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McIntosh Labs

MC451 Dual Mono Amplifier

SKU: MC451

$22,800.00
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Processing/Shipping Time

All online orders are typically processed within 1-2 business days. Orders received after 1pm EST or on weekends will be processed on the next business day.

Our business hours are Monday to Friday from 10am to 5pm EST.

Due to our inventory management practices, we do not maintain a large stock of products; instead, most items are sourced from our suppliers upon order. We do focus on having a broad selection of brands and models for in store demo purposes. This may impact shipping times, as items are procured and prepared for shipment as soon as possible. If your item is not in stock, we will send you an email to update you on the status of your order. We appreciate your understanding and patience.

  • Standard Delivery for in stock items is between 2-3 business days within Ontario & Quebec, 3-5 business days for Eastern Canada and 4-7 business days for Western Canada. Northern or remote Canadian customers should contact us to confirm shipping availability and costs. During peak sales periods (for example Black Friday, Cyber Monday and Boxing Day/Week) up to an additional 5 (five) business days may be needed.
  • Items not in stock will be shipped to our Newmarket store and then shipped to you. Turnaround time may depend on the manufacturer/distributor. If a manufacturer or distributor has stock of the item, then we can normally expect to receive the product within 10 business days at which point we will immediately ship it to you.
  • If we become aware that delivery time to you will exceed 16 business days we will contact you to confirm the order or review options.

If your product is damaged, defective, or dead on arrival you are eligible for a refund or exchange within 15 days of the product being delivered to you.  

If you are not satisfied with your purchase and would like to request an exchange, please note the following:

  • All returns and exchanges will only be accepted on products with no damage due to misuse and have all original packaging, accessories, manuals and the original sales receipt.
  • Refunds paid by credit card/PayPal will be returned in the same method payment was received when possible. Wire Transfer payments will be refunded in the form of company check or E-Transfer. For exchanges with a difference in value, the balance will be charged or refunded in the same method as the original payment was received.
  • Liptons Audio Video reserves the right to assess whether the product is defective or not. Products with physical damage will not be accepted for refund or exchange.
  • Exchanges will be offered only on non-special order items with return shipping at the buyer's expense and must be shipped with insurance reflecting the transaction value and must ship via a trackable courier/delivery company. Exchanges will only apply to unopened products received in new condition
  • Products with non matching serial numbers to either the packaging or the recorded Serial number associated with the transaction are not eligible for refunds or exchanges
  • Products with modified or missing serial numbers/UPC codes or other identifying information are not eligible for refunds or exchanges
  • Products that are not returned with all original packaging, equipment, accessories, manuals and software will not be refunded or will be charged a restocking fee at the discretion of Liptons Audio Video.
  • Products must be new and show no signs of use. Any sign of use – Including installation, scratches or other signs of use such as physical marking, painted grills, screw holes, cut wires or similar would not be returnable
  • Equipment sustaining damage from operation or misuse will be deferred to the manufacturer's warranty and replacement policies. 
  • Replaced items will be exchanged for the same model
  • If a product you purchased from us proves to be defective within 15 days from purchase, we will replace it with an equivalent new unit at no charge. If the item is returned through shipping, the exchange will be processed once we receive the parcels & confirm that the product is not working. Exchange processing will take 10-20 business days from the day we receive the parcel.


Final Sale Items/Exclusions


  • Special order items including cut to length cabling and custom furniture
  • Headphones/earbuds/in-ear headphones for hygienic reasons
  • Turntable cartridges/styli
  • Projector lamps
  • Installed in-ceiling, in-wall speakers or subwoofers
  • No refunds or exchanges on products purchased for commercial use.
  • Clearance, consignment items.

Online Order Returns/Exchanges Process

Please contact us to begin our online return process at info@liptons.ca. Once we have received the details about your order, we will generate a Return Merchandise Authorization (RMA) number and send you the RMA form to be completed and sent back with the parcel.

Pack the item back in its original packaging with all parts, accessories and manuals. We recommend packing the item into an additional box meant for shipping. Return shipping costs are the responsibility of the customer. Any damages that incur during return shipping will also be the responsibility of the customer.

In the event the item was offered free shipping, the original shipping charges and handling fees, for the returned item(s), will be deducted from the refund. If the item is refused and returned to Liptons Audio Video without record of cause and evidence of damage any return freight costs will also be deducted from the refund.

In Store Returns & Exchanges

Returns on damaged, defective and DOA products, as well as exchanges can be made in store. Please note our store hours https://liptons.ca/pages/contact and be sure to bring your receipt or online order confirmation. 

Product Warranty

All new products carry full manufacturer warranty which varies for each product category and manufacturer. Refer to the manufacturer’s warranty information for exact details. 

Demo products come with either the full manufacturer warranty or the balance of manufacturer warranty unless otherwise specified.

Open Box products come with either the full manufacturer warranty or the balance of manufacturer warranty unless otherwise specified.

Used and Consignment pieces will have individually specified warranty.  If no warranty is listed, no warranty is available, but the unit has been tested in store and determined to be working properly unless otherwise specified.

