McIntosh MI128 Digital Amplifier

The versatile MI128 8-Channel Digital Amplifier can be used in many applications, ranging from distributed audio to home theater to stereo listening.




The MI128 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.

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.

Contact us today to learn more about integrating the MI128 into your custom audio installation!



  • Loudspeaker Guard signal overload technology that prevents overdriving the speakers
  • 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
  • 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.




  • Power Output per Channel: 120 Watts into 8 Ohms; 150 Watts into 4 Ohms
  • Number of Channels: 8
  • Total Harmonic Distortion: 0.05%
  • S/N below rated output: 95dB
  • 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: Yes
  • Multi-Channel DB25 Cable: N/A
  • Speaker Binding Post Type: 2-pole Phoenix style push-in speaker terminals
  • Circuit Configuration: Closed loop digital switching
  • Circuit Design: Digital
  • Mono Bridge: N/A
  • Mono Parallel: N/A
  • Output Type: Direct Coupled
  • Meters: No
  • Meter Light Switch: No
  • Balanced Input: 0
  • Front Panel: Glass with removable rack mounting ears
  • Illumination: Direct LED
  • Chassis Style: Black painted steel
  • 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)
  • Weight: 22 lbs (10 kg); Shipping Weight 38.4 lbs (17.4 kg)


In stock! Usually ships within 24 hours.
Availability: This product is available for purchase in-store only. Contact us for more information.