The M Series has become the accepted standard for affordable, reliable reference and measurement microphones that are accurate in the time domain and frequency response. They are remarkably stable with respect to temperature and atmospheric conditions and are optimized for clean, very fast impulse performance providing accurate wideband response with virtually no handling noise.Frequency Response: 5Hz to 30kHz 1/-3dB Polar Patern: OmnidirectionalSensitivity: 50mV/Pa Pwer Requirements: 6V Battery Type P28 (2CR-1/3N, 4LR44 or eq.)Max Acoustic Input: 138dB SPLNoise: 22dB SPL equivalent (A weighted)Cost effective measurement microphone Ideally suited for on-location acoustical measurements including loudspeaker design and quality control, sound system setup and troubleshooting, room acoustics, or any application where an accurate free-field measurement microphone is required and portabi Microphone body opens for replaceable battery access, with a battery life of 300 hours. Omnidirectional polar pattern. Flat frequency response, fast impulse response and exceptional polar characteristics. Used by SMAARTManufacturer:EarthworksModel:M30BXMPSKU:I291465-N-0-WHXAUPC: 827517140445We are Chuck Levin’s Washington Music CenterSince 1958, Chuck Levins Washington Music Center has been the trusted destination for musicians and audio professionals across Maryland, Virginia, and Washington, D.C. Family-owned and operated, our legendary music store delivers Everything in Musicfrom instruments and recording gear to pro audio, rentals, and repair services.Our team of musicians and industry experts lives and breathes gear, helping you build the perfect setup for your next performance, studio session, or installation. As an authorized dealer for top brands, we also offer our award-winning CHUCKSCLUSIVE lineexclusive, limited-edition instruments and collaborations recognized with the NAMM Top 100 Dealer Innovation Award for redefining what a music retail experience can be.Chuck Levins isnt just a storeits a community built by players, engineers, and creators who share a lifelong passion for sound. Stop by our legendary Wheaton, MD showroom or contact us anytime for expert advice, product questions, or the best possible deal on your next piece of gear.