done. Took it in to an upmarket radio place that does high end cars. Head unit stays obviously, but they changed out all the door speakers and dash top tweeters, except the rear ones as they are only used an much reduced volume. Doors have had some special dampening material fitted prevent buzz/ rattle. Also a small sub-woofer in the boot/ trunk, which unfortunately reduces it's size a bit and interferes with folding down the seats, but it's velcro'd in to be portable. And lastly a proper amplifier hidden away somewhere. They then set up the sound professionally on a lap top, and you are encouraged not to touch any of the stereo system settings. It now sounds incredible! Highly recommended, and not a huge amount of money considering what the car costs. Cost $3800 australian (USD2700/ BP1900). As a side line, I notice now there is no mute switch on the steering wheel or touch screen?What did your local car audio specialist say? Can't imagine it being a simple switch since the head unit needs to be removed and replaced.