KRK RP4G3 4" High Performance Studio Monitors - Black (Pair) This Bundle contains: (2) KRK RP4G3 Powered Studio Monitors - Black High-frequency adjustment tailors the system to personal taste Bi-amped class A/B amplifier offering large headroom and low distortion ; Proprietary waveguide optimized for superior imaging Lightweight, glass-Aramid composite woofer delivers clear midrange and tight bass 1-inch Soft-dome tweeter provides pristine clarity and extended response up to 35 kHz