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McIntosh's MC451 Dual Mono Amplifier is the solution to bi-amping a loudspeaker. The MC451 is much more compact in size than its predecessors, enabling it to easily fit into home audio systems and racks.
Peter Tyson Warranty Information
All the information below is valid for purchases made on or after 01/01/2022. For purchases made before this date, the warranty details will be provided on your sales receipt or can be obtained by getting in touch with our Customer Service Department.
Please note: Our free extended warranties are only available for brand new products purchased directly from our website. Any purchase made through any other selling platforms will be subject to the Standard Warranty Period only.
The list below indicates the standard warranty period supplied by each manufacturer along with which products are covered by our free 5 Year extended warranty. In the event of a claim, Peter Tyson provides and administers the extended warranty. This extended warranty is on the same basis and terms as the manufacturer’s original warranty, where possible using the same official service providers, giving you total peace of mind for the extended warranty period. In the event of a claim, please contact Peter Tyson in the first instance. Claims for work done by others won't be accepted unless previously agreed.
Please note: We may run promotions and offer longer warranties than advertised below. These will be detailed on the individual product pages and will also be visible on your order invoice.
Should you wish to contact the manufacturer direct for any reason, we have also provided this information within the associated brand sections.
Any extended warranties offered by Peter Tyson are free. We do not include any form of insurance terms such as accidental damage or loan equipment cover.
Warranties can only be fulfilled to goods purchased and delivered within the UK. In order for us to conduct a Warranty claim for goods taken outside of the UK, the goods will have to be returned at your own expense. Alternatively, you can make the goods available for collection at a UK address. This also applies to goods delivered to shipping companies. Subsequent to a successful warranty claim, goods can only be re-delivered to a UK address.
Free warranties provided for TVs, are provided by the Manufacturer/Supplier, and are bound by their own individual terms and conditions. If you need further clarification, please contact us.
All Peter Tyson Extended Warranties are only valid for the original purchaser and are not transferable.
If you have a fault with a product, please click here to see our Service and Returns Policy or click here to contact our Customer Service Department.
Delivery Information
Click here to see delivery information for televisions and larger floorstanding speakers.
At Peter Tyson we pride ourselves on prompt, efficient delivery. Please note that the daily cut off time for all next day delivery services is 3pm.
As standard, items are dispatched on a next working day service. If ordered before 3pm, your goods will be dispatched the same day. This is subject to stock availability and excludes weekends. For an additional fee, early weekday delivery options are available. These options are presented at checkout. See below for further delivery options.
Orders placed before 3pm on a Friday will be delivered the following Monday, unless you have selected a weekend delivery option. Orders placed after 3pm on a Friday will be despatched the following Monday.
Next day deliveries are applicable to the UK mainland and are free of charge unless stated. Orders under £100 will carry a £5.00 next working day deliver surcharge. We do not deliver our goods outside of the UK.
Unfortunately, due to their fragile nature, we cannot accept TV orders for delivery to none UK mainland postcodes - see the list of excluded remote and off-shore postcodes below. All other items to these regions carry courier imposed surcharges of £20 for the first two items, plus £8.50 per additional item* and are subject to a 2-3 working day delivery service.
To ensure reliable, undamaged delivery of televisions - TVs will be shipped with Fedex and for larger TVs, our 2 man delivery service with BJS rather than with our standard next working day courier.
*Where possible, if additional cables or selected small accessories are ordered along with a main product over £100, we will always try to send the additional cables at no extra charge.
Saturday & Sunday Service: Please Note DPD only collect from us on weekdays (Mon - Fri) - We are unable to dispatch orders on Saturday or Sunday.
The order cut-off time for weekend deliveries is Friday 3pm.
If you have urgent or specific delivery needs, please contact us before ordering.
ORDERS UNDER £100
Orders under the value of £100 will be dispatched on a Next Working Day service via DPD with a £5.00 delivery surcharge.
ORDERS OF £100 AND OVER
Dispatched via DPD on a next working day delivery service. You can upgrade to a time or weekend delivery - see below for details.
*Remote & Offshore Locations Exempt
UPGRADED DELIVERY
Before 12:30pm - Next Working Day Delivery
per order £15.00
NB: Remote & Offshore Locations Exempt.
