The legendary SM57 cardioid dynamic instrument microphone is now available with the X2u USB Signal Adapter, which features built-in headphone monitoring with zero latency, and easy controls to balance microphone and playback audio.Digitally record wherever and whenever your computer takes you - just plug and play for better-than-CD quality instrument reproduction.SM57 MicrophoneTypeDynamicFrequency Response40 to 15,000 HzPolar PatternUnidirectional (cardioid), rotationally symmetrical about microphone axis, uniform with frequency.Sensitivity (at 1,000 Hz)Open Circuit Voltage: -56.0 dBV/Pa* (1.6 mV)*(1 Pa = 94 dB SPL)ImpedanceRated impedance is 150 ohms (310 ohms actual) for connection to microphone inputs rated low impedance.PolarityPositive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3.ConnectorThree-pin professional audio connector (male XLR type).CaseDark gray, enamel-painted, die-cast steel with a polycarbonate grille and a stainless steel screen.Net Weight (without cable)284 grams (10 oz.)X2uFrequency Response20 to 20,000 Hz +/- 1 dBPower RequirementsUSB-powered, 500 mA, maximumDigital Noise Floor (20 Hz to 20 kHz, A-weighted)Minimum MIC GAIN setting: -81 dB FSMaximum MIC GAIN setting: -78 dB FSSampling Rateup to 48 kHzBit Depth16 bitPeak Signal Indicator (Tri-color)OFF: -30 dB FSGreen: ?30 to ?12 dB FSYellow: ?12 to 0 dB FSRed: >0 (digital converter clipped)Adjustable Gain Range40 dBHeadphone Output3.5 mm (1/8 inch) X2u USB adapter is plug-and-play, compatible with Windows 7, Vista, XP, and Mac OS 10.1 or later 16 bit, 48 kHz resolution Genuine SM57 vocal microphone Integrated pre-amp with Microphone Gain Control allows control of input signal strength Zero Latency Monitoring for real-time playback and multi-tracking without disorientation Headphone jack for monitoring with 1/8” connectivity Monitor Mix Control for blending microphone and playback audio 16 bit, up to 48 kHz sample rate for better-than-CD quality audio