Very green newbie here, just installed the CV B54 amp and front Polk mm1 and rear Polk (5X7) speakers on my 15 RGS. Everything works, shows artist, volume level, but no sound at all. I know it's something on me, do I need a flash to fix this or possibly line levelers to get sound, or is it possibly just a matter of fine tuning the controls. Had everything pre-wired plug & play which made it easier to install. Amp was set to 4 channel. It was pre-set to my set up but did say it needed tuning. I'm sure/hopeful it's a simple fix, Any help and/or advice would be helpful!