Installation Warranty

All Liptons Audio Video installations come with a one-year warranty against workmanship performed by us. Defective equipment covered under manufacturer warranty is subject to a removal and reinstallation charge of one hour at our current installation rates. Installation warranty claims can be made within one year of installation date by phone at 905-898-7133 or email at info@liptons.ca

If you have any questions or concerns regarding product returns, exchanges and warranty claims, please call is at 905-898-7133 or email info@liptons.ca

Experience unparalleled audio quality with the MC451 Dual Mono Amplifier. This innovative device delivers exceptional sound through its dual mono design, resulting in crisp, clear, and immersive soundscapes. With its expertly crafted construction and advanced technology, the MC451 is the ultimate choice for audiophiles and industry professionals alike.

  • Includes 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

Power & Performance

  • Power Output per Channel: 450 Watts Total (150 Watts Vacuum Tube + 300 Watts Solid State)
  • Number of Channels: 1 (Monoblock designed for bi-amping)
  • Total Harmonic Distortion: 0.005% (Solid State); 0.5% (Vacuum Tube)
  • Signal-to-Noise Ratio: 118dB (Solid State); 112dB (Vacuum Tube)
  • Frequency Response: +0, -0.25dB (SS) / -0.5dB (Tube) from 20Hz to 20,000Hz
  • Dynamic Headroom: 2.5dB (Solid State); 1.2dB (Vacuum Tube)
  • Damping Factor: >40 (Solid State); >18 (Vacuum Tube)

Audio Features

  • Hybrid Drive™ Technology: Combines a 150W vacuum tube amp for mids/highs and a 300W solid-state amp for bass on one chassis
  • Output Types: Patented Autoformer™ (Solid State) and Unity Coupled Circuit (Vacuum Tube) for full power into 2, 4, or 8 Ohms
  • Internal Crossover: Adjustable frequency knob (100Hz to 1kHz) to tailor the hand-off between tube and solid-state sections
  • Tube Complement: 4 x KT88, 2 x 12AT7, and 1 x 12AX7A
  • Gain Control: Adjustable vacuum tube gain range from -6dB to +3dB to perfectly balance with the solid-state section
  • Protection Technology: Power Guard® (Solid State), Power Guard Screen Grid Sensor® (Vacuum Tube), and Sentry Monitor™

Streaming & Connectivity

  • Analog Inputs: 1 x Balanced (XLR) pair, 1 x Unbalanced (RCA) pair; features "Mono" input for internal crossover or separate inputs for external crossovers
  • Speaker Terminals: Two sets of patented gold-plated Solid Cinch™ binding posts (one set for SS, one for Tube)
  • System Control: 1 x Power Control (Trigger) In, 1 x Power Control Out
  • Direct Feed: Switchable option to bypass the internal crossover when using an external active crossover
  • Power Management: Eco-friendly "Auto Off" feature shuts the unit down after 30 minutes of no signal
  • Input Selection: Rear-panel switches to toggle between Input modes and crossover configurations

Installation & Dimensions

  • Unit Dimensions (W x H x D): 17-7/8" x 11-13/16" x 21-1/2" (45.4cm x 30cm x 54.6cm)
  • Unit Weight: 133 lbs (60.3 kg)
  • Shipping Weight: 159 lbs (72.1 kg)
  • Chassis Design: Polished mirror-finish stainless steel with a black painted steel base
  • Thermal Management: McIntosh Monogrammed Heatsinks™ for the solid-state section and a removable wire cage for the tubes
  • Placement: Requires significant vertical clearance (19 inches recommended) to allow for heat dissipation from the vacuum tubes

Design & Build

  • Front Panel: Signature black glass with three viewing windows for the vacuum tubes and illuminated logo
  • Meter Type: DualView™ Power Output Meter — two mechanical meters stacked to show real-time output for both amp sections
  • Illumination: Direct LED backlighting for the meters and front panel; signal tubes can be illuminated green or natural amber
  • Handles: Built-in aluminum handles to assist with the unit's substantial weight
  • Visuals: Features the classic "Large Form Factor" McIntosh aesthetic while integrating modern hybrid technology
  • Manufacturing: Hand-built in Binghamton, New York

3 Years Limited Manufacturer Warranty

Scope and Duration of Warranty

Subject to the terms and conditions stated below, McIntosh Laboratory, Inc. (“McIntosh”) warrants to the original owner that this Product shall be free from defects in workmanship or materials for a term of three (3) years from the date when it was purchased from an Authorized McIntosh Dealer. Provided, however, that rather than the three (3) years of coverage afforded the Product generally, where applicable, vacuum tubes contained in our Products are warranted for 90 days from the date of purchase, hard disc drives and projector lamps contained in our Products are warranted for one (1) year from the date of purchase. Provided, further, that where required by state law applicable at the time of purchase, instead of commencing on the date of purchase the foregoing warranties shall commence on the date specified in such law.

Click Here To View Mcintosh Warranty Info

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