its at least 5yrs old now. i bought it used, but it had no noise like this in my last car. and the only reason i didnt notice it in this current car (4yrs and counting) was until I had installed the new components in the rear. Now with all my highs coming from ear level, as opposed to foot, its really easy to hear the noise.
Ill still check it with a MM, by the way where should I be testing the resitance? One probe on the neg. terminal on the amp and the other to the bare spot on the chassis I chose as my ground?