A Portable Headphone Amp with Impeccable Sound Grace Design's m900 takes the stunning detail and flawless imaging of their flagship m920 headphone amplifier and packs it into a portable, bus-powered unit. But just because the m900 is portable, doesn't mean it's lacking. Experience jitter-free computer audio playback, with support for up to 32-bit/384kHz PCM and 256x DSD. Dual zero-ohm output impedance headphone outputs deliver spacious and transparent performance, while stereo unbalanced analog outputs make connecting to your stereo monitor system easy. Either way, four different DAC filter settings provide personalized playback. At Sweetwater, we appreciate the m900's simple setup menu and easy-to-read 7-segment LED display, and its large rotary encoder makes volume control and menu navigation a breeze.Grace Design M900 Features: 2-ch headphone amplifier and top-shelf D/A converter Portable bus-powered unit is ideal for travel, desktop, or studio Jitter-free computer audio playback with support for up to 32-bit/384kHz PCM and2-ch Headphone Amplifier with Stereo Unbalanced Analog OutputsSuppt f 44.1kHz-384kHz PCM 64X-256X DSD Audio - macOS/WindowsDigital Input via USBS/PDIF CoaxTOSlink