I just bought DEH-X1950UB and Amplifier. The first time, I can hear only the sound from sub woofer. I think that the product has the problem. The technician suggest me to setting the sound to be " Full Range" . So, I can hear the sound normally from front speakers. However, I think the Factory default should be " Full Range " not " Sub woofer ". May be the customer will misunderstand that the product has the problem, no sound.