Before 10:30am - Next Working Day Delivery
per order £20.00
NB: Remote & Offshore Locations Exempt.
Saturday and Sunday Delivery
per order £15.00
NB: Remote & Offshore Locations Exempt.
Television, Appliances, and Larger Speaker Deliveries
Please note: Large TV, large appliances, and larger floorstanding speaker deliveries are not available to Northern Ireland, Republic of Ireland, Isle of Man, Isle of Wight, Scottish Islands, and Channel Islands.
BJS - Two-man delivery for large TVs and Appliances
Our larger TVs and large appliances (excluding American Fridge Freezers) are delivered by our two-man, white glove specialist courier to your door - BJS Two-Man.
Your consignment will be sent on a 2 day delivery service (for orders placed before 3pm, Monday to Friday). Deliveries are made via BJS Two-Man between the hours of 07:00 and 21:00, and are delivered to your door only (ground floor deliveries only).
Upon Despatch, BJS Home Distribution will contact you via email or text to confirm the date and day of delivery. You will receive an automatic 3 hour time slot the night before delivery. The driver will call you 30 minutes to 1 hour prior to arriving on the day of delivery.
Upon delivery, please ensure all packing of items are carefully checked before signing. All damages need to be reported to Peter Tyson within 2 working days of delivery. Once a delivery has been confirmed, if it is then cancelled or if nobody is there to take delivery, additional charges may apply for re-delivery.
Deliveries are Monday to Friday only, UK mainland regions only. TVs are dispatched free of charge to UK Mainland postcodes (see below for exclusions) and Large Appliances are charged at £35 per item with BJS.
Please note: We only offer our standard BJS delivery service to ground floor properties and blocks of flats with a working lift that is large enough and has sufficient weight capacity to accommodate the ordered goods. Our ground floor room of choice deliveries can include a maximum of 2 flights of stairs where a lift is not available. Any items which are 85kg or over, will be delivered to ground floor only. Please call us if this affects your order, as undelivered products caused by this problem, will incur a redelivery charge.
Fedex - Free 2 weekday delivery
Generally, television purchases of 50" and below will be transported via Fedex, although there may be some exceptions. All items sent out with Fedex (for orders placed before 3pm) are on a 2 working day service or with the chargeable upgrade to a next working day service for £20 per order. Next working day and 2 working day deliveries are Monday to Friday only. A Saturday service is available for orders placed before 3pm on Friday, charged at £30 (plus £20 per additional item) and will be presented as an option at the checkout.
Fedex will send you tracking information via email which can be tracked online.
Palletforce - 2 weekday pallet service for American Fridge Freezers
Due to their size, American Fridge Freezers are sent with Palletforce on a 2 working day, kerbside delivery service. Delivery is only available from Monday to Friday (there is no weekend delivery option), and the order cut-off time for same day dispatch is 3pm on Monday to Friday (subject to stock). Palletforce deliveries are limited to UK Mainland postcodes only (see Restricted Postcodes below), and delivery is charged at £80.
Appliance Delivery Information
Below you will find the delivery information regarding appliance size/type and geographical location.
Large Appliances - (Washing Machines, Dishwashers, Fridge Freezers etc).
Free Local Delivery Service (Cumbria, SW Scotland and NE England*) 2-3 working days.
Within our free delivery service, we will deliver the product to a valid address and we will carry the product into a room of the customer’s choice providing it is straightforward and feasible safe for us to do so. Our delivery engineers reserve the right to refuse delivery to a particular room if it is not straight forward. In these instances, we will leave the product in a convenient place.
Also, in addition to delivery to these local postcodes we can offer an Installation and Recycling service (Selectable at the Checkout) these are charged at £39.99 for Standard Installation and an additional £20 for Recycling.
