i checked all the wire connections and they seem good. as far as i know bose was not an option for the 98's but i am considering replacing mine with bose ones whether the new amp works or not. the sound is not really a rattling sound it's just distorted whe there's base. i think i have isolated it to the passenger side smaller speaker which is worrying me that the amp might not be the problem. the previous owner is my grandfather and i am very sure that he wouldn't do any listening that would blow out a speaker but is it possible they just blow out over time? i just ordered the amp from ed morad so hopefully theyre not blown.