Do you have a question about the Kicker KSC670 and is the answer not in the manual?
Prolonged operation can cause overheating, fire, and damage. Use common sense with volume.
Use 16 gauge wire. Ensure source/amplifier is rated for 4 ohm operation.
Designed for free-air. Isolate front/back sound. Use factory locations or semi-isolated chambers.
Return defective merchandise to an authorized dealer or contact Customer Service for RMA.