Eligible for online purchase?

3 Year Limited Warranty

Add to WishlistRemove From Wishlist

Print this page

COMPARE

Ask an Expert

MI128 8-Channel Digital Amplifier

3 Year Limited Warranty

Print this page

COMPARE

Ask an Expert

Add to WishlistRemove From Wishlist

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.

Specifications
Electronic Specifications
- FTC Power Output Rating
  
  120 W
- 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)

Downloads

Product Literature	User Documents
MI128 Power Amplifier Brochure (1.13 MB)	MI128 Power Amplifier Owner's Manual (3.86 MB) MI128 Power Amplifier Connection Diagram (1.57 MB)

More from Power Amplifiers

MC2.1KW 1-Channel Solid State Amplifier
- Comes standard as 75th Anniversary Edition until May 31, 2025 (limited to 75 pairs per country)
- 2,000 Watt Quad Balanced Monoblock
- Tri-chassis design: 2 Power Modules, 1 Output Module
- Dual sets of balanced and unbalanced inputs
- Autoformer^™, Power Guard^®, Sentry Monitor^™, Monogrammed Heatsinks^™, Solid Cinch^™ speaker binding posts
- Multiple speaker terminals for bi- and tri-wiring
MC901 1-Channel Dual Mono Amplifier
- Includes our Hybrid Drive^™ technology that uses the best of vacuum tubes and solid state to produce the best sound performance
- The ultimate solution for bi-amping loudspeakers: 300 Watt vacuum tube amplifier and 600 Watt solid state amplifier on one chassis
- Vacuum tube section powers mid and upper drivers
- Solid state section drives power hungry woofers
- DualView™ Power Output Meter
MC1.25KW 1-Channel Solid State Amplifier
- 1,200 Watt Quad Balanced Monoblock
- Redesigned from top to bottom
- Autoformer^™, Power Guard^®, Sentry Monitor^™, Monogrammed Heatsinks^™, Solid Cinch^™ speaker binding posts
MC611 1-Channel Solid State Amplifier
- 600 Watt Quad Balanced Monoblock
- 55% increase in Dynamic Headroom compared to previous model
- Autoformer^™, Power Guard^®, Sentry Monitor^™, Monogrammed Heatsinks^™, Solid Cinch^™ speaker binding posts
MC451 1-Channel Dual Mono Amplifier
- Includes our Hybrid Drive^™ technology that uses the best of vacuum tubes and solid state to produce the best sound performance
- Designed with bi-amping loudspeakers in mind
- 150 Watt vacuum tube amplifier and 300 Watt solid state amplifier on one chassis
- Vacuum tube section powers mid and upper drivers
- Solid state section drives power hungry woofers
- DualView™ Power Output Meter
MC3500 1-Channel Vacuum Tube Amplifier Mk II
- 350 Watt Monoblock
- Inspired by the original 1968-71 MC3500 – the Amplifier that Inspired a Generation
- Powered by eight EL509S high-power output vacuum tubes
- Power Guard Screen Grid Sensor™, Sentry Monitor, Solid Cinch speaker binding posts
- Machined aluminum front panel with a bead blast finish and gold anodizing
MC830 1-Channel Solid State Amplifier
- 300 Watts into 8 Ohms
- 480 Watts into 4 Ohms
- Power Guard, Sentry Monitor, Monogrammed Heatsinks, Solid Cinch speaker binding posts
MC2301 1-Channel Vacuum Tube Amplifier
- 300 Watt Quad Balanced Monoblock
- Vacuum tube powered
MC462 2-Channel Solid State Amplifier
- 450 Watts x 2 Channels
- 66% increase in Dynamic Headroom compared to previous model
- Quad Balanced Design with McIntosh Autoformers™
MC312 2-Channel Solid State Amplifier
- 300 Watts x 2 Channels
- 27% increase in Dynamic Headroom compared to previous model
- McIntosh Autoformers™
MC152 2-Channel Solid State Amplifier
