so this is the first stereo system that im wiring my self lucky me my other vehicles have had everything set up just plug and play. but now im starting from the ground up. I have a 97 explorer i upgraded the cd player to a jvc cheap but sooner or later i want a dvd player. anyways i just installed 2 kicker k68 and wired it normal. i wasnt gettin quite the bass that i had been reading about in reviews so i did a lil research. i found that it would be better to run them parallel. by the way the speakers are 4 ohms and so is the cd player. from what i read running them parallel would knock it down to 2 ohms which gives better bass???? I wish i could find if that is true but when i turn the volume past 20 they start crackling and i cant really tell if its picking up the lows. pls someone help if u need more info id be glad to give it thx in advance