I'm got a good price on a 4x10 that needed to have one speaker replaced. When I bought it, the bad speaker had already been removed. I just opened up the cab last night and could only find two wires going to the place that the speaker should be. All the other speakrs seemed to have 4 wires going to them. Is this right? Should there be four? This is an ampeg 410he. Thanks in advance.