How do you feel about this audio upgade? I can honestly say; that I'm not impressed, especially since my SO has an XC90 with a Bowers and Wilkins which is amazing. I feel like the equalizer does absolutely nothing; and there is really minimal changes using the tone controls. Is there a possible software update I'm missing? Additionally, I feel like I can turn it up as loud as it goes; and its not "too" loud. What is your opinion or observation with the Harman Kardon upgrade in your XC40?