Shure M267 User Manual
Page 2
2
Outputs
IMPEDANCE
Output
Designed for
Use With
Actual
(Internal)
Output
Clipping Level
Microphone
Any low imped-
ance microphone
input
0.5
–34 dB
(20 mV)
Mix Bus
3.5 k
Ω
3.5 k
Ω
–8 dBV
(400 mV)
Head-
phones
8 - 2000
Ω
200
Ω
recommended
400
Ω
to
3 k
Ω∗∗
+10 dBV
(3.3 V)
Line
600
Ω
150
Ω
+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
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
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
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 k
Ω
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: –18
o
to 57
o
C (0
o
to 135
o
F)
Storage:
–29
o
to 71
o
C (–20
o
to 160
o
F)
Dimensions
See Figure 1
309 mm
(12
5
/
32
in.)
68.8mm
(2
23
/
32
in.)
6.3 mm
(
1
/
4
in. )
229 mm
(9 in.)
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