McIntosh

McIntosh MC451 Dual Mono Amplifier

Name: McIntosh MC451 Dual Mono Amplifier
Brand: McIntosh
SKU: MC451
Price: 25500.00 CAD
Availability: OutOfStock

$25,500.00 CAD

The McIntosh MC451 Dual Mono Amplifier combines a 150W vacuum tube amplifier for midrange and treble with a 300W solid-state amplifier for bass, all within a single chassis. Designed for audiophiles and home theater enthusiasts, it delivers precise, high-fidelity sound and simplifies bi-amping setups with its integrated crossover.

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Description

The McIntosh MC451 Dual Mono Amplifier brings together the signature sound of tubes and the precision of solid-state amplification in a single chassis. Featuring a 150W vacuum tube amplifier for mid and high frequencies and a 300W solid-state amplifier for low frequencies, it provides the flexibility and clarity needed for today’s most demanding audio systems. Designed to deliver dynamic power and pure musicality, the MC451 fits perfectly into serious two-channel setups or bi-amplified speaker systems.

Key Features

Dedicated 150W tube amplifier and 300W solid-state amplifier built into one unit
Hybrid Drive™ technology for tailored speaker performance
Adjustable crossover and independent gain controls for fine-tuning sound
Quad-balanced design for exceptional low noise and distortion
Classic McIntosh styling with dual blue watt meters and polished finish
Autoformer™ technology ensures consistent power into 2, 4, or 8 Ohm speakers
Built-in Power Guard® and Sentry Monitor™ circuits for safe operation

Why Buy

The McIntosh MC451 is ideal for music lovers who want the character of vacuum tubes with the impact of solid-state power. Designed for bi-amping or fine-tuning performance, it offers unmatched control and musical expression in a refined package.

Perfect balance of tube warmth and solid-state strength
Seamless bi-amplification for superior system optimization
McIntosh build quality and visual appeal that lasts a lifetime

Specifications

General Information
Brand	McIntosh
Model	MC451
Type	Dual Mono Amplifier
Amplifier Class	Tube (Mid/High), Solid-State (Low)
Number of Channels	2 (independent mono amplifiers in one chassis)
Power Output	150W Tube (mid/high) + 300W Solid-State (low)
Country of Manufacture	United States
Audio
Frequency Response	+0, -0.5dB from 20Hz to 20kHz; +0, -3dB from 10Hz to 100kHz
Total Harmonic Distortion (THD)	0.08% max from 250mW to rated power
Signal to Noise Ratio	Solid-State: 120dB; Tube: 112dB
Damping Factor	Greater than 40 (solid-state section)
Speaker Impedance	2, 4, or 8 Ohms
Dynamic Headroom	1.2dB
Connectivity
Input Types	Balanced XLR, Unbalanced RCA
Output Types	Gold-plated speaker binding posts
Power Control Input/Output	Yes (for automatic power on/off with connected components)
Data Ports	Yes (for McIntosh data communication)
Battery & Charging
Battery Powered	No (AC powered)
Power Requirements	120V/230V 50/60Hz, factory configured
Power Consumption (Idle)	120W
Power Consumption (Max)	850W
Features
Meter Type	Dual Blue Watt Meters
Circuitry Protection	Power Guard®, Sentry Monitor™
Tube Compliment	4 x KT88, 2 x 12AX7A, 2 x 12AT7
Chassis Material	Polished Stainless Steel
Cooling System	Thermal controlled fans
Physical Specifications
Dimensions (W x H x D)	17-1/2" (44.45cm) x 9-7/16" (24cm) x 20-3/8" (51.75cm)
Weight	93 lbs (42.2 kg)
Finish	Gloss black with polished stainless steel chassis
LED Illumination	Yes (for meters and logos)
In the Box
Included Accessories	Power cable, Manual, Spare fuses, Warranty card
Warranty
Warranty Period	3 Years (with registration)
Customer Support Info	Contact McIntosh Labs or Authorized Dealer

McIntosh MC451 Dual Mono Amplifier FAQs

Can I use the MC451 with speakers that have built-in crossovers?

Yes. The MC451 is designed to work seamlessly with speakers that have internal passive crossovers. Its internal adjustable crossover allows you to optimize performance without modifying your speakers.

Is it possible to bypass the MC451's internal crossover?

Absolutely. The MC451 provides the option to bypass its internal crossover by connecting a direct feed to each amplifier section. This is ideal if you're using external room correction or crossover systems.

Does the MC451 deliver full power into different speaker impedances?

Yes, you can replace the stock tubes with other brands. However, it's essential to use high-quality tubes that meet McIntosh's specifications to maintain optimal performance and reliability. Always ensure compatibility and consult with a professional if unsure.

Can I replace the stock tubes in the MC451 with different brands?