McIntosh MC1.25KW 1,200-Watt Monoblock Power Amplifier
The McIntosh MC1.25KW is a reference-level, one-channel solid state amplifier built for demanding two-channel music systems and high-performance home theaters. It delivers 1,200 watts into 2, 4 or 8 ohms through McIntosh Autoformer™ technology, allowing the amplifier to provide its full rated output across a wide range of loudspeakers.
The MC1.25KW is sold individually. Two amplifiers are required for a stereo pair. Its Quad Balanced architecture, extremely low 0.005% total harmonic distortion and 124dB balanced signal-to-noise ratio make it suitable for systems where effortless dynamics, low noise and precise loudspeaker control are essential.
Why Choose the McIntosh MC1.25KW?
- 1,200 watts into 2, 4 or 8 ohms: McIntosh Autoformer technology delivers the amplifier’s full rated power to a broad range of speaker impedances.
- Quad Balanced circuit design: Two complete amplifier sections operate in a balanced configuration to help cancel noise and distortion.
- High-current loudspeaker control: Four Monogrammed Heatsinks™ connect to advanced output transistors for stable thermal performance and authoritative control.
- Power Guard®: Continuously monitors the output signal and helps prevent clipping that could create harsh sound or damage loudspeakers.
- Sentry Monitor™: Fuse-free short-circuit protection disengages the output stage when operating limits are exceeded and automatically resets when conditions return to normal.
- 11-inch blue Watt meter: The large, fast-responding meter displays real-time power output and uses direct LED backlighting.
- Balanced and unbalanced connectivity: Includes both input types plus corresponding outputs for bi-amping, tri-amping, powered subwoofers or secondary systems.
- Solid Cinch™ speaker terminals: Gold-plated binding posts provide a secure connection for heavy speaker cables.
Built for Reference Two-Channel and Theater Systems
A pair of MC1.25KW monoblock amplifiers can anchor a no-compromise stereo system with large floorstanding loudspeakers, difficult impedance curves or substantial room volume. A single amplifier can also power a critical home-theater channel where extreme output and headroom are required.
Compared with the McIntosh MC611, the MC1.25KW doubles the rated output from 600 watts to 1,200 watts while retaining Quad Balanced circuitry, Autoformer outputs, Power Guard and Sentry Monitor. The MC611 remains the more practical option for many systems, while the MC1.25KW is intended for listeners who need greater headroom and maximum speaker control.
Installation and Placement
The MC1.25KW weighs 158 pounds and measures 17-3/4 inches wide, 12-5/16 inches high and 22 inches deep. It should be placed on a properly rated amplifier stand or equipment platform with adequate ventilation around the heatsinks. Because two units are needed for stereo operation, floor loading, shelf capacity, electrical service and delivery access should be planned before installation.
McIntosh MC1.25KW Specifications
| Amplifier Type | 1-channel solid state monoblock power amplifier |
|---|---|
| Power Output | 1,200 watts into 2, 4 or 8 ohms |
| Circuit Configuration | Quad Balanced |
| Output Type | McIntosh Autoformer™ |
| Total Harmonic Distortion | 0.005% |
| Signal-to-Noise Ratio | 124dB balanced; 120dB unbalanced |
| Dynamic Headroom | 2.2dB |
| Damping Factor | Greater than 40 wideband |
| Frequency Response | +0/-0.25dB from 20Hz–20kHz; +0/-3dB from 10Hz–100kHz |
| Inputs | 1 balanced XLR and 1 unbalanced RCA |
| Outputs | Balanced and unbalanced signal outputs; 2, 4 and 8-ohm speaker outputs |
| Dimensions | 17-3/4 inches W x 12-5/16 inches H x 22 inches D |
| Weight | 158 lbs; 184 lbs shipping weight |
| Warranty | 3-year limited warranty |
Frequently Asked Questions
Is the McIntosh MC1.25KW sold as a pair?
No. The MC1.25KW is a one-channel monoblock amplifier sold individually. Two are required for a conventional stereo system.
Can the MC1.25KW power 2-ohm speakers?
Yes. Dedicated 2, 4 and 8-ohm Autoformer outputs allow it to deliver the full rated 1,200 watts into each supported impedance.
Does the MC1.25KW require a preamplifier?
Yes. It is a power amplifier and should be connected to a compatible stereo preamplifier or home-theater processor through its balanced or unbalanced input.
How does the MC1.25KW compare with the MC611?
The MC1.25KW provides 1,200 watts versus the MC611’s 600 watts. It is substantially larger and heavier and is designed for systems requiring additional dynamic headroom, current capability and control.
Can one MC1.25KW be used in a home theater?
Yes. A single unit can power one front, center or other high-demand channel, while multiple units can be used throughout a reference-level theater system.
Authorized McIntosh Dealer Support
Audio Exchange is an authorized McIntosh dealer serving Richmond, Virginia and customers throughout the United States. Our team can assist with speaker matching, preamplifier selection, electrical requirements, equipment support and delivery planning. Explore additional models in our McIntosh Power Amplifiers collection.
