Are there any ways to upgrade the stock audio system?

 

Use the google search terms and dig. Go to google; type in

//site:rl.acurazine.com audio upgrade

start varying your search terms..."audio upgrade" in this example. People have done things such as added a new subwoofer and screwed up the ANC so you definitely want to read those threads and solutions, which sound like they have to disable ANC

 

Thanks for posting this, I am curious as well... Let us know what upgrades you go with.