Our Installation service:
✓ Disconnect the existing appliance ✓ Un-box the new product and remove the transit bolts ✓ Connect your appliance to a suitable water supply within 1.5 metres of your product and an electrical socket ✓ Connect the waste hose to suitable spigot, down pipe and existing waste connections ✓ Level the appliance and check that it’s fully working and operational ✓ Take the packaging from your new appliance away. If you add recycling to your order, we will also take your old appliance away for recycling
Our Installation Service only includes connecting to existing points and fixings. This does not include installing or moving plumbing, connection points or electrics. Installing new points or moving existing points is the customer’s responsibility we can recommend local tradesmen however this will be at the customer’s expense and we not accept any liability for their work.
Unfortunately, our Installation Service excludes all gas appliances. It is the customer’s responsibility to find a gas safe engineer to connect the appliance. Any work conducted by a third part gas safe engineer will be at the customer’s expense and we will not accept any liability for their work.
We do provide installation options for built-in appliances providing it is simply a case of fitting the appliance and furniture doors. Any additional work to the kitchen units or carpentry work required will need to be completed at the customer’s expense.
In the vast majority of cases we will not be able to install the cabinet doors to built-in laundry products as the fittings very rarely match up. We will try our best however if we are unable to do this we will still install connect to plumbing and put the appliance in situ.
Our Installation prices do not include installation of commercial appliances or installation within commercial premises. These services are available but would be subject to site survey and prices would need to be calculated and quoted accordingly.
We reserve the right to refuse installation should our engineers think that the existing electrical or plumbing points are unsafe and in need of maintenance or if they are unable to install to existing furniture.
If you have urgent or specific delivery needs, please contact us before ordering.
All Delivery times are subject to stock availability.
The following postcodes have further courier restrictions and are only available on a 2 to 3 working day service at a charge of £20 for the first two items, and an extra £8.50 per additional item. These are also the excluded postcode regions for television deliveries.
TR21, TR22, TR23, TR24, TR25
ZE1, ZE2, ZE3
ZZ71, ZZ75
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• Includes McIntosh's 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 Metre
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 McIntosh's 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.
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 their 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 optimise 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 their DualView™ Power Output Metre. The DualView metre features two of McIntosh's traditional, fast responding mechanical meters stacked above and below each other in a single metre window; one metre is dedicated to the 150 Watt vacuum tube amp and the other to the 300 Watt solid state amp. Each metre 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 McIntosh's 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.
• Their 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.
• McIntosh's Power Management System that will turn the entire unit off after a set amount of time when no input signal has been detected.
The uncompromising fit and finish of the MC451 is highlighted by familiar McIntosh design cues. The front features a signature black glass faceplate with three clear windows that allow viewing of the vacuum tubes, the DualView metre, two rotary control knobs, an illuminated logo and lettering, and built-in aluminium handles. The top is highlighted by a series of block diagrams printed on glass inserts outlining the circuitry and specifications of the unit. All of this sits atop of stainless steel chassis that's been polished to a pristine mirror finish.
The MC451 amplifier can be combined with a variety of preamplifiers, turntables, CD players, media streamers, speakers, and other specialty products to form a complete home audio system designed for bi-amping loudspeakers.
MC451
Electronic
Power Output per Channel
Solid State section: 300 Watts @ 2, 4 or 8 Ohms
Vacuum Tube section: 150 Watts @ 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 20,000Hz
S/N below rated output
Solid State section: 118dB
Vacuum Tube section: 112dB
Rated Power Band
Solid State section: 20Hz to 20kHz
Vacuum Tube section: 20Hz to 20kHz
Dynamic Headroom
Solid State section: 2.5dB
Vacuum Tube section: 1.2dB
Frequency Response
Solid State section:
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Vacuum Tube section:
+0, -0.5dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 70,000Hz
Total Harmonic Distortion
Solid State section: 0.005% maximum harmonic distortion at any power level from 250 milliwatts to rated power, 20Hz to 20,000Hz
Vacuum Tube section: 0.5% maximum harmonic distortion at any power level from 250 milliwatts to rated power, 20Hz to 20,000Hz
Damping Factor
Solid State section: >40
Vacuum Tube section: >18
Control
Remote Power Control
Yes
Multi-Channel DB25 Cable
N/A
Connectivity
Speaker Binding Post Type
Patented Solid Cinch™ Speaker Binding Posts
General
Circuit Configuration
Solid State section: Push-Pull Complementary
Vacuum Tube section: Unity Coupled