Car Audio   1. Car audio is no sound. 1) Check whether main channel gain is too low. If so, please adjust the main channel gain to proper level. 2) Check whether controlling wire is not connected right. Top>>   2. The woof is no effect. 1) Check whether wired remote is improperly connected. 2) Check whether low pass is not in the right level.   Top>> 3. The sound is incontinuous. 1) Check whether gain is too high, thus triggers the unit into auto-protection function. 2) Check whether the speaker is short-circuited.   Top>> 4.No woof effect when signal input. 1) The poles of L/R channel input is not connected correctly. Top>>   5. Indicator doesn't light up. 1) The fuse is burnt. 2) Check whether the power and control wire are not connected correctly. 3) Check whether the power plug is not connected correctly. 4) Low battery. Top>>   6.Poor sound quality and distortion. 1) Check whether gain is too high. 2) Wrong polarity connection on speaker input. Top>>   7. Abnormal sound. 1) Check whether power wire or signal wire become loose. 2) The fuse is burnt. Top>>   <<Back