McIntosh Labs MC303 300 Watt Three Channel Power Amplifier

Model: MC303 UPC: 090120151974 Item: 145225

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Product Information

MC303  300 Watt Three Channel Power Amplifier

Premium cosmetics featuring a ½” 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.


MC303 Highlights:

  • Three 300 Watt Channels
  • 60 Amps Output Current
  • Large Gold Plated Five-Way Binding Poss


MC303 Features:

  • EXCLUSIVE MCINTOSH POWER ASSURANCE SYSTEM: A collection of technologies that enhance performance and reliability while protecting the amplifier and loudspeakers.
  • POWER GUARD: A waveform comparison circuit continuously monitors both input and output signals. Power Guard dynamically adjusts the input level to avoid clipping while preventing harsh sounding distortion.
  • SENTRY MONITOR: Fuse-less short-circuit protection circuit disengages the output stage before current exceeds safe operating level – resets automatically.
  • OUTPUT AUTOFORMER: Unique McIntosh technology delivers the full rated amplifier output with the least possible distortion into loudspeaker impedances of 2, 4, or 8 Ohms; you get all the power you paid for and the freedom to choose any loudspeaker.
  • WATTMETER: Swift, accurate response reveals program peaks so staying within the power limits of your loudspeakers is easy.


MC303 Specifications:


  • Power Output Per Channel: 300W @ 2, 4 or 8 ohms
  • Number of Channels: 3
  • Total Harmonic Distortion: 0.005%
  • S/N Below Rated Output: 112dB
  • Dynamic Headroom: 1.8dB
  • Damping Factor: >40
  • Rated Power Band: 20Hz to 20kHz
  • Frequency Response:
    • +0, -0.25dB from 20Hz to 20,000Hz
    • +0, -3dB from 10Hz to 100,000Hz


  • Remote Power Control: Yes


  • Circuit Configuration: Push-Pull Complementary Autoformers
  • Circuit Design: Transistor
  • Autoformer: Yes
  • Meters: Yes
  • Meter Light Switch: Yes
  • Balanced Input: Yes
  • Front Panel: Glass with handles
  • Illumination: LED Fiber Optic
  • Chassis Style: Inverted
  • Gold Plated Binding Posts: Yes

Weights & Dimensions

  • Dimensions (W x H x D): 17-3/4" (45.09cm) x 12-3/8" (31.43cm) (including feet) x 22" (55.88cm) (including front panel and cables)
  • Weight: 155lbs (70.3kg)

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