Description
Grace M900 Headphone Amplifier/DAC. In Excellent Condition. Tiny Box, Huge SoundThe m900 is a portable, desktop friendly headphone amplifier / DAC / preamp combo designed to give audio professionals and enthusiasts musical and transparent audio playback from USB, S/PDIF or TOSLINK sources. For small DAW studio setups, portable laptop editing or mixing rigs, or just pure playback enjoyment, the m900 provides the same analog and DAC quality as our large monitor controllers, but in a small, rugged and surprisingly affordable unit.Incredible DAC PerformanceThe m900 DAC uses the latest generation AKM 4490 chip, which features 32-bit processing and supports sample rates up to 384kHz PCM or 256x DSD. The USB interface operates in asynchronous mode allowing the m900 to be the clock master which makes the system immune to USB bus jitter. S/PDIF and Toslink inputs allow the m900 to enhance to any DAW interface with true reference quality D/A conversion, headphone monitoring and stereo speaker control.Intelligent Power Supply DesignAn intelligent power supply design allows for two power operation modes – LOW and HIGH. LOW power mode is from USB connector #1, which provides bus power along with data, allowing the m900 to operate from a single connection to your computer. HIGH power power mode is available by connecting the included 2A USB DC power supply to the USB connector #2, which provides additional power for harder to drive headphones.Superb Audio PerformanceTransimpedance amplifier topology coupled to a zero ohm output impedance driver provides headphone performance that is incredibly spacious and transparent with a tight, enveloping low end. Our latest generation crossfeed circuit rounds out the design by simulating an acoustic listening environment in the headphones. Familiar tracks become new again with surprise details, while audio production tasks like tracking, mixing and editing happen faster and easier.After many years of honing our DAC and headphone amplifier designs, the m900 distills the best of what we’ve learned in a compact, rugged and simple unit. Whether in the studio, on your desk or on the road, the m900 will bring you closer to the music you love.USB, S/PDIF and Toslink digital inputs, supports up to 192kHz (Toslink up to 96kHz)Asynchronous USB interface for jitter free computer audio playback, supports up to 384kHz PCM and 256x DSDDual zero ohm output impedance headphone outputsUnbalanced level controlled outputs via RCA for connecting to a stereo monitor systemCompact, portable chassis perfect for travel, desktop or studioMono mode, Left minus Right mode6 monitoring modes: stereo, L&R swapped, left in both channels, right in both channels, left channel only, right channel onlyChannel balance adjustmentLow power mode via USB Bus powerHigh power mode via included USB 2A power supply4 different DAC filter settings to tailor playback performance to personal preferenceSimple user setup menu for setup and calibration7 segment LED display displays level and setup menu informationLarge rotary encoder for volume control and setup menu navigationMade in Lyons, CO USATHD+N AT MAXIMUM VOLUME, 1KHZ, 22HZ-22KHZ BW@1.0V out, no load<0.002%@1.0V out, 32 Ohm load<0.010%INTERMODULATION DISTORTION SMTPE/DIN 4:1 50HZ, 7KHZ@1.0V out, no load<0.008%@1.0V out, 32 Ohm load<0.009%FREQUENCY RESPONSE +/-3DBFs=96kHz0.5-45.9kHzDYNAMIC RANGE20-22kHz bandwidth112 dB20-22kHz bandwidth and A weighting filter115 dBOUTPUT NOISE20-22kHz, volume=0-90-106dBVA weighting filter, volume = 0-90-109dBV20-22kHz, volume=90.5-99.5-96dBVA weighting filter, volume = 90.5-99.5-98dBVCROSSTALK100Hz<107dB1kHz<98dB20kHz<72dBATTENUATION RANGE0 to -99dB, 0.5dB stepsCROSSTALK TRACKING ACCURACY+/-0.05dBMAXIMUM OUTPUT LEVEL, NO LOADLow Power Mode+14.1dBV (5.1V)High Power Mode+15.5dBV (6.0V)IMPEDANCESHeadphone Output0.08 OhmsLine Output47.5 OhmsINPUT LOCK RANGESAMPLE RATELOCK RANGES/PDIF44.1kHz43870-45420Hz48kHz46590-49220Hz88.2kHz87760-90830Hz96kHz93520-98430Hz176.4kHz175700-181640Hz192kHz187050-196380HzTOSLINK44.1kHz43900-45410Hz60Hz48kHz46590-49190Hz60Hz88.2kHz87840-90830Hz60Hz96kHz93520-97530HzUSB supported sample rates44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384kHzPOWER CONSUMPTIONMax, High Power mode8.0WMax, Low Power mode2.5WDIMENSIONS4? x 5.25? x 1.8?HEADPHONE OUTPUT POWER / LOW POWER MODEOUTPUT POWER MWS/PDILoad Resistance Ohms1 Channel Driven2 Channels Driven48022814045163109020350100326001755056028030083836004040
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