I have the concert stereo which has a cd changer in the boot. Its a 2000 X reg A4. Would this head unit have sufficient rca outputs to control amps. My sytem at the moment would be 2 x mono amps, 2 x 15" subs. 1 amp to 1 sub. Going through a line driver ( http://www.termpro.com/articles/wp-epx.html ) symmetry EPX2 by Rockford Fosgate. It has a massive 10 volt RMS output signal, whic if the concert headunit has rca's, then im assuming it can be done. Can anyone correct me if im wrong, as my stereo fitter says the concert headunit does not have any rca's and that i should use an aftermarket one.I really want to keep it standard... can someone please let me know asap thanks. Dom