BigMack

A band in the late 70's and 80's called "The Cars" used to mix on car speakers, since that's how most people were listening to music back then. Today, I mix on closed-back headphones (to tweak the EQ and L-R balance on the stereo tracks), and then I master on open-back headphones to get a little ambience since ear buds are technically not a closed-back headphone. The reason some car audio systems sound like crap is because most headphones have a frequency response of 20-20,000 Hz, but most car audio systems don't.