disconct ipod and then try it... sometimes when a song is recorded it is setup to play out of certian spearks like front left front right for example... also some are recorded where there is still music but the bass drownds it out ... disconect the ipod try it like that and if anything disconect the rcas that run to your sub amp and conect them to your highs and mids amp... sonys are notorius for there rca outputs to go out... pm me with any questions and ill see if i can help anymore...