Your browser is out-of-date!

Update your browser to view this website correctly. Update my browser now


McIntosh Announces MC901 Dual Mono Amplifier

The company calls it the “ultimate solution for bi-amping loudspeakers.”

McIntosh MC901 front

McIntosh has announced the MC901 dual mono amplifier. The MC901 is a monoblock amplifier that drives a single speaker. What makes the MC901 so unique, according to the company, is that it’s two amplifiers combined into one. Adding to the uniqueness is that each amplifier is of differing design philosophies: the MC901 consists of a 300-watt vacuum tube amplifier attached to a 600-watt solid state amplifier on one unified chassis.

The 300-watt vacuum tube portion powers the speaker’s mid and upper drivers via eight KT88 output tubes, plus four 12AT7 and two 12AX7A signal tubes; the solid-state section delivers 600 watts of dedicated power to the power-hungry woofers. The 300-watt vacuum tube amp in the MC901 uses McIntosh’s patented Unity Coupled Circuit output transformer – the same technology McIntosh was founded on in 1949 – to deliver its full 300 watts into almost any speaker regardless if it has 2, 4- or 8-ohm impedance. Similarly, the 600-watt solid state amp delivers its full 600 watts into a 2, 4- or 8-ohm impedance speaker via McIntosh’s Autoformer technology.

McIntosh MC901 back

Vacuum tubes do not perform at their best when they are amplifying lower frequencies that are not being used by the loudspeaker. With the MC901, the vacuum tube amp will not be burdened with low-end reproduction as the solid-state section will drive these frequencies. The two amplifier sections of the MC901 are designed to work together in a synergistic relationship and are engineered to assure that each section only amplifies its intended frequencies. Each amplifier section has its own discrete power supply, so neither siphons power or performance away from the other.

Like virtually all McIntosh amplifiers, the MC901 features an the “McIntosh Blue” watt meter. And just like the MC901 itself is a new design, so too is its meter with the introduction of McIntosh’s new DualView Power Output Meter. The DualView meter features two of McIntosh’s traditional, mechanical meters stacked above and below each other in a single meter window; one meter is dedicated to the 300-watt vacuum tube amp and the other to the 600-watt solid state amp. Each meter operates independently of the other and displays the real time power reading of each amplifier section.

Orders for the MC901 can now be placed with Authorized McIntosh dealers with shipping expected to begin in December 2019. Suggested retail price (VAT, shipping and any customs duties related to current standards of individual countries are excluded): $17,500 USD.

For more information, visit