Shure Brothers Incorporated 222 Hartrey Avenue Evanston IL 60202-3696 U.S.A. Phone: 800-257-4873 Fax: 847-866-2279 In Europe, Phone: 49-7131-72140 Fax: 49-7131-721414 Internationally, Phone: 847-866-2200 Fax: 847-866-2585 Web Address: http://www.shure.com MODEL M267 MICROPHONE MIXER Specification Sheet GENERAL The Shure Model M267 is a microphone mixer-remote amplifier specifically designed for professional applications. The excellent performance, versatility and features of this complete, compact console make it an ideal choice for studio, remote, or sound reinforcement use, and as an add-on mixer for expanding existing facilities. It is also ideally suited for use with audio and video tape recorders to provide multiple microphone inputs. Wide, flat frequency response and extremely low distortion up to +18 dBm output Extremely low noise and RF susceptibility Four switchable microphone- or line-level balanced-line inputs with individual gain controls and low-frequency rolloff switches. MUMETAL shielding on input transformers Feedback-type input gain controls for maximum clipping levels and dynamic range Output switchable for line or microphone level Built-in switchable peak limiter cuts output overload distortion, adapts to power supply voltage LED indicator shows limiter operation or overload with limiter defeated Externally adjustable limiter threshold (–4 to +18 dBm) VU meter calibrated for +4 and +8 dBm with range switch. Illuminated with ac operation Ac or built-in battery operation. Noiseless automatic switchover to battery in case of ac line failure. Battery test without program interruption Front-panel headphone level control and monitor jack drives almost any stereo or mono headphones; output can be additional unbalanced line feed to drive a tape recorder or power amplifier Direct mix bus for stacking units Automatic muting prevents speaker damage during turn-on and -off Low distortion, high-stability tone oscillator for line test and level checks FOD NO. 09055 1997, Shure Brothers Incorporated All connections phased. Line output terminals phase-indicated Compact and lightweight, with rugged, abrasion-resistant case Internally selectable 120 or 240 Vac, 50/60 Hz operation Underwriters’ Laboratories Listed and Canadian Standards Association listed as Certified SPECIFICATIONS Features: Frequency Response 30 Hz to 20,000 Hz, ±2 dB Voltage Gain (at 1,000 Hz) (Outputs terminated: line 600 microphone 150 mix bus 3.3 k headphone 200 , tip-sleeve and ring-sleeve ) OUTPUT Inp t Input Line Microphone Mix Bus 91 dB 41 dB 24 dB Line 40 dB –9 dB –27 dB Mix Bus 55 dB 5 dB –– Low-Impedance Microphone (150 ) Inputs IMPEDANCE Input Microphone Line Mix Bus Designed for Use With Actual (Internal) 19 to 600 1 k –32 dBV to –5 dBV∗ (25 mV to 0.56 V) Less than10 k 66 k +20 dBV 3.5 k 3.5 k +7 dBV (2.2 V) Input Clipping Level ∗Depending on input control setting Page 1 of 2 Printed in U.S.A. MODEL M267 MICROPHONE MIXER Outputs Peak Indicator Lights 6 dB below clipping or at onset of limiter action IMPEDANCE Designed for Use With Actual (Internal) Output Clipping Level Any low impedance microphone input 0.5 W –34 dB (20 mV) Mix Bus 3.5 kW 3.5 kW –8 dBV (400 mV) Headphones 8 - 2000 W 200 W recommended 400 W to 3 kW∗∗ +10 dBV (3.3 V) 600 W 150 W +18 dBm (6.2 V) Output Microphone Specification Sheet Line Headphone Output Clipping Level 3.16V (+10 dBV) into 200 W Tone Oscillator 1,000 Hz, 1.5% or less THD Phantom Power 30 Vdc open-circuit, 3.3 kW series resistance, input switches in MIC position only Operating Voltage Ac Operation: 120 or 240 volts ±10%, 50/60 Hz, 9.5W, internally switchable[ ∗∗Depending on level control setting Noise Dc Operation: 27 volts nominal at 15 mA typical no-signal, 18 mA typical at 0 VU (+4 dBm) output with headphone load; 21.5 volts minimum Equivalent Input Hum and Noise: –126 dBV (low impedance microphone, 150 W - 20-20,000 Hz) into a 600 W load at full gain Output Noise: –75 dBV (master control fully counterclockwise), –53 dBV (master fully clockwise), (input controls down, 300-20,000 Hz) Battery life: approximately 20 hours with alkaline batteries at +4 dBm output in continuous use; three 9-volt batteries, type NEDA 1604A (Duracell MN1604 recommended) Output Hum and Noise: –70 dBV (master control down), –51 dBV (master control up) (input controls down, 20-20,000 Hz) [ Supplied wired for 120 Vac operation (See Service section for 240 Vac operation) Distortion Temperature Range Operating: –18o to 57o C (0o to 135o F) Storage: –29o to 71oC (–20o to 160o F) 0.35% or less THD from 30 to 20,000 Hz at +15 dBm output; 0.5% or less IM distortion up to +15 dBm output level Dimensions Common Mode Rejection 65 dB minimum with input of –20 dBV at 100 Hz See Figure 1 Control Interaction 229 mm (9 in.) 309 mm (12 5/32 in.) Less than 1 dB with any control combination 68.8mm (2 23/32 in.) Overload and Shorting Protection Shorting the outputs, even for prolonged periods, will cause no damage; microphone inputs will not be damaged by signals up to 3 volts Lo-Cut Filters 6.3 mm (1/4 in. ) FIGURE 1 Weight 6 dB/octave rolloff at 150 Hz Net: Limiter Threshold: +15 dBm (line output level; adjustable from –4 to +18 dBm) Attack Time: Packaged: 3.2 kg (7 lb 2 oz) Certifications 3 msec typical Listed by Underwriters’ Laboratories, Inc., and listed by Canadian Standards Association as Certified Recovery Time: 500 msec typical FOD NO. 09055 E1997, Shure Brothers Incorporated 2.3 kg (5 lb 2 oz) Page 2 of 2 Printed in U.S.A.
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