McIntosh MC451  1-Channel Dual Mono Amplifier
McIntosh MC451  1-Channel Dual Mono Amplifier McIntosh MC451  1-Channel Dual Mono Amplifier McIntosh MC451  1-Channel Dual Mono Amplifier McIntosh MC451  1-Channel Dual Mono Amplifier

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The McIntosh MC451 1-Channel Dual Mono Amplifier offers transformative bi-amping capabilities with its Hybrid Drive™ technology, combining vacuum tube and solid state amplifiers in one chassis for unparalleled sound performance. Its compact size allows for easy integration into any home audio system, enhancing your speakers' potential. Elevate your listening experience with the MC451.

  • Sentry Monitor - McIntosh designed and patented circuit that activates in case of accidental “shorts" in speaker wires. Fuse-less short-circuit protection circuit disengages the output stage before current exceeds safe operating level-resets automatically.
  • Power Guard® that monitors and adjusts the input signal in the 300 Watt solid state amplifier section in real time, then makes inconspicuous volume adjustments to prevent harsh sounding distortion and potential speaker damaging clipping.
  • Power Guard Screen Grid Sensor® (SGS). The 150 Watt vacuum tube amplifier section features our Power Guard SGS® technology. Power Guard SGS helps prevent premature vacuum tube failure by monitoring the screen grid current in the KT88 output vacuum tubes. If the current becomes too high, a circuit in Power Guard SGS is activated which then dynamically attenuates the input signal in real time to keep the vacuum tubes operating at safe levels.
  • Monogrammed Heatsink
Output Per Channel
  • Solid State Section: 300W
  • Vacuum Tube Section: 150W
Number of Channels 1
Speaker Impedance 2 or 4 or 8 Ohms
Rated Power Band 20Hz - 20kHz
Total Harmonic Distortion
  • Solid State Section: 0.005% maximum harmonic distortion  at any power level from 250 milliwatts to rated power, 20Hz - 20kHz
  • Vacuum Tube Section: 0.5% maximum harmonic distortion at any power level from 250 milliwatts to rated power, 20Hz - 20kHz
Dynamic Headroom
  • Solid State Section: 2.5dB
  • Vacuum Tube Section: 1.2dB
Frequency Response
  • Solid State Section:
    • +0, -0.25dB from 20Hz to 20kHz
    • +0, -3.0dB from 10Hz to 100kHz
  • Vacuum Tube Section:
    • +0, -0.5dB from 20Hz to 20kHz
    • +0, -3.0dB from 10Hz to 70kHz
Damping Factor
  • Solid State Section: >40
  • Vacuum Tube Section: >18
Dimensions (WxHxD) 17 7/8" (45.4cm) x 11 13/16" (30cm) x 21 1/2" (54.6cm)
Weight 133lbs (60.3kg)