The Earthworks M30BX is a self-powered version of Earthworks' original M30 omnidirectional reference microphone. This model delivers the same calibrated +/- 0.5 dB performance across the standard audio spectrum as the original M30 but eliminates the need for a separate external phantom power supply and preamp. Bias voltage for the condenser capsule and power for the integrated pre-amplifier are supplied by an internal AA battery (included). Special low-power circuitry provides up to 1500 hours of balanced line level output from a single battery. Earthworks M30BX Package includes padded plastic hard shell carrying case, microphone clip, XLR-to-RCA adapter, and battery.

Earthworks M30BX Specifications:

• Polar pattern: Omnidirectional
• Sensitivity: 8 mV/Pa (-42 dBV/Pa), or with 14dB gain 40mV/Pa (-28dbV/Pa)
• Frequency response: ±1dB 9Hz to 27kHz, +1/-3dB 5Hz to 30kHz
• Peak acoustic input: 132dBSPL with 5k ohm load, or with 14dB gain 118dB SPL
• Noise: 27dB SPL equivalent (A weighted)
• Min output load: 600 ohms at pin 2 and pin 3
• Output: XLR (Pin 2+) Will drive single ended input -- will drive most sound card inputs directly
• Earthworks M30BX Power requirements: AA 1.5V battery (2 months- 1,500 hours)
• Earthworks M30BX Dimensions (L x D): 215mm x 22mm (8.5 x .860 inches)
• Earthworks M30BX Weight: 225g (.5 lb)
• Earthworks M30BX Color: Black