JVC Mono Class AB Amplifier 500 Watts The KS-AX201 is a 2-Ohm stable Mono amplifier with 500 Watts Max power output and is perfect for connecting a single or pair subwoofers. It features high and low level inputs for connection to a factory or aftermarket stereo plus a low pass filter for use with a connected subwoofer. The CEA-2006 Compliant 250w RMS @2ohms is perfect for a humble system that does not require loud booming bass. Instead, the KS-AX201 is for the system that simply needs to fill the lack of low end.