Sony Xplod 1100 Watt Max 10" Subwoofer, XS-L100P5W Car Speaker "cd player loses volume" Questions

...requirements of the ipod and car stereo. If this can read Mp3 or Mp4 or any format as it was before. Is your radio and cd player have sound when you play it. If not your Amplifier is not

...cd player, two 1100w 10" sony XPlode woofers hooked up to one l000w sony XPlode amplifier, It was working wonderful for more than 3 months til today. When I turn it on at a low volume it works fine, ...