McIntosh MI128, 8-channel power amplifier

The McIntosh MI128 is a flexible and advanced 8-channel digital amplifier designed for a variety of audio systems - from multi-zone audio distribution to home theater or stereo listening. This device delivers exceptional sound quality and reliability, featuring a compact design, efficient Class D architecture and power output of up to 150W into 4 ohms.

Power: 120 W into 8 Ω; 150 W into 4 Ω (per channel)
Number of channels: 8
Frequency range: +0, -0.5 dB from 20 Hz to 20 kHz
Signal-to-noise ratio (at rated power): 95 dB
Damping factor: 8 ohms: >65; 4 ohms: >32

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: Power 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. Contact your local dealer to learn more about integrating the MI128 into your custom audio installation.

Electronic Specifications

• FTC Power Output Rating

  120W

• Power Output per Channel

  120 W into 8 ohms
  150 W 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 20kHz

Control

• Remote Power Control

  Yes

• Multi-Channel DB25 Cable

  N/A

Connectivity

• Speaker Binding Post Type

  2-pole Phoenix style push-in speaker terminals

General Specifications

• 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

• BTU Rating

  1000 BTU/h

Weights & Dimensions

• 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)

User manual (EN)