Kicker 44KXA2400.1 Mono subwoofer amplifier.
It delivers up to 2,400 watts RMS of power.
The amplifier uses efficient Class-D power.
It is a one-ohm stable amplifier.
Features include a variable 24dB subsonic filter and Fail-Safe Integration Technology (FIT2) circuitry. Only used for a a few minutes. $400