very good point. A speaker with a sensitivity rating of 3 DB more than another with have 50% more volume. So for example, a speaker with an SPL (sound pressue level) of 98 will stay clean at condierably higher volumes than one with an SPL of 95. But then again, thats not the only criterea to look for when buying. The other you can't look for, only LISTEN for. But nevertheless, always look at the SPL spec of any speaker you're considering buying and compare. In cars, the ability to get loud and stay clean is more important than most other factors due to the way road noise drowns out the low end causing you to keep the bass and volume cranked.