McIntosh MC451 1-Channel Dual Mono Amplifier - Ultra Sound & Vision

McIntosh MC451 1-Channel Dual Mono Amplifier

R 348,000.00

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Standard delivery within 2–5 business days

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McIntosh MC451 1-Channel Dual Mono Amplifier

Includes our Hybrid Drive^™ technology that uses the best of vacuum tubes and solid state to produce the best sound performance
Designed with bi-amping loudspeakers in mind
150 Watt vacuum tube amplifier and 300 Watt solid state amplifier on one chassis
Vacuum tube section powers mid and upper drivers
Solid state section drives power hungry woofers
DualView™ Power Output Meter.

A Stunning Sound Experience.

The MC451 Dual Mono Amplifier joins the MC901 in offering the ultimate solution to bi-amping a loudspeaker. Like the MC901, the MC451 uses our Hybrid Drive^™ technology that combines a separate vacuum tube and solid state amplifier onto one single chassis to produce the best possible sound performance from a bi-ampable speaker. Unlike the larger MC901, the MC451 has a more conventional McIntosh form factor and size, allowing it to fit into home audio systems, racks, and furniture more easily. Adding a pair of MC451s to your stereo system will allow your prized speakers to perform like never before.

A pair of MC451 Dual Mono Amplifiers powering a home audio system with bi-ampable XRT1.1K speakers.

"I’ve heard enough systems and recordings to know that the midrange and treble nuances provided by the MC451 will improve the musicality of a very substantial number of high-end rigs and suit the personal taste of a wide range of audiophiles. It did an outstanding job amplifying every source I auditioned, from the latest LPs and SACD/DSD to high-resolution PCM recordings… Put as simply as possible, the MC451 sounds different enough to help redefine the state of the art for many high-end audiophiles." - The Absolute Sound

The MC451 is comprised of a 150 Watt vacuum tube amplifier and a 300 Watt solid state amplifier, which is more than enough power to drive virtually all speakers. The vacuum tube section drives the speaker's midranges and tweeters, while the solid state section drives the woofers. The 150 Watt vacuum tube amplifier is powered by four KT88 output tubes which are located under a removable wire cage, plus two 12AT7 and one 12AX7A signal tubes; it uses our patented Unity Coupled Circuit output transformer to deliver its full 150 Watts into almost any speaker regardless if it has 2, 4 or 8 Ohm impedance. Similarly, the 300 Watt solid state amplifier delivers its full 300 Watts into a 2, 4 or 8 Ohm impedance speaker via our Autoformer^™ technology.
The two amplifiers in the MC451 are designed to work together in a synergistic relationship and are specifically engineered to assure that each only amplifies its intended frequencies. The large but quiet toroidal transformer generates enough power so that neither amplifier robs power or performance from the other. All of this results in easy bi-amping with unparalleled performance and sound reproduction from your speakers.
	Bi-amping your speakers with the MC451 is easy. No longer do you need fiddle with two separate amplifiers, an external crossover, and a lot of trial and error to properly configure the two separate amplifiers with often times only so-so results. The MC451 solves these hassles thanks to its internal, adjustable crossover. The MC451’s crossover tailors the output frequency range of each amplifier section to the attached loudspeaker. Simply set the CROSSOVER POINT knob on the back of the MC451 to the loudspeaker’s crossover point, then frequencies below the crossover point will be sent to the solid state amplifier and frequencies above it will be sent to the vacuum tube amplifier. This adjustable crossover allows you to optimize the performance of both amplifier sections to your speaker's specifications and to your listening preferences. Gain levels for the vacuum tube amplifier can be adjusted from -6dB to +3dB. A direct feed can also be connected to each amplifier section, thus bypassing the internal crossover.
The MC451 features our DualView^™ Power Output Meter. The DualView meter features two of our traditional, fast responding mechanical meters stacked above and below each other in a single meter window; one meter is dedicated to the 150 Watt vacuum tube amp and the other to the 300 Watt solid state amp. Each meter operates independently of the other and displays the real time power reading of each amplifier section.

