I need help to try to find out this question. The official CD for SQ in IASCA only test the rigth and the left channel only, but wath happen if I have install in my system a 5.1 processor like the 3sixty of rockford, the central channel allways is going to sound when the cd test the rigth ore the left channel, so this meane the my car dosent pass this test ore it OK because is a central speaker and sould make sound for the left and rigth channel.