Hi I'm from Perth Western Australia. I love car Audio
I have a Alpine cd not sure of the model right now, arc audio black 6.5 component speakers front stage. 4 channel Rockford amp running the arc audio splits. a 2 channel old school 100x2 Rockford fosgate amp running a 15 rfp Rockford fosgate sub also old school. Like to up grade sub and amp. any ideas what to go for???