In addition to everything already mentioned, the MC451 comes with a multitude of other McIntosh amplifier the technologies:

Power Guard^® that monitors and adjusts the input signal in the 300 Watt solid state amplifier section in real time, then makes inconspicuous volume adjustments to prevent harsh sounding distortion and potential speaker damaging clipping.
Power Guard Screen Grid Sensor^® (SGS). The 150 Watt vacuum tube amplifier section features our Power Guard SGS^® technology. 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.
Sentry Monitor^™ observes the output current and shuts the amplifier off if it ever exceeds safe limits.
Power Control that can send power on/off signals to other connected McIntosh components for easy system power up and shutdown.
Our patented, gold-plated Solid Cinch^™ speaker binding posts that easily and securely attach the speaker cables.
A McIntosh Monogrammed Heatsink^™ that is connected to advanced high current output transistors to efficiently cool the solid state amplifier section.
Our Power Management System that will turn the entire unit off after a set amount of time when no input signal has been detected.

Specifications

Electronic Specifications
FTC Power Output Rating	Solid State section: 300 W Vacuum Tube section: 150 W
Power Output per Channel	Solid State section: 300 W 2, 4 or 8 ohms Vacuum Tube section: 150 W into 2, 4 or 8 ohms
Number of Channels	1
Total Harmonic Distortion	Solid State section: 0.005% maximum harmonic distortion at any power level from 250 milliwatts to rated power, 20Hz to 20kHz Vacuum Tube section: 0.5% maximum harmonic distortion at any power level from 250 milliwatts to rated power, 20Hz to 20kHz
S/N below rated output	Solid State section: 118dB Vacuum Tube section: 112dB
Dynamic Headroom	Solid State section: 2.5dB Vacuum Tube section: 1.2dB
Damping Factor	Solid State section: >40 Vacuum Tube section: >18
Rated Power Band	Solid State section: 20Hz to 20kHz Vacuum Tube section: 20Hz to 20kHz
Frequency Response	Solid State section: +0, -0.25dB from 20Hz to 20kHz +0, -3dB from 10Hz to 100kHz Vacuum Tube section: +0, -0.5dB from 20Hz to 20kHz +0, -3dB from 10Hz to 70kHz
Control
Remote Power Control	Yes
Multi-Channel DB25 Cable	N/A
Connectivity
Speaker Binding Post Type	Patented Solid Cinch™ Speaker Binding Posts
General Specifications
Circuit Configuration	Solid State section: Push-Pull Complementary Vacuum Tube section: Unity Coupled
Circuit Design	Solid State and Vacuum Tube
Mono Bridge	No
Mono Parallel	No
Output Type	Solid State section: Autoformer™ Vacuum Tube section: Unity Coupled Output Transformer
Meters	DualView™ Power Output Meter
Meter Light Switch	Yes
Balanced Input	2 (1 Solid State or Mono, 1 Vacuum Tube)
Front Panel	Glass
Illumination	Direct LED
Chassis Style	Polished stainless steel & black painted steel
Weights & Dimensions
Unit Dimensions (W x H x D)	17-7/8" (45.4cm) x 11-13/16" (30cm) x 21-1/2" (54.6cm)
Unit Weight	133 lbs (60.3 kg)
Shipping Weight	159 lbs (72.1 kg)

Caring for your Speakers and Amplifiers

To Keep your equipment safe these are some best practices to note. Please be advised that this is only to reduce the risk of misuse and is not an exhaustive list.

Speakers

Speaker terminals are marked red and black, ensure your amplifier to the speakers are wired on the same colours
Ensure no loose speaker wire from the red touches a loose wire from the black as this will lead to a short circuit and damage either the speaker, the amplifier or both.
Not all speakers are designed to play at max volume, kindly consider the pairing of your amplifier and speakers
Speaker cabinets cannot be replaced please handle with care.

AV & Stereo Amplifiers

If your amplifier has HDMI ports, ensure all devices are off before plugging in the HDMI cable
Turn off the amplifier before swoping out or adding speaker cable
Amplifiers generate heat, place them in a well ventilated space. if possible avoid having anything on top of the unit.
adding a surge protector can assist with power dips which are likely to damage your devices. Isotek and Furman are industry standard.
Dusty environments can sometimes lead to accumulation of dust in the electronic components that might affect heat regulation

Shipping & Returns

Free shipping on orders over R500 within the country.
Standard delivery within 2–5 business days. Delays will be communicated. This might vary slightly depending on your location.
Return items in original condition for a full refund. (unopened state)
Returns that are open/unboxed will be subject to a handling fee. Refunds will only be processed after testing the unit.

Order special instructions

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McIntosh MC451 1-Channel Dual Mono Amplifier

McIntosh MC451 1-Channel Dual Mono Amplifier

Specifications

Caring for your Speakers and Amplifiers

Speakers

AV & Stereo Amplifiers

Shipping & Returns

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