McIntosh 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

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.

Other features that come with the MI254 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 MI254 includes many McIntosh design cues including a black glass front panel, blue Watt meters, an illuminated McIntosh logo, and a familiar form factor highlighted by silver trim. Contact your local dealer to learn more about integrating the MI254 into your custom audio installation.

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

CONNECTIVITY

• Speaker Binding Post Type Standard

GENERAL SPECIFICATIONS

• Circuit Configuration Closed loop digital switching
  
• Circuit Design Digital
  
• Output Type Direct Coupled
  
• Meters Yes
  
• Balanced Input 4
  
• 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 23.5 lbs (10.7 kg)
  
• Shipping Weight 40 lbs (18.1 kg)