New McIntosh MC901 Dual Mono Amplifier

[PeterMusic]

Originally Posted by Still-One

Hmmm. The only thing that makes me think you are commenting on the same amp relates to the "cupholder".

They only weigh 12lbs more than a 1.2K and many of those are or have been owned by individuals here.

I have no issues with the spec or pricing for such an amp. I am guessing that at some point a couple of individuals on this site will acquire them.

What I was trying to get at is the over the top nature of the whole thing--at some point it becomes absurd. That's the way the press release reads to me--they took every possible parameter and cranked it to 11. Of all the specs, the one that is the most concerning is physical size--7" more than the 1.2K is another 14" total. It's something like 8 square feet of surface area (with a few inches between them), and those tubes are gonna be hot. Yipes!-- that's a lot of space, even in a dedicated room.

I should have left out the mention of price. Let's hope that the 901s sound so amazing that they are worth the expense and the dimensions compared to other great amps.

[1KW]

Fortunately my Strads can’t be bi amped. . Another potential use for this could be to drive multiple pairs of speakers . I’m glad to see Mcintosh is offering something like this. Looking forward to Ivan’s impressions.

[Vintage Pete]

Originally Posted by Masterlu

I may just need to buy a pair.

I have very little doubt you will Ivan....these are just too cool not to.

[dixon007]

Originally Posted by RaceCarDriver

BTW, it’s on the website, no manual yet.

mcintoshlabs.com/products/amplifiers/MC901

Very intriguing and very big.

[djwhog]

Well I guess it is like but not the same as owning 2301s and 601s. So it is like 4 scaled down to 2 sort of?


Well heck I sure would love to hear these in my system. I have 4 way towers and the idea of bi amping like this is slick. I have used my 452 and 601s to do something similar. But I settled on just the 601s and bi-wire and not the best option of bi-or tri amp. Would love tubes with that much power


Lots of BIG $$$$ but it should be a great amp.


My only concern is separation etc.

[jdandy]

Originally Posted by djwhog

Lots of BIG $$$$ but it should be a great amp.

My only concern is separation etc.

Dave.......If by "separation" you are talking about crosstalk, unwanted signals in one amp getting into the other amp, like the crosstalk issue commonly referred to in stereo amplifiers, this should be a nonissue with the MC901. With independent power supplies on a single chassis for each amplifier the only thing shared between the tube and solid state amplifiers is the incoming power cord. It would be no different than plugging a MC2301 and a MC611 into a single dedicated outlet. There will be no separation issues with this amplifier design as far as I can determine from the present available information.

I think the new McIntosh MC901 is an absolute home run. It is a bold and unique departure from what is available from other manufacturers while still paying homage to some of the design cues that keep McIntosh aficionados happy and drawn to the products. It is good to see McIntosh bring forth another true statement audio component that is destined to be a genuine classic.

[Robert_Anderson]

Originally Posted by Masterlu

Announcing the McIntosh

MC901 Dual Mono Amplifier

McIntosh is proud to announce the new MC901 Dual Mono Amplifier.

Legendary home audio company McIntosh has been perfecting vacuum tube amplifiers since the 1940s and solid state amplifiers since the 1960s. Their amplifiers have been used at many historic events including presidential inaugurations and Woodstock, as well as in landmark sound systems like the Grateful Dead's Wall of Sound and Despacio. From that heritage comes a truly one-of-a-kind home audio amplifier only they could dream of, design and build as the ultimate solution for bi-amping loudspeakers: the new McIntosh MC901 Dual Mono Amplifier.

The MC901 is a monoblock amplifier that drives a single speaker. But it is unlike any other monoblock amplifier. What makes the MC901 so unique 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.

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 specifically 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. All of this results in easy bi-amping with unparalleled performance and sound reproduction from the speakers.



Prior to the MC901, bi-amping a speaker required two separate amplifiers. It also required an external crossover, along with a lot of trial and error, to properly configure the two detached amplifiers so they worked together as best as possible. The MC901 solves this issue thanks to its internal, adjustable crossover with the controls easily accessible on the top of the unit. These adjustable crossover filters allow the user to optimize the performance of both amplifier sections to their listening preferences. Relative gain levels for each amplifier section can be adjusted from -6dB to + 3dB. A direct feed can also be connected to each amplifier section, thus bypassing the filters.

Like virtually all McIntosh amplifiers, the MC901 features an iconic "McIntosh Blue" Watt meter, which has come to be recognized around the world as a symbol of quality audio. 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, fast responding 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.



While an entirely new design, the MC901 comes with the technology one would expect from a McIntosh amplifier: Power Guard® in the 600 Watt solid state amplifier section, Sentry Monitor™, Quad Balanced design, Power Control, Solid Cinch™ speaker binding posts, McIntosh Monogrammed Heatsinks™, and McIntosh's eco-friendly Power Management System.

A brand new technology in the 300 Watt vacuum tube amplifier section of the MC901 is Power Guard Screen Grid Sensor™ (SGS). Power Guard SGS™ helps prevent premature vacuum tube failure by monitoring the screen grid current in the KT88 output vacuum tubes. If the current becomes too high, a circuit in Power Guard SGS is activated which then dynamically attenuates the input signal in real time to keep the vacuum tubes operating at safe levels.

Although the MC901 may look different than any McIntosh product before it, a quick glance reveals signature McIntosh design cues. The top is highlighted by a series of diagrams printed on glass that outline the basic circuitry and specifications of the unit, along with a glass nameplate trimmed with a circular aluminum ring that's finished to match the front panel endcaps. The sides are adorned with vintage McIntosh-styled die cast aluminum name badges. Two classic McIntosh knobs are located on the front of the polished stainless steel chassis, and direct LED backlighting illuminates the DualView meter, McIntosh logo and the lettering on the black glass front panel. The uncompromising level of fit and finish that is expected of a McIntosh product completes the MC901.


Unit Dimensions (W x H x D):
17-1/2" (44.5cm) x 13-1/4" (33.7cm) x 29-1/2" (74.9cm)

Shipping Dimensions (W x H x D):
24-13/16" (63cm) x 18-3/8" (46.7cm) x 36-1/4" (92.1cm)

Unit Weight:
170 lbs (77.1 kg)

Shipping Weight:
190 lbs (86.2 kg)

Expected to begin shipping December 2019

• US MSRP: $17,500 each Mono Amplifier

A one-of-a-kind, ultimate solution for bi-amping loudspeakers with dual inputs

Well, did you?

[Masterlu]

Originally Posted by Robert_Anderson

Well, did you?

Nope, I have no system for them.

[djwhog]

Originally Posted by jdandy

Dave.......If by "separation" you are talking about crosstalk, unwanted signals in one amp getting into the other amp, like the crosstalk issue commonly referred to in stereo amplifiers, this should be a nonissue with the MC901. With independent power supplies on a single chassis for each amplifier the only thing shared between the tube and solid state amplifiers is the incoming power cord. It would be no different than plugging a MC2301 and a MC611 into a single dedicated outlet. There will be no separation issues with this amplifier design as far as I can determine from the present available information.

I think the new McIntosh MC901 is an absolute home run. It is a bold and unique departure from what is available from other manufacturers while still paying homage to some of the design cues that keep McIntosh aficionados happy and drawn to the products. It is good to see McIntosh bring forth another true statement audio component that is destined to be a genuine classic.

Yes that was what I was thinking Dan in your 1st paragharph that was my thinking, thanks for giving me a better understanding, I did not spend enough time to read about dual power supplies. Dummy me thank you.


So I will take 2 of these please !

[audio5]

Mcintosh 901 photo reminds me of steam locomotive.