ATM250 Features Handles very high SPL at close range Big, warm low-frequency response with excellent presence Hypercardioid polar pattern reduces pickup of sounds from the sides and rear, improving isolation of desired sound source Durable, proven performance for professional applications Hi-ENERGY® neodymium magnet for improved output and transient response Superior off-axis rejection for maximum gain before feedback Corrosion-resistant contacts from gold-plated XLRM-type connector Rugged, all-metal design and construction for years of trouble-free use Specifications Operating Principle:..........Dynamic Polar Pattern:...............Hypercardioid Output Connection:...........Integral 3 pin XLRM type Frequency Response:..........40-15000 Hz Impedance:...................600 ohms Dimensions:..................127.5 mm (5.02") long, 55.0 mm (2.17") diameter Weight:......................252 g (8.9 oz) Sensitivity:.................-54 db (1.9 mv) re 1v at 1 pa Audio-Technica case style:........R9 * ATM450 Features Unique side-address stick design maximizes placement options with minimal obstructions Uncompromising sound quality for overheads, percussion, acoustic guitar, strings and other acoustic instruments Integral 80 Hz HPF switch and 10 dB pad Durable performance for professional applications Cardioid polar pattern reduces pickup of sounds from the sides and rear, improving isolation of desired sound source Rugged, all-metal design and construction for years of trouble-free use Includes isolation clamp for shock protection, secure mounting and easy positioning Specifications Operating Principle:..........Fixed-charge back plate permanently polarized condenser Polar Pattern:...............Cardioid Output Connection:...........Integral 3-pin XLRM-type Frequency Response:..........40-20,000 Hz Phantom Power Requirements:... 11-52V DC, 3.5 mA typical Impedance:...................200 ohms Dimensions:..................126.9 mm (5.00") long, 21.0 mm (0.83") diameter Weight:......................98 g (3.5 oz) Sensitivity:.................-41 dB (8.9 mV) re 1V at 1 Pa Low Frequency Roll-Off:.......80 Hz, 18 dB/octave Maximum Input Sound Level:.......152 dB SPL, 1 kHz at 1% T.H.D. Dynamic Range (TYPICAL) :........127 dB, 1 kHz at Max SPL Signal-To-Noise Ratio:.........69 dB, 1 kHz at 1 Pa Switch:.......Flat, roll-off 10 dB pad Audio-Technica case style: S11