8-Channel Digital Amplifier

If you have a trade-in, request Trade-in Price.


Only available for in-store purchase.

Product Description

The McIntosh MI128 A/V Processor is eligible for Overture’s trade-in program for an in-store sale. As America’s premier McIntosh audio dealer, we can give you the most for any audio equipment you would like to trade-in on a McIntosh MI128 A/V Processor. You can request a trade-in price by filling out our trade-in form.

The versatile MI128 8-Channel Digital Amplifier can be used in many applications ranging from distributed audio to home theater to stereo listening. It delivers 120 Watts into 8 Ohm speakers or 150 Watts into 4 Ohm speakers via highly sophisticated closed loop digital switching amplifiers that are paired with extremely robust power supplies to produce performance levels that are rarely achieved in distributed audio.

It has installer-friendly physical dimensions and is 2U rack mountable via the included mounting ears (the mounting ears are removable for non-rack installations). As a highly efficient Class D amplifier, it does not require noisy cooling fans to maintain nominal operating temperature.

On the front panel, multi-color LED indicators display the status of each channel. On the back are unbalanced inputs for each channel plus 2-pole Phoenix style push-in speaker terminals. Also located on the back are volume controls for volume balancing, along with 2 digital audio inputs (either coax or optical) that can be bussed, and channel summing circuits for easy mono signal distribution.

Other features included on the MI128 are: Loudspeaker Guard signal overload technology that prevents overdriving the speakers; our Sentry Monitor™ short-circuit protection circuit that disengages the output stage before current exceeds safe operating levels and then resets automatically when operating conditions return to normal; BUS input & outputs to easily distribute a stereo signal to multiple outputs and/or multiple amplifiers; individual channel inputs; 12 Volt triggering capabilities; and eco-friendly on/off signal sensing that turns the unit off if no input signal has been detected for a set amount of time or automatically turns the amp on when it senses a signal.

The MI128 includes many McIntosh design cues including a black glass front panel housing an illuminated McIntosh logo, along with a familiar form factor that is highlighted with silver trim.


  • Power Output per Channel
    120 Watts into 8 Ohms
    150 Watts into 4 Ohms
  • Number of Channels
  • Total Harmonic Distortion
  • S/N below rated output
  • Dynamic Headroom
    8 Ohms: 2.1dB
    4 Ohms: 3.3dB
  • Damping Factor
    8 Ohms: >65
    4 Ohms: >32
  • Rated Power Band
    20Hz to 20kHz
  • Frequency Response
    +0, -0.5dB from 20Hz to 20,000Hz


  • Remote Power Control
  • Multi-Channel DB25 Cable


  • Speaker Binding Post Type
    2-pole Phoenix style push-in speaker terminals


  • Circuit Configuration
    Closed loop digital switching
  • Circuit Design
  • Mono Bridge
  • Mono Parallel
  • Output Type
    Direct Coupled
  • Meters
  • Meter Light Switch
  • Balanced Input
  • Front Panel
    Glass with removable rack mounting ears
  • Illumination
    Direct LED
  • Chassis Style
    Black painted steel
  • BTU Rating
    1000 BTU/h


  • Unit Dimensions (W x H x D)
    17-1/2″ (44.45cm) (19″ (48.3cm with mounting ears)) x 4-5/16″ (11cm) (including feet) x 21″ (53.3cm) (including front panel and cables)
  • Unit Weight
    22 lbs (10 kg)
  • Shipping Weight
    38.4 lbs (17.4 kg)



Viewed as the standard bearer by recording artists and producers, McIntosh has come to represent performance and reliability. All components include that iconic blue Watt output meter synonymous with high-end sound. Ready to unleash the magic behind some of the most iconic moments in music history including Woodstock and The Grateful Dead's Wall of Sound?

Get the best sound performance for 2-channel, theaters or distributed audio with McIntosh. Its handcrafted products include amplifiers, preamplifiers, phono preamplifiers, receivers and home theater processors. The company has offered its revered electronics since 1949 and expanded its range with speakers in the 1970s. And in recent years, it's added an even more intimate approach to high-end audio with its headphone amplifiers featuring built-in DACs.

Their various products make it easy to design systems that best match your listening preferences and budgets. However you like to listen or wherever your music lives, it's possible to listen just as the artist intended with the help of McIntosh components. Enjoy the purest sound reproduction with two-chassis preamplifier designs like the C12000 the perfect pair for your vinyl records. Take control of your digital sound to new heights with their DACs featuring Hybrid Drive solid state and vacuum tube technology.

As a nationally recognized leader in the field of high-end audio and home theater, Overture is a proud dealer of McIntosh audio components, selling customers the best audio components from McIntosh in Sales Tax Free Delaware. Interested in purchasing a new McIntosh product? You can trade-in any component towards a McIntosh component by filling out Overture's Trade-In Form.