McIntosh MC1.2KW
The MC1.2KW is a solid-state monoblock power amplifier - one channel per chassis, 1,200 watts. McIntosh's own literature calls it the most powerful single-chassis monoblock the company has built. The 1,200-watt rating holds across 2, 4, and 8 ohms. That is the point of McIntosh's Autoformer output technology: full rated power is available no matter what the speaker presents. Each unit weighs 147 pounds, so a stereo pair is close to 300 pounds of iron and glass before anything gets plugged in.
The circuit is McIntosh's Quad Balanced design, which the company describes as cancelling virtually all noise and distortion that may have crept into the audio signal. The front panel carries Power Guard, McIntosh's clipping-protection circuit, along with the large blue meter that has become the visual signature of the modern McIntosh line. The service manual covers serial numbers YF1001 and above and documents the internals in detail. The amplifier is built around separate driver and meter power supply boards, with a mix of JFET and bipolar transistors in the signal path and a bank of 0.5-ohm wirewound emitter resistors in the output stage. Rated distortion is 0.005% maximum at any power level from 250 milliwatts to full rated output, 20Hz to 20,000Hz, with 2dB of dynamic headroom and a wideband damping factor above 40. Signal-to-noise is quoted at 124dB below rated output on the balanced input (120dB unbalanced). Frequency response is +0, -0.25dB from 20Hz to 20kHz. Input sensitivity is 2.5 volts unbalanced or 5 volts balanced into a 10,000-ohm load. The chassis measures 17-3/4 inches wide, 12-5/16 inches tall including feet, and 22 inches deep. Shipping weight is 172 pounds.
Pricing is where the record gets muddy. Tone (undated, via Audio Exchange) placed the MC1.2KW at a $25,000 price point and framed it as the more manageable alternative to the flagship MC2KW monoblocks at $70,000. It was still not a budget component, as the same piece put it, but it left a buyer money to build out the rest of a system. Other listings give an MSRP of $22,000, and the archive has not been able to reconcile the two figures. Treat the original retail price as somewhere in the low-to-mid twenties and verify against the specific unit's documentation. Production years are not recorded here either. What is solid: 1,200 watts, 147 pounds, Autoformer, Quad Balanced, Power Guard, and a position one rung below the MC2KW.
One caution for shoppers: the MC1.2KW and the later MC1.25KW are different amplifiers, and listings, manuals, and dealer pages routinely conflate the two. Used MC1.2KW monos have surfaced around $7,700 for a single unit, while MC1.25KW examples have listed considerably higher.
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