Application specific bracket and hardware. Only needed when you are upgrading to a 2nd subwoofer in a Cam Am X3. The bracket and included hardware allows three MB Quart amplifiers to be mounted in the X3 (1 full range and 2 mono). To clarify, this 3rd amp bracket is only required when running two subwoofers. Purposely Engineered X3 Tuned Audio. Mounting System Amplifier 3 (2nd mono amplifier for subwoofer system).
