So I have this amp called Alpine MRV-F300. It is a 4 channel 50w per channel or 75w(with 4 ohms) and the front left speaker does not work. I am installing with an aftermarket Duel: Flip Out 7 Inch Head Unit, and I've checked all connections at least to the speaker and to the RCAs to the amp are working fine. All 3 other speakers are installed and I need help finding out what I can do to fix this? I really don't want to take it out and get it fixed because I already have the amp down in my body in my jeep. Any help is great! Maybe it's an RCA issue? Maybe I don't know.