A few years back I had a local shop do a complete audio set up on my 2012 camaro. It was 4 8 in subwoofers and I am trying to sell them but have no idea what brand they are. I can not find any information on the manufacturer anywhere on the back of the subs all I have to work with is the logo on the dust cap of the letters AM. If you have any ideas on what brand they may be let me know. Thank you.