My head unit is Kenwood mp3 player
i have one Infinity Kappa Perfect 12.1
4 ohm 12inch sub already in a Q Logic seal box . The box is 1 cubic ft.
The power handling is 350 w RMS and 1,400 w PEAK.

I am planning to get Infinity Reference 611a Mono subwoofer amplifier
456 watts RMS x 1 at 4 ohms (657 watts RMS x 1 at 2 ohms) .
The Kappa Perfect 12.1 is not Dual Voice Coil, so i can't wire at 2 ohm.

It has Full-range preamp outputs faciliate use of multiple amplifiers without
the need for noisy and expensive adapters or signal splitters.

The Reference 611a features a 12dB per octave electronic crossover,
allowing you to optimize bass performance based on enclosure type and subwoofer selection.

I am planning to get a Rockford Fosgate CP4CKDS
4-gauge amplifier wiring kit
With RCA patch cable and speaker wire

Do i need anything else?? Like cross over and cap?

 

As long as your head unit has subwoofer RCA outputs, you are good to go. That amp should be perfect for your sub.

 

with the Rockford Fosgate CP4CKDS wiring kit, do i still need crossover or cap?