McIntosh MI254 4-Channel Digital Power Amplifier
The McIntosh MI254 is a powerful and flexible 4-channel amplifier designed for premium home theater, distributed audio and custom-installed stereo systems. Its closed-loop Class D amplification delivers 250 watts per channel into 8 ohms or 300 watts per channel into 4 ohms, providing substantial output from a compact, fanless 2U chassis.
With four balanced and four unbalanced inputs, bussable stereo connections, standard 5-way speaker binding posts and removable rack ears, the MI254 can power surround or height speakers, two stereo zones, or other demanding four-channel applications while integrating cleanly into a centralized equipment rack.
Four High-Power Amplifier Channels
Each of the MI254’s four channels is rated at 250 watts into an 8-ohm loudspeaker or 300 watts into a 4-ohm loudspeaker. Unlike lower-powered multi-zone amplifiers, the MI254 is built for systems that need both flexible channel allocation and meaningful output capability.
In a home theater, it can drive four surround, rear or overhead channels from a compatible processor such as the McIntosh MX200 A/V Processor. It can also supplement the McIntosh MC257 7-Channel Amplifier when a larger immersive-audio system requires additional channels.
Efficient Closed-Loop Class D Design
The MI254 uses sophisticated closed-loop digital switching amplification paired with robust power supplies. Its efficient Class D design produces less heat than a traditional multi-channel amplifier and does not require cooling fans, helping it remain quiet in listening rooms, media closets and equipment racks.
Balanced, Unbalanced and Bussable Inputs
Each channel includes both a balanced XLR input and an unbalanced RCA input, allowing the MI254 to work with a wide range of preamplifiers, A/V processors and distributed-audio systems. Stereo BUS inputs and outputs can distribute the same left and right signals to multiple channels or pass those signals to another compatible amplifier.
Individual channel inputs make it possible to feed four independent signals when the system requires discrete amplification. Twelve-volt triggering and automatic signal sensing provide additional control options for custom installations.
McIntosh Watt Meters and Channel Indicators
Two blue McIntosh Watt Meters display the combined output of channels 1 and 2 and channels 3 and 4. Multi-color front-panel LEDs indicate the operating status of each amplifier channel, while the black glass faceplate, illuminated green McIntosh logo and silver trim preserve the company’s familiar appearance.
Power Guard and Sentry Monitor Protection
- Power Guard®: Monitors the output signal and helps prevent harsh clipping that could damage connected loudspeakers.
- Sentry Monitor™: Protects the output stage from short circuits and unsafe current levels, then automatically resets when normal conditions return.
- Signal sensing: Can automatically turn the amplifier on when an audio signal is detected and place it into standby after an extended period without a signal.
Compact 2U Rack-Mount Chassis
The MI254 is only 2U high and includes removable rack-mounting ears. It can be installed in a standard 19-inch equipment rack or used as a conventional component with the ears removed. Standard 5-way speaker binding posts support common banana-plug, spade and bare-wire connections.
MI254 in a Home Theater System
The MI254 is especially useful when a home theater processor provides more channels than the primary amplifier or receiver can power. It can add four channels for surround, rear-surround or Dolby Atmos height speakers while keeping the main channels on a larger amplifier. The McIntosh MHT300 Home Theater Receiver can also use external amplification when a system expands beyond its internal amplifier channels.
MI254 vs. Other Multi-Channel Amplifiers
The MI254 prioritizes higher output across four channels. It is a strong fit for installations that need fewer channels with more power per speaker. An eight-channel amplifier is generally better suited to a larger number of lower-demand distributed-audio zones, while a seven-channel theater amplifier may be preferable when most of the surround system must be powered from a single chassis.
McIntosh MI254 Specifications
| Amplifier Type | 4-channel digital Class D power amplifier |
|---|---|
| Power Output per Channel | 250 watts into 8 ohms; 300 watts into 4 ohms |
| Number of Channels | 4 |
| Total Harmonic Distortion | 0.025% |
| Signal-to-Noise Ratio | 100dB below rated output |
| Dynamic Headroom | 2.5dB at 8 ohms; 3.5dB at 4 ohms |
| Damping Factor | Greater than 85 at 8 ohms; greater than 45 at 4 ohms |
| Rated Power Band | 20Hz to 20kHz |
| Frequency Response | +0/-0.9dB from 20Hz to 20kHz |
| Circuit Configuration | Closed-loop digital switching |
| Output Type | Direct coupled |
| Balanced Inputs | 4 XLR |
| Unbalanced Inputs | 4 RCA plus stereo BUS input and output |
| Speaker Connections | Standard 5-way binding posts |
| Power Control | 12-volt trigger and automatic signal sensing |
| Protection | Power Guard® and Sentry Monitor™ |
| Meters | Two blue Watt Meters displaying summed output for channels 1 + 2 and 3 + 4 |
| Cooling | Fanless |
| Rack Mounting | 2U with removable rack ears |
| BTU Rating | 1,000 BTU per hour |
| Dimensions | 17-1/2 inches W without ears / 19 inches W with ears x 4-5/16 inches H x 21 inches D |
| Unit Weight | 23.5 lbs |
| Shipping Weight | 40 lbs |
| Warranty | 3-year limited warranty |
Frequently Asked Questions
Can the McIntosh MI254 be used for Dolby Atmos speakers?
Yes. The four channels can power height, surround or rear-surround speakers when connected to a compatible A/V processor with the required preamplifier outputs.
Can the MI254 power two stereo zones?
Yes. Its four channels can be arranged as two stereo pairs. The stereo BUS connections make it especially convenient when both pairs will receive the same source signal.
Does the MI254 have balanced XLR inputs?
Yes. Each of the four channels has a balanced XLR input and an unbalanced RCA input.
Can the MI254 be bridged for more power?
No bridge or parallel operating mode is specified. Each channel should be used independently at its rated output.
Does the MI254 require a cooling fan?
No. Its efficient Class D design is fanless, helping it operate quietly in a listening room or equipment rack.
Are rack ears included?
Yes. The removable rack ears allow installation in a standard 19-inch rack and can be removed for conventional shelf placement.
Authorized McIntosh Dealer Support
Audio Exchange is an authorized McIntosh dealer in Richmond, Virginia. Our team can help determine amplifier-channel requirements, speaker compatibility, processor integration and rack-planning needs for home theater and distributed-audio installations. Explore more options in our McIntosh Power Amplifiers and McIntosh Home Theater collections.
