DD Audio C4.60 (AB class) power amplifier (4-channel).

DD Audio C4.60 (AB class, RMS 4x90 W x 2 Ohm) power amplifier (4-channel). 

The C Series Amplifiers offer the warm sound that Class AB amplifiers are known for, along with features such as band-passable crossover networks, high-end output devices. 
Four way protection circuit protects amplifier from over voltage, short circuit and over heating and dc offset protection protecs your speakers in case of a fault. 
The chassis design features a single side control panel giving the C Series an elegant aesthetic and makes cable management and audio adjustments easy for quick clean installations. 
* Remote subwoofer control is optional.