18
Specifications
Specifications
Power Output (All Seven Channels)
Minimum sine wave continuous average power output
per channel, all channels operating is:
200 watts into a 4 ohm or 8 ohm load
Power Output (Three Front Channels)
Minimum sine wave continuous average power output
per channel operating is:
250 watts into a 4 ohm or 8 ohm load
Output Load Impedance
8 and 4 ohms
Rated Power Band
20Hz to 20,000Hz
Total Harmonic Distortion
0.005% maximum harmonic distortion at any power
level from 250 milliwatts to rated power, 20Hz to
20,000Hz
Dynamic Headroom
3.3dB
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Input Sensitivity (for rated output)
2.2 Volt Balanced with a 4 ohm Loudspeaker
1.1 Volt Unbalanced with a 4 ohm Loudspeaker
3.0 Volt Balanced with an 8 ohm Loudspeaker
1.6 Volt Unbalanced with an 8 ohm Loudspeaker
Signal To Noise Ratio (A-Weighted)
108dB below rated output
Intermodulation Distortion
0.005% maximum, if the instantaneous peak power
output does not exceed twice the rated power output
or less per channel with all channels operating for any
combination of frequencies from 20Hz to 20,000Hz
Wide Band Damping Factor
Greater than 70 at 4 ohms
Greater than 140 at 8 ohms
Input Impedance
20,000 ohms Balanced
10,000 ohms Unbalanced
Voltage Gain
29dB
Power Guard
Less than 2% THD with up to 14dB overdrive at
1,000Hz
Power Control Inputs ZA and ZB
5-15VDC, less than 1mA
Power Control Output ZA and ZB
12VDC, 50mA maximum total
Output is delayed 0.2 seconds from turn On
Power Requirements
Field AC Voltage conversion of the MC257 is not
possible. The MC257 is factory configured for one of
the following AC Voltages:
100 Volts, 50/60Hz at 14.4 Amps
110 Volts, 50/60Hz at 13.0 Amps
120 Volts, 50/60Hz at 12.0 Amps
127 Volts, 50/60Hz at 12.0 Amps
220 Volts, 50/60Hz at 7.5 Amps
230 Volts, 50/60Hz at 6.5 Amps
240 Volts, 50/60Hz at 6.5 Amps
Standby: less than 0.5 watt
Note: Refer to the rear panel of the MC257 for the cor-
rect voltage.
Overall Dimensions
Width is 17-1/2 inches (44.5cm)
Height is 9-7/16 inches (23.9cm) including feet
Depth is 21 inches (53.3cm) including the Front Panel
and Cables
Weight
95 pounds (43 kg) net, 128 pounds (58 kg) in shipping
carton
Shipping Carton Dimensions
Width is 29-1/2 inches (74.9cm)
Height is 17 inches (43.2cm)
Depth is 29 inches (73.7cm)
