06 subaru baja aftermarket stereo no sound?

I bought a 2006 subaru baja sport with no stereo , so I put my kenwood in it, bought the wiring harness, matched all color wires , plugged it in , stereo turns on and shows that music is playing but there is no sound , does it maybe have a stock amplifier i need to by pass? Help!?!?!?!?
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