Not trying to be "smart", but maybe your car is trying to save you from yourself! I don't know what a volume of 33 may sound like, but my stepson is now about half deaf (I am serious) from having those ground shaking speakers & sub-woofers in his vehicles. You could hear him coming 2 blocks away from home. Nice to be "cool" & have loud music playing/blaring from your car, but you will pay dearly with your hearing later. I am 75 & lost a lot of my hearing from working around jet aircraft for years, with no hearing protection, like available now. Some sound systems now exceed the decibels of jet engines. We didn't know better back then. Too late, I do now. I would think that modern cars have sound systems that should be more than loud enough, but to each his own. Sorry I can't be of help on your technical problem, but hope you heed my warning on how much volume human ears can take without permanent damage. Again, I am in no way trying to be a smarty, & trying to put you down, for having a nice audio system.