From what I've read in other forums, Sony put a different amp in after the 2011 or 12 year. If you have the part #, you can find a used on on eBay, or maybe through a junk yard. People have also said to disconnect the center speaker to make it sound better. The center speaker is supposedly mono, and that is all I seem to hear. The bass thumps regardless of how I set it, and sounds separated from the rest of the mix. I just bought a used 2016 Edge Titanium, and had I listened a little better wouldn't have bought the car. My stock radio in my 2011 Honda Accord was much better. Everything sounds muddy. The sound of the blue tooth is so bad that calls or driving directions are unlistenable. Every time a different song comes on through my iPhone there is a loud "pop" at the beginning of each song. I do a lot of traveling so a listenable radio is a must. This is the worst stereo I've ever heard. The dealer ship has a 7 day like it or return it, and I hate to say I will be returning the Edge due to to the poor audio system.