I have a 96 cobra,the person who originally had the car pulled out the mach 460 sound system,put in a diff system and when they sold to the to the previous owner they pulled their system out leaving front speakers,tweaters,and the 6x9's in the back,I have satellite radio on my new head unit which is a sony,well all I get with the cd player on is highs on all my speakers,with fm radio all i get is sound from the rear speakers,and with satellite all i get is sound coming from the tweaters and when you adjust the volume it either goes to its max which is like 10,and when you turn it down it just turns down the volume completely...anyway to fix this? and like i said,in the trunk all the stock amps are removed.