That's a very informative input sir jhnkvn, everybody in this forum will benefit from that. I like reading and a long one is nice to read.

I used to be listening to Bass Music/ Sounds as others may call it, like Bass 305, Bass Mechanic and the like. There are bass tracks that delivers heavy and low bass notes during the whole duration of the track and so a capacitor like you said cannot give any help to my system. Even though I'am using a 1 Farad Cap, my headlight tends to dim and my amplifier tends to clip during those periods, a description of what you said. The capacitor got no time to recharge but to be discharged and so becomes another load to alternator.

I've googled about the Deep Cycle Batteries like Stinger, Optima etc.. I don't know how much they are selling those in audio shops, maybe even more than my Excel. Is it true that DCB's produces less current than the standard Lead Acid Batteries because it has less surface area than LAB's? Also, DCB's can survive to be drained multiple times while the LAB's will be damaged if discharged completely. I don't know if that info is correct, here's the link:Charging System Basics

Based from your input, it seems I don't have to replace my Motolite Excel and a need for a capacitor if I have an ample power supply coming from the alternator. I guess 110A-120A would satisfy my ampliers power demand. May I ask sir if you have any idea how much it cost? TIA