Shure M267 Outputs, Distortion, Common Mode Rejection, Headphone Output Clipping Level, Limiter

Outputs

	IMPEDANCE
	Designed for	Actual	Output
Output	Use With	(Internal)	Clipping Level
Microphone	Any low imped-	0.5	±34 dB
	ance microphone		(20 mV)
	input
Mix Bus	3.5 kΩ	3.5 kΩ	±8 dBV
			(400 mV)
Head-	8 - 2000 Ω	400 Ω to	+10 dBV
phones	200 Ω	3 kΩ∗∗	(3.3 V)
	recommended
Line	600Ω	150Ω	+18 dBm
			(6.2 V)
∗∗Depending on level control setting
Noise

Equivalent Input Hum and Noise: ±126 dBV (low im- pedance microphone, 150 Ω - 20-20,000 Hz) into a 600 Ω load at full gain

Output Noise: ±75 dBV (master control fully counter- clockwise), ±53 dBV (master fully clockwise), (input con- trols down, 300-20,000 Hz)

Output Hum and Noise: ±70 dBV (master control down), ±51 dBV (master control up) (input controls down, 20-20,000 Hz)

Distortion

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

Common Mode Rejection

65 dB minimum with input of ±20 dBV at 100 Hz

Headphone Output Clipping Level

3.16V (+10 dBV) into 200 Ω

Tone Oscillator

1,000 Hz, 1.5% or less THD

Phantom Power

30 Vdc open-circuit, 3.3 kΩ series resistance, input switches in MIC position only

Operating Voltage

Ac Operation: 120 or 240 volts ±10%, 50/60 Hz, 9.5W, internally switchable[

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

Battery life: approximately 20 hours with alkaline bat- teries at +4 dBm output in continuous use; three 9-volt batteries, type NEDA 1604A (Duracell MN1604 rec- ommended)

[Supplied wired for 120 Vac operation (See Service section for 240 Vac operation)

Temperature Range

Operating: ±18o to 57o C (0o to 135o F)

Storage: ±29o to 71oC (±20o to 160o F)

Dimensions

Control Interaction

Less than 1 dB with any control combination

Overload and Shorting Protection

Shorting the outputs, even for prolonged periods, will cause no damage; microphone inputs will not be dam- aged by signals up to 3 volts

See Figure 1

309 mm

(12 5/32 in.)

229 mm

(9 in.)

68.8mm

(2 23/32 in.)

6.3 mm (1/4 in. )

Lo-Cut Filters

6 dB/octave rolloff at 150 Hz

Limiter

Threshold: +15 dBm (line output level; adjustable from ±4 to +18 dBm)

Attack Time: 3 msec typical

Recovery Time: 500 msec typical

Peak Indicator

Lights 6 dB below clipping or at onset of limiter action

FIGURE 1

Weight

Net: 2.3 kg (5 lb 2 oz)

Packaged: 3.2 kg (7 lb 2 oz)

Certifications

Listed by Underwriters' Laboratories, Inc., and listed by Canadian Standards Association as Certified

2