Id be looking into a new alternator too. I had to up the amps on mine when I had 3 12" w3's in my old Blaze. A powercell wouldnt hurt either with all that it will keep things consistant too. It may cost a little more really not a ton tho these days but it will be sooooo worth it. I know not a battery answer but will help you from going through batteries or burning up alternators faster. I went through a few of those the first few years.