ive got an alpine cda-9807 in my car and when i was looking through the manual, i came across how to change the different bass and treble range frequencies.....i dont know much about audio but for bass i have 60Hz, 80Hz, 100Hz, and 200Hz options. i like tight punchy bass that sounds crisp, so which of these would be my best choice? also, for treble i can have it set to 10kHz, 12.5kHz, 15kHz, or 17.5kHz. for treble i like nice crisp high pitch sounds, but i dont know which i should choose for this. any help on this subject is appreciated, thanks.