McIntosh MC257 7 Channel Power Amplifier


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Model: MC257 UPC: 842548109186 Item: 173717

Product Information

Bring your home theater dreams to life with the MC257 7-Channel Power Amplifier. Experience the latest blockbusters along with your favorite movies like never before in your home theater with the sound quality and power only McIntosh can deliver.

TripleView Power Output Meter

The MC257 is highlighted by the new eye-catching TripleView Power Output Meter that independently indicates the real time power reading of the amplifier’s three front channels. The easy-to-read, 15” (38 cm) wide TripleView meter design is a streamlined approach to the three individual meters found on our previous generation 7-channel home theater amplifier. Instead of three separate meter windows each housing a single meter, the TripleView features three of our traditional mechanical meters in a single meter enclosure. While a totally new design, each of the three pointers in the TripleView meter have the same inviting motion that McIntosh meters are known for and perform at the same high level as any of our meters. The captivating look and glow of the TripleView meter is sure to be a conversation starter, but its trademarked blue lighting can be turned off so as not to compete with your TV or movie screen.

Packs a Bigger Punch

When using just the front left, center and right channels, power output has been increased by 25% from 200 Watts per channel to 250 Watts per channel. When using all 7 channels, each will receive a healthy 200 Watts per channel. Regardless of how many channels are used, the full 200 or 250 Watts is delivered to either 4 or 8 Ohm speakers via Dynamic Power Manager® (DPM) technology. Filter capacity has been increased by 20% which has produced an amazing 94% increase in dynamic headroom from 1.7dB to 3.3dB as well as improving low frequency performance – both key features in a home theater amplifier, especially when listening to an energetic soundtrack.

Stealthy Operation

The MC257 comes with five McIntosh Monogrammed Heatsinks which are connected to advanced high current output transistors to efficiently and silently cool the amplifier; as a result, noisy cooling fans that can interfere with the movie soundtrack are not needed. A quiet, specially wound toroidal isolation power transformer also helps keep noise to a minimum. Speaker terminals have been updated to the standard gold-plated binding posts that prevent corrosion and ensure a quality signal is sent to your home theater speakers. A power management system that will turn the amplifier off after a set amount of time when no input signal has been detected has also been added. Finally, the front panel is now lit by direct LED backlighting for improved color accuracy and durability.

Loaded with All the Features That Make a McIntosh

The MC257 comes with steadfast McIntosh technologies like Power Guard® to prevent potential speaker damage caused by clipping and over-driving of the amplifier. Sentry Monitor technology protects against short-circuits by disengaging the output stage should the current ever exceed safe operating levels (it then resets automatically when operating conditions return to normal). Both balanced and unbalanced inputs are included to connect the MC257 home theater amplifier to your home theater processor.



  • Power Output: 200 watts per channel continuous (7 channels driven, 4 ohm or 8 ohm load)
  • Power Output (Three Front Channels only): 250 watts per channel continuous (3 channels driven, 4 ohm or 8 ohm load)
  • Output Load Impedance: 8 and 4 ohms
  • Rated Power Band: 20Hz-20kHz
  • Total Harmonic Distortion: 0.005% maximum harmonic distortion at any power level (250mW-rated power, 20Hz-20kHz)
  • 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
  • Dimensions (WxHxD): 17-1/2" x 9-7/16" x 21"
  • Weight: 95 pounds (43 kg) net, 128 pounds (58 kg) in shipping carton

What's in the Box

What's in the Box

  • MC257 Amplifier
  • Power cord


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