[. . . ] [. . . ] 4Dynamic Audio Delivery Parallel drive MOS-FET power supply supports high power and high sound pressure level. 4For Easy Upgrade + Power Amplifier Max. 120A Output Stage • Variable Bass Boost Control (KS-AX5101D) You can control your subwoofer’s bass boost level (45Hz/0dB – -18dB) for a customized sound. • Pre-Output Pre-output terminals are available for easy upgrade of your system. - MOS-FET Power Supply rade!Easy Upg drvn AX5100 Series Amplifiers 4Easier Installation & Control with One-Side Wiring Amplifiers are easy to install in various places, with terminals on one side, and side covers for a neat look. [. . . ] [. . . ]