Outputs
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IMPEDANCE |
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Designed for |
Actual |
Output |
OUTPUT |
Use With |
(Internal) |
Clipping Level |
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Low Imp |
Any low imp |
120 |
±22 dB |
Mic |
(19 to 600 ) |
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(100 mV) |
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mic circuit |
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High Imp |
Unbal 10 to |
5 k |
+4.5 dBV |
Mic |
50 k mic |
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(1.7 V) |
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circuit |
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Aux |
10 k or |
2.5 k |
18 dBV |
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greater |
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(7.9 V) |
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unbalanced |
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high-level cir- |
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cuits |
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Mix Bus |
3.3 k |
3.3 k |
±8 dBV |
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(0.4 V) |
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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 - 20-20,000 Hz) at full gain
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 series resistance
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
Operating: ±18o to 57o C (0o to 135o F)
Storage: ±29o to 74oC (±20o to 165o F)
Dimensions
See Figure 1.
309 mm |
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229 mm |
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(12 |
5/ in.) |
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(9 in.) |
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32 |
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68.8mm |
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(2 23/ |
32 |
in.) |
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6.3 mm |
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(1/ in. ) |
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4 |
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FIGURE 1 |
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Weight |
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Net: |
1.8 kg (4 lb 1 oz) |
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Packaged: 2.8 kg (6 lb 1 oz) |
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Certifications |
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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 lowand four high-impedance dynamic, ribbon or condenser microphones can be connected to receptacles 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 lowand high-impedance microphones can be used simultaneously. Crystal or ceramic microphones are not recommended. The input receptacles are professional three-pin XLR Audio-type connectors, and 1/4 phone jacks. See Figure 2 for lowand 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 eliminate the need for in-line attenuators to compensate for these ªhotº microphones.
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SHIELD |
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SHIELD |
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2 |
1 |
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3 |
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MICROPHONE |
MIXER INPUT |
MICROPHONE |
MIXER INPUT |
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LOW IMPEDANCE |
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HIGH IMPEDANCE |
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(BALANCED LINE) |
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MICROPHONE INPUT CONNECTIONS |
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SHIELD |
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SHIELD |
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1 |
2 |
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3 |
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LOW IMPEDANCE OUTPUT |
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HIGH IMPEDANCE OUTPUT |
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(BALANCED LINE) |
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MICROPHONE OUTPUT PLUG CONNECTIONS
FIGURE 2
2