1st check to see if the RCA's are plugged in if they are make sure the speakers are plugged in. Check at the amp and at the sub Alson check the input voltage switch. JL Audio Slash series amps have a high/low switch for your input voltage. And the last thing I can think of is if your using a remote wire to turn the amp in make sure the signal sensing switch is off. If your not using a remote wire turn it on....Hope this helps
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