The only way we have found to lower the base is to put about 5 inches of rolled up sweat sock into the tube at the back of the radio. This reduces the size of the chamber which creates the base and the radio sounds much better. Roll the sock lengthwise... then slide it into the tube from the back on the radio.
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The Bose Qc15 have more NATURAL bass. The Beats have LOUDER bass. It all depends on which one you want. Neither of them are considered 'Studio Monitor' headphones. For that, look for headphones from AKG, Audio-Technica, Beyerdynamic, Shure, Fostex or KRK.
Does the car have a separate subwoofer? If so, check out if it has become damaged/disconnected.
Usualy I use Bass-5 Gain-9 Mids-7-8 Treble-10
Bose may have the best sound quality, but be sure to look at all the aspects. (battery, bass, price, comfort) and then decide on the best one for you.
It depends on what kind of speaker you want for your car and how much money you are willing to spend. Bose is probably the best speakers you can buy but is expensive. Kenwood and Polk Audio make good subs. If you want a lot of bass these are the best choice.