Factory B-Stock items undergo the same rigorous testing as all our premium HeadAmp amplifiers. B-Stock items may feature discontinued colors or minor cosmetic blemishes that do not compromise the exceptional quality and performance of the amps! The GS-X Mk2 is HeadAmp's flagship amplifier for dynamic and planar magnetic headphones. Used by numerous high-end headphone manufacturers in their development labs, this headphone amplifier that gets the clearest sound possible from your cans. Our Take The GS-X Mk2 delivers the quickest, cleanest, most transparent sound you will find in a headphone amplifier, and does so regardless of the headphones you pair with it. You'll simply hear the character of the headphones themselves, and the connected source, as the GS-X does its' part to supply all the power your headphones need, without coloring the sound. Across the Board Performance The GS-X is carefully designed to provide the same level of experience whether listening with high sensitivity, multi-driver in-ear monitors, low-impedance current-hungry planar magnetic headphones, or low-efficiency, high-impedance headphones. The combination of extra low-noise transistors, careful part matching, and an adaptable gain setting work together to give your entire collection of headphones just what they demand. With a circuit that has evolved and matured over a 15-year period, the GS-X Mk2 is the most powerful, linear, and transparent amplifier that we have ever produced. Pushing up to 6W of class-A power into balanced headphones, the GS-X Mk2 can tame the toughest headphone loads on the market, while its low-noise circuitry delivers an equally brilliant performance with sensitive in-ear monitors. Only the Highest Quality The GS-X Mk2 is a carefully handcrafted piece of audio equipment, with painstakingly matched components, and the highest standards for build quality in the business. Every GS-X Mk2 is tested extensively throughout the build process, as well as before, and after an extensive burn-in process to ensure the best possible performance. More Than a Headphone Amp In addition, the GS-X Mk2 makes a fine preamp for your stereo speaker system. With its high input impedance, low output impedance, multiple I/O options, 3-way gain control, and precise volume control, the GS-X Mk2 can fit into almost any stereo rig, and provide the same wonderfully transparent sound output that it does with headphones. Features • Balanced 4-pin XLR Output • 2x SE 1/4" Headphone Outputs • Low, Medium & Hight Gain Options • Input Selector Switch • 2 pair Single Ended RCA Input • 1 pair Balanced 3-pin XLR Input • 1x stereo pair RCA Active Pre-Amp Outputs • 1x stereo pair XLR Active Pre-Amp Outputs • 1x stereo pair RCA Loop Outputs • 1x stereo pair XLR Loop Outputs 3 Year Warranty on all Parts and Labor Technical Specs Output Voltage +/-20V Dual Mono THD0.003% / 1KHz Power Output (HP/Balanced):8W/25-ohm, 6W/50-ohm, 3W/100-ohm Operating Voltage115/120VAC Power Consumption40W Dimensions/WeightAmp: 14.5x9x2.5”, 5lbPower Supply: 14.5x9x2.5”, 7lb Downloads HeadAmp GS-X mk2 User Manual