- 150 Watts x 2 Channels
- Space saving 6" tall chassis
MC2152 70th Anniversary 2-Channel Vacuum Tube Amplifier
- 150 Watts x 2 Channels
- Unity Coupled Circuit Output Transformers
- (8) KT88, (4) 12AX7A and (4) 12AT7 vacuum tubes
- Striking new design with carbon fiber side panels
MC1502 2-Channel Vacuum Tube Amplifier
- 150 Watts x 2 Channels
- Unity Coupled Circuit Output Transformers
- (8) KT88, (4) 12AX7A and (4) 12AT7 vacuum tubes
MC275 2-Channel Vacuum Tube Amplifier
- 75 Watts x 2 channels or 150 Watts x 1 channel
- Unity Coupled Circuit Output Transformers
- (4) KT88, (4) 12AT7 and (3) 12AX7A vacuum tubes
- One of the most iconic amplifiers ever made by any brand
MC303 3-Channel Solid State Amplifier
- 300 Watts x 3 Channels
- Designed for home theaters
- Tri-Amp capability
MC255 5-Channel Solid State Amplifier
- 250 Watts x 3 Channels; 200 Watts x 5 Channels
- TripleView™ Power Output Meter
- More than 100% increase in Dynamic Headroom
- Dynamic Power Manager^®; Power Guard^®
- Designed for home theaters
MC257 7-Channel Solid State Amplifier
- 250 Watts x 3 Channels; 200 Watts x 7 Channels
- TripleView™ Power Output Meter
- 94% increase in Dynamic Headroom
- Dynamic Power Manager^®; Power Guard^®
- Designed for home theaters
MC8207 7-Channel Solid State Amplifier
- 200 Watts x 7 Channels
- Designed for home theaters
- LED power output indicators
MI502 2-Channel Digital Amplifier
- Versatile audio amplifier for custom install applications
- 500 Watts into 8 Ohms
- 800 Watts into 4 Ohms
- 2U rack mountable
- Signal sensing
- Power Guard^® and Sentry Monitor^™
MI254 4-Channel Digital Amplifier
- Perfect for home theater surround sound speakers
- 250 Watts into 8 Ohms
- 300 Watts into 4 Ohms
- 2U rack mountable
- Can also be used in distributed audio
- Bussable inputs
- Signal sensing
- Power Guard^® and Sentry Monitor^™
MI347 7-Channel Digital Amplifier
- Designed for home theaters
- 3 Front Channels: 250 Watts into 8 Ohms or 300 Watts into 4 Ohms
- 4 Surround Channels: 125 Watts into 8 Ohms or 200 Watts into 4 Ohms
- 3U rack mountable
- Power Guard^® and Sentry Monitor^™
MI1250 12-Channel Digital Amplifier
- Ideal for multi-zone distributed audio
- 50 Watts into 8 Ohms
- 90 Watts into 4 Ohms
- 2U rack mountable
- Channel summing circuits for mono signal distribution
- Volume controls for each channel
- Bussable inputs
- Signal sensing
- Power Guard^® and Sentry Monitor^™
MHA200 2-Channel Vacuum Tube Headphone Amplifier
- Compact footprint: just 6-1/8" (15.6cm) x 9-1/8" (23.2cm)
- 4 selectable headphone impedance ranges
- Balanced and unbalanced analog inputs
- Balanced stereo or dedicated Left & Right outputs
MHA200 2-Channel Vacuum Tube Headphone Amplifier 75th Anniversary Edition
ONLY AVAILABLE IN THE USA AND ONLY AT SHOP.MCINTOSHLABS.COM
- Special Edition MHA200 with 75th Anniversary logo
- Signed by McIntosh President Charlie Randall
- All the features and performance of the standard unit
- Compact footprint: just 6-1/8" (15.6cm) x 9-1/8" (23.2cm)
- 4 selectable headphone impedance ranges
- Balanced stereo or dedicated Left & Right outputs
MHA50 Portable Decoding Amplifier
- Smartphone sized headphone amplifier with DAC
- Digital inputs for iOS, Android and PC/Mac
- Bluetooth input
- Supports PCM to 192kHz, DSD128, aptX
MC2KW 1-Channel Solid State Amplifier
- 2,000 Watt Quad Balanced Monoblock
- 3 speaker terminals for tri-wiring
- 2 Power Modules, 1 Output Module