The Sony STR GX57ES is a home stereo receiver designed for use in home theaters. The stereo receiver features 230 watts of power, dual channels, and audio-visual connection options. The Sony 230-watt receiver is equipped with dual video inputs and dual video outputs. Audio outputs for the stereo receiver from Sony include video/audio-out, speaker A/B-out, and record-out. The two-channel receiver also offers headphones-out, center-out, rear-out, and pre-out. Multiple power output options are available for the stereo receiver. The Sony STR GX57ES is capable of operating at 2-, 4-, or 8-Ohm impedance with a different two-channel wattage output for each impedance level. At 8 Ohms of impedance, the Sony receiver generates 115 watts of power per channel. At 4 Ohms of impedance, the Sony 230-watt receiver produces 170 watts of power per channel. When operating at 2 Ohms of impedance, the Sony receiver offers 220 watts of power per channel. The two-channel receiver uses a frequency response range of 30 Hz to 15 kHz, up to 38.3 dB sensitivity, and up to a 300-Ohm balanced antenna. The Sony 230-watt receiver measures 17 inches wide by 5.85 inches high by 14.75 inches deep with a unit weight of 27.9 lbs.