Where are the Neg. Speaker wires on the 14 pin. radio. [Archive] - Toyota MR2 Message Board

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Hello, I am trying to install my Pioneer AVH-3300bt in my 1991 Toyota MR2 Turbo. I guess I have the premium sound but it came with a single din cassette. I have most of the wires hooked up but the sound is tinny and very low. When I try to turn it up it starts to distort. I