Speakers cannot be connected because the radio does not turn them on. No, these are not secondary speakers. They are in stock. 1 speaker? Eh Connect all 4? Only if you want to hear very low tone and high distortion. The amplifier output cable does not turn the amplifier on and off when the car is on. Just save your money and get something better. So many other questions but no time. The sad thing is I ordered this a while ago and just had a chance to install it and I have 20 days past the 30 day return period. Was very busy right now, but hey. Just save your money and get something better
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