Sundown SAE 1000D. Kicker SX1250.1. Memphis PRD1000.1. Countless others. Are your subs Dual 2 or Dual 4? I assumed they were Dual 4, and would wire down to 1 ohm.
If they are dual 2, then Kicker ZX1000.1 or Sundown SAZ 1500D ran at 2 ohm instead of 1 ohm.