hi i have notice that my new subwoofers or amp start up strong with bass but after a while the bass weakings down like it lowers down dont know if some amps do this when they get hot after a while or can it be a bad wire hook up need help please
use a multi meter. what kind of car you got?sorry i ask but how do i check the voltage also how to check ground continuity to make sure is well ground it i did not do this my self i dont realy know much about on how to do this