Something's not right. Always fun to deal with the staff at those places.
We bought a Roadview 10.4 inch drop down dvd for our 2007 Dodge van. We had it installed at curcuit city. They told us we had to pay an additional $50 for some kind of reciever to run this thing to the van's speakers. We have to turn the thing all the way to max to hear it and there is a low frequency hum over it. The hum causes a slight variation in the picture (or purhaps the picture causes the hum, I don't know) But the unit alos has dome lights which are supposed to work as well and do not.
It this all normal? Do drop down dvd's in cars have these issues?

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