ive had one 300 watt alpine amp pushin my 2 alpine type S 12"s, and today i got another 200 watt alpine amp from my friend, so i wired them up and now they both turn on and the new amp bumps them, my old one turns on and says ER-3 which i looked up online and i think means excessive current? im not sure what that exactly means but it makes no sense that 1 would work and the other wouldnt since theyre both hooked up to basically the same wires