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Aftermarket amp/sub install on 2018 X with UHFS

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My JL XD600/1v2 amp turns on but blinks green for 4 seconds then solid for 18, repeat. JL manual says that this is the power up mode and audio is muted.

Here's how I have it setup:

  • I tapped the blue and black subwoofer speaker level wires right before they connect to the amp.
  • These are then connect to the RCA inputs, the negative speaker wire to the white RCA (right input) and the positive speaker wire to the red RCA (Left input).
  • 1 gauge power from battery to dual fuse block, 50 amp fuse (per JL XD600/1v2 recommendation) to 4gauge wire into the amp. Amp is grounded to the frame from one of the factory ground locations.
  • Amp has ability for high frequency so no LOC needed (apparently)
  • Amp is configured to turn on when the stereo starts up, which it does do. Just never gets out of powering up mode.

Not sure if I should pick up an LC2i pro or if the amp is just bad at this point.

any advice is appreciated.