Mcintosh MI254 4-Channel Digital Amplifier

The MI254 4-Channel Digital Amplifier is a versatile multi-channel amplifier ideal for use in distributed audio, home theater or 2-channel stereo playback. It delivers 250 Watts into 8 Ohm speakers or 300 Watts into 4 Ohm speakers via its highly sophisticated closed loop digital switching amplifiers. These amplifiers are paired with extremely robust power supplies that produce performance levels 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. In addition to distributed audio use, the MI254 is well suited for home theaters to drive surround sound speakers and could be integrated into virtually any existing home theater system.

On the front panel are two blue McIntosh Watt Meters that display the summed power output of channels 1 + 2 and channels 3 + 4. Multi-color LED indicators display the status of each channel. The back panel includes both a balanced and unbalanced input for each channel along with our standard 5-way speaker binding posts.

ELECTRONIC SPECIFICATIONS

• Power Output per Channel

  250 Watts into 8 Ohms
  300 Watts into 4 Ohms

• Number of Channels

  4

• Total Harmonic Distortion

  0.025%

• S/N below rated output

  100dB

• Dynamic Headroom

  8 Ohms: 2.5dB
  4 Ohms: 3.5dB

• Damping Factor

  8 Ohms: >85
  4 Ohms: >45

• Rated Power Band

  20Hz to 20kHz

• Frequency Response

  +0, -0.9dB from 20Hz to 20,000Hz

CONTROL

• Remote Power Control

  Yes

• Multi-Channel DB25 Cable

  N/A

CONNECTIVITY

• Speaker Binding Post Type

  Standard

GENERAL SPECIFICATIONS

• Circuit Configuration

  Closed loop digital switching

• Circuit Design

  Digital

• Mono Bridge

  N/A

• Mono Parallel

  N/A

• Output Type

  Direct Coupled

• Meters

  Yes

• Meter Light Switch

  No

• Balanced Input

  4

• Front Panel

  Glass with removable rack mounting ears

• Illumination

  Direct LED

• Chassis Style

  Black painted steel

WEIGHTS & DIMENSIONS

• 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

  23.5 lbs (10.7 kg)

• Shipping Weight

  40 lbs (18.1 kg)