Power – It’s all about power
Having a nice setup that’s loud is not all there is to a good car audio system. Anyone can get good audio with the proper amount of money. Some say brand matters others say common sense, you be the judge. One of the most common misconceptions about car audio is with respect to the power requirements of the overall system (your car’s other electrical parts pus the audio system). A powerful amplifier always means a huge need for power which a stock electrical system may not be able to deal with. Adding an audio capacitor might solve your problem but for a more permanent fix, try upgrading the battery and alternator so it can cope with all the added load. Also try to get an expert to design the system for you so you get a balanced system that works with each other. Mix economy and your wants to get to a compromise so you get what you want at the right price.