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McIntosh MC303

Three Channel Power Amplifier
This product is available in store only.
Have questions or wish to purchase? Inquire here »

This product is available in-store only.
Have questions or wish to purchase? Inquire here »

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McIntosh MC303 Details

McIntosh MC303 Three Channel Power AmplifierEnjoy truly extraordinary

At 300 watts per channel the new McIntosh MC303 Three Channel Power Amplifier with Autoformers delivers its maximum rated output power into 2, 4, or 8 ohm loads for the lowest noise and distortion performance possible. Premium cosmetics featuring a thick glass faceplate, custom machined and anodized aluminum handles, and a mirror polished stainless steel chassis are standard equipment on the MC303.

Power Guard, a McIntosh circuit innovation, maximizes sound quality at high power levels while our Sentry Monitor feature provides continuous short circuit protection of the amplifier and connected loudspeakers. A triple bank of Peak Reading Watt Meters provides instant recognition of power output and may be switched off for theater use.

In order to insure the highest level of customer satisfaction, New McIntosh Products may only be purchased over-the-counter at an Authorized McIntosh Dealer, and may not be sold by mail, telephone, or via the Internet. McINTOSH PRODUCTS WHICH ARE PURCHASED BY MAIL, TELEPHONE, OR OVER THE INTERNET, ARE PRESUMED TO BE USED AND ARE NOT COVERED BY ANY McINTOSH WARRANTY. If you are unable to visit our store in person, please telephone McIntosh at (888) 979-3737 to learn the name and location of a nearby Authorized McIntosh Dealer, or visit the McIntosh website at


ListenUp has the only factory-authorized McIntosh service center in the Denver metro area.

Additional Information

Name McIntosh MC303
Sub Title Three Channel Power Amplifier
Manufacturer McIntosh
Manufacturer Part# MC303

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Power Output
Minimum sine wave continuous average power output per channel, all channels operating: 300 watts into a 2 ohm, 4 ohm or 8 ohm load

Output Load Impedance: 2, 4 or 8 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: 1.8dB

Frequency Response:
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz

Input Sensitivity (for rated output):
1.7 Volt Unbalanced
3.4 Volt Balanced

Signal To Noise Ratio (A-Weighted): 112dB below rated output

Intermodulation Distortion:
0.005% maximum, if the instantaneous peak power output does not exceed twice the rated power output for any combination of frequencies from 20Hz to 20,000Hz.

Wide Band Damping Factor: Greater than 40

Input Impedance: 10,000 ohms

Power Guard: Less than 2% THD with up to 14dB overdrive at 1,000Hz

Power Control Input: 5VDC - 12VDC

Power Control Output: 12VDC, 25mA maximum, delay 0.2 seconds

Power Requirements:
100 Volts, 50/60Hz at 12 Amps
110 Volts, 50/60Hz at 11 Amps
120 Volts, 50/60Hz at 10 Amps
220 Volts, 50/60Hz at 6 Amps
230 Volts, 50/60Hz at 6 Amps
240 Volts, 50/60Hz at 6 Amps
Standby: Less than 1 watt

Note: Refer to the rear panel of the MC303 for the correct voltage.

Overall Dimensions:
Width is 17-3/4 inches (45.09cm)
Height is 12-3/8 inches (31.43cm) including feet
Depth is 22 inches (55.88cm) including the Front Panel and Cables

155 pounds (70.3 kg) net, 180 pounds (81.6 kg) in shipping carton

Shipping Carton Dimensions
Width is 31 inches (78.74cm)
Depth is 28 inches (71.12cm)
Height is 17-1/4 inches (43.82cm)