Question about car speakers?

Car Audio Question. Why are my rear speakers not as loud anymore?

• o i have my rear speakers hooked up to a 200w rms amp, 100w rms each speaker. They used to sound amazing, and would overpower my front speakers so that i couldn't even hear then (they werent hooked up to an amp, just to 50rms deck). Now when I turn my music on, the speakers arent as loud in the back anymore, and i can hear my front speakers (i know most people would think this is a good thing but they arent as good as the rear speakers). The amp thats going to the rear speakers is running (lights up), so i don't know why it isn't working. They are now just as loud as my front ones and less clear, which is usually a sign that they are not running off an amp. Is it possible that the amp isn't sending power to my speakers and the sounds frequencies or whatever are just passing through my amp, without any power increase from it? Thanks for any help I hope this is somewhat read-able.

• Answer:

  Let's check the obvious things first. Follow the amp's ground lead. Check it for any corrosion where it's connected to the chassis. Tighten the connectors on the amp. Next, fade the tuner to the rear & play some music. Get in the back seat & listen up close, see if the speakers are distorting. Next, get behind the rear speakers, check the connections & move the cones gently. The cones should move smoothly. Cars bounce around, connections work loose, corrosion builds up on them as well.