McIntosh MC1.25KW

Name: McIntosh MC1.25KW Power Amplifier
Brand: McIntosh

2001 - 2007

The McIntosh MC1.25KW represents one of the most powerful amplifiers ever produced by McIntosh Laboratory. Delivering 1,200 watts of continuous power into 8 ohms (and over 2,000 watts into 4 ohms), this massive monoblock amplifier was designed for the most demanding speakers and the largest listening rooms. It stands as a testament to McIntosh's engineering capabilities and their commitment to unrestricted dynamic range.

Specifications

Type	Solid-state monoblock power amplifier
Power Output	1,200W @ 8Ω, 2,000W @ 4Ω
Frequency Response	20Hz - 20kHz (+0, -0.25dB)
Total Harmonic Distortion	0.005% (20Hz - 20kHz, rated power)
Signal-to-Noise Ratio	124dB (below rated output)
Input Sensitivity	2.0V (balanced), 4.0V (unbalanced) for rated output
Damping Factor	100 (8 ohms)
Inputs	Balanced XLR, Unbalanced RCA
Dimensions	17.75" W × 11.5" H × 22" D
Weight	150 lbs (68 kg)

Quad Balanced Design

The MC1.25KW features McIntosh's exclusive Quad Balanced circuit topology, which uses four amplifier circuits in a push-pull arrangement to cancel noise and distortion. This design delivers the lowest possible noise floor and the most accurate signal reproduction, essential for revealing the subtle details in high-resolution recordings.

Power Guard and Sentry Monitor

McIntosh's patented Power Guard circuit prevents clipping that could damage speakers, while the Sentry Monitor protects the amplifier itself from damage due to short circuits or mismatched loads. These protection circuits operate transparently, ensuring the amplifier delivers its full performance while safeguarding your investment.

Key Features

Massive Power Supply: 3.6 kVA toroidal transformer with 120,000µF of capacitance
Quad Balanced: Four amplifier circuits for ultimate noise rejection
Autoformer Output: Delivers full rated power to 2, 4, or 8 ohm loads
Power Guard: Waveform comparison circuit prevents clipping
Sentry Monitor: Protects against short circuits and thermal overload
Blue Watt Meters: Iconic McIntosh power meters with LED backlighting
Gold-Plated Connectors: Ensures optimal signal transfer

Applications

The MC1.25KW was designed for the most demanding applications: driving large electrostatic speakers, powering professional cinema systems, or providing headroom for the most dynamic orchestral recordings. Its ability to deliver massive instantaneous current makes it ideal for reproducing the transients and dynamic swings that define live music.

Legacy

The MC1.25KW stands as one of McIntosh's most ambitious amplifier designs. Its combination of massive power, low distortion, and bulletproof reliability exemplifies the McIntosh philosophy. While newer designs have matched or exceeded its power output, the 1.25KW remains a collector's item and a reference for what is possible in solid-state amplification.