Advertisement
Outputs
IMPEDANCE
Designed for
Use With
OUTPUT
Low Imp
Any low imp
Mic
(19 to 600
)
mic circuit
High Imp
Unbal 10 to
Mic
50 k
mic
circuit
Aux
10 k
or
greater
unbalanced
high-level cir-
cuits
Mix Bus
3.3 k
Noise
Equivalent Input Noise: –128 dBV (low impedance
mic 150
- 300-20,000 Hz) at full gain
Equivalent Input Hum and Noise: –125 dBV (low
impedance mic 150
Output Noise: –90 dBV (master control down). –65
dBV (master up), (input controls down, 300-20,000 Hz)
Output Hum and Noise: –82 dBV (master down), –60
dBV (master up) (input controls down, 20-20,000 Hz)
Common Mode Rejection
65 dB minimum with 100 mV input at 100 Hz
Control Interaction
Less than 1 dB with any control combination
Phase
All microphone inputs and outputs in phase; tips of
high-impedance inputs and mix bus jack in phase with
pin 3; aux input in phase with aux outputs and pin 2
Phantom Power
30 Vdc open circuit, 3.3 k
Operating Voltage
120 or 240 volts 10%, 50/60 Hz, 5W, supplied wired
for 120 Vac operation (see Service section for 240 Vac
operation)
Temperature Range
o
o
Operating: –18
to 57
o
o
Storage:
–29
to 74
Actual
Output
(Internal)
Clipping Level
120
–22 dB
(100 mV)
5 k
+4.5 dBV
(1.7 V)
2.5 k
18 dBV
(7.9 V)
3.3 k
–8 dBV
(0.4 V)
- 20-20,000 Hz) at full gain
series resistance
o
o
C (0
to 135
F)
o
o
C (–20
to 165
F)
Dimensions
See Figure 1.
309 mm
5
(12
/
in.)
32
Weight
Net:
1.8 kg (4 lb 1 oz)
Packaged: 2.8 kg (6 lb 1 oz)
Certifications
Listed by Underwriters' Laboratories, Inc., and listed
by Canadian Standards Association as Certified
CONTROLS AND CONNECTORS
WARNING
This apparatus must be earthed (grounded)! The
M268 power supply is energized when the unit is
connected to an ac source; disconnect mains
(power) plug from supply when not in use.
Inputs
A maximum of four low- and four high-impedance dynamic,
ribbon or condenser microphones can be connected to recep-
tacles marked INPUT 1, INPUT 2, INPUT 3, and INPUT 4.
The inputs are designed for low-impedance microphones with
19 to 600
impedance, or high-impedance microphones.
Both low- and high-impedance microphones can be used si-
multaneously. Crystal or ceramic microphones are not recom-
mended. The input receptacles are professional three-pin
XLR Audio-type connectors, and
ure 2 for low- and high-impedance connections to inputs.
Note that some condenser microphones produce very high
output signals which may overload the inputs of many mixers;
the M268's feedback-type active gain controls virtually elimi-
nate the need for in-line attenuators to compensate for these
"hot" microphones.
SHIELD
2
MICROPHONE
MIXER INPUT
LOW IMPEDANCE
(BALANCED LINE)
MICROPHONE INPUT CONNECTIONS
SHIELD
1
2
3
LOW IMPEDANCE OUTPUT
(BALANCED LINE)
MICROPHONE OUTPUT PLUG CONNECTIONS
2
229 mm
(9 in.)
68.8mm
23
(2
/
in.)
32
6.3 mm
1
(
/
in. )
4
FIGURE 1
1
/
phone jacks. See Fig-
4
SHIELD
1
3
MICROPHONE
MIXER INPUT
HIGH IMPEDANCE
SHIELD
HIGH IMPEDANCE OUTPUT
FIGURE 2
Advertisement
