On my uncles 96 Blazer the sound is going out on the passenger side, front an rear speakers. He replaced the radio with an Alpine CDA-9826, but still has the problem. He thought maybe the speaker was blown, so today we tried hooking up a new speaker on the front passenger door, and it still isn't working. The sound sounds small, almost tinny. Like there is no body to it. Is there some sort of amp, or something between the HU and the speakers? I'm stumped... Possibly bad wiring? No clue here. Anyway, any help would be great. Thanks.