If you want to stop the dimming and save your electrical system, you'll take with your audio supplier or installer about the proper value stiffening capacitor for your sound system. Whats hapening is your amp takes so much power from your battery that it causes your alternator to surge. The stiffening capacitor charges and discharges to keep your amp input voltage at its maximum resulting tighter harder and lower base. well woth the couple hundred bucks for a good cap. soory bout the long post, hope it helps some>
