McIntosh MI128 8-Channel Power Amplifier

120 Wpc into 8 ohms, 150 Wpc into 4 ohms, with digital inputs, bussing, and individual channel level controls

The McIntosh MI128 is a versatile 8-channel amplifier for distributed audio, home theater, and stereo applications. It delivers 120 W per channel into 8 ohms or 150 W per channel into 4 ohms using closed-loop digital switching amplifiers.

Its compact 2U chassis can be rack mounted using the included removable mounting ears or used as a conventional standalone component. The highly efficient class D design requires no cooling fans during normal operation, making it well suited to multizone installations and equipment racks.

Each channel has an individual unbalanced analog input, volume control, and 2-pole Phoenix-style push-in speaker terminal. Two digital audio inputs accept either coaxial or optical signals and can be bussed across channels, while channel-summing circuitry simplifies mono signal distribution.

Features

• 120 W per channel into 8 ohms
• 150 W per channel into 4 ohms
• Closed-loop digital switching amplifier design
• Individual unbalanced analog inputs
• Coaxial and optical digital audio inputs
• BUS inputs and outputs
• Channel-summing circuitry
• Individual channel volume controls
• Power Guard® signal overload protection
• Sentry Monitor™ short-circuit protection
• Power Control 12 V triggering
• Automatic on/off signal sensing
• Fanless operation
• 2U rack mounting with removable ears

Specifications

Power Output: 120 W per channel into 8 ohms; 150 W per channel into 4 ohms

Number of Channels: 8

Total Harmonic Distortion: 0.05%

Signal-to-Noise Ratio: 95 dB below rated output

Dynamic Headroom: 2.1 dB into 8 ohms; 3.3 dB into 4 ohms

Damping Factor: >65 into 8 ohms; >32 into 4 ohms

Rated Power Band: 20 Hz–20 kHz

Frequency Response: +0, -0.5 dB from 20 Hz–20 kHz

Circuit Configuration: Closed-loop digital switching

Output Type: Direct coupled

Speaker Connections: 2-pole Phoenix-style push-in terminals

Dimensions (H × W × D): 4-5/16" × 17-1/2" × 21" (110 × 445 × 533 mm)

Weight: 22 lb. (10 kg)