I've got an 05 tsx. Im running a JL G4500 which powers 4 6.5 inch alpine type r's and a pg ryval amp running a JL 12inch sub. I think the next thing on my list is an equalizer to control the frequencies and was wondering if anyone else has done it. If so, is their anything i need to know before doing this. This is going to be the first time installing an equalizer ever. I've also had cars with aftermarket decks where i can control the frequencies.