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Summary of Contents for McIntosh MC451
- Page 1 McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 www.mcintoshlabs.com MC451 Dual Mono Power Amplifier Owner’s Manual...
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Page 2: Table Of Contents
Safety First �� �� �� �� �� �� �� �� �� �� �� �� �� �� �� 2 You have invested in a precision instrument that The MC451 has 150 watts of vacuum tube power to drive your loudspeaker’s mid ranges and tweeters. -
Page 3: Where To Put It
Dimensions The MC451 is very heavy� When moving the The following dimensions can assist in determining the best location for your MC451. unit, have enough help to lift the MC451. This will ensure the safety of both you and the MC451. -
Page 4: Removal Of Foam Insert Over Vacuum Tubes
The foam insert must be removed from the MC451 before connecting AC Power� Failure to do so is a fire hazard, and can result in damage to the MC451 and the surrounding environment� To remove the foam insert, it is necessary to temporarily remove the tube cover. -
Page 5: Connecting A Loudspeaker
The smaller the gauge number, the larger the wire size. Loudspeaker Cable Wire Gauge Guide 3/10 in 11/64 in Cable Distance Ø 5. Place the McIntosh wrench over the top of the 7.6 mm 4.4 mm Loudspeaker 25 feet 50 feet 100 feet... -
Page 6: Front Panel Displays And Knobs
In the unlikely event of a fault in the MC451’s • ON- the MC451 will be powered on main power supply, the MC451 will power off regardless of any power control connection. - Page 7 Front Panel Displays and Knobs...
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Page 8: Rear Panel Connections And Switches
Note: If you need to switch the INPUT or AMPLIFIER 10� AC Input MODE, it is best to do so when the MC451 is POWER CONTROL OUT will provide a +12 Connect the MC451 power cord to a live AC powered off to avoid any unpleasant noise from the volt signal with a total current up to 25 mA. - Page 9 M C 4 5 1 D U A L M O N O P O W E R A M P L I F I E R RISK OF ELECTRIC SHOCK DO NOT OPEN SERIAL DISABLED McINTOSH LABORATORY, INC., BINGHAMTON, NY NUMBER HANDCRAFTED IN USA WITH US AND IMPORTED PARTS...
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Page 10: Connection Diagram
M C 4 5 1 D U A L M O N O P O W E R A M P L I F I E R RISK OF ELECTRIC SHOCK SERIAL DO NOT OPEN DISABLED McINTOSH LABORATORY, INC., BINGHAMTON, NY NUMBER HANDCRAFTED IN USA WITH US AND IMPORTED PARTS MID / HIGH MID / HIGH... - Page 11 Connection Diagram REMOVE REMOVE Any jumpers between the low and mid/high sections of the loudspeakers MUST be removed prior to connecting the MC451. VACUUM TUBE INPUT MODE INPUT BALANCED UNBALANCED UNBAL CROSSOVER (MONO MODE) CROSSOVER POINT VACUUM TUBE LEVEL +1.2...
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Page 12: Setting Up The Crossover
Setting Up the Crossover The MC451’s crossover tailors the output The VACUUM TUBE LEVEL knob allows gain CROSSOVER frequency range of each amplifier section to the adjustments to be made to the vacuum tube ampli- (MONO MODE) attached loudspeaker. Set the CROSSOVER POINT fier. - Page 13 Setting Up the Crossover This graph demonstrates the combined frequency response for a 1kHz crossover point and 0dB level difference. Other crossover points will have similar curves. Combined (Full Range) Response Crossover Point (1kHz) Solid State Vacuum Tube (High Pass) Response (Low Pass) Response Frequency (Hz)
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Page 14: Solid State Specifications
+0, -3.0dB from 10Hz to 70,000Hz Standby, less than 0.5 watt Total Harmonic Distortion Total Harmonic Distortion Refer to the rear panel of the MC451 for the 0.005% maximum harmonic distortion at any power 0.5% maximum harmonic distortion at any power correct voltage. -
Page 15: Packing Instructions
If a shipping carton or any of the interior part(s) are needed, please call or write Customer Service Department of McIntosh Laboratory. Refer to page 2. Please see the Packaging Parts List for the correct part numbers. - Page 16 McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, NY 13903 www.mcintoshlabs.com The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated who reserve the right to improve design without notice. Printed in the U.S.A. McIntosh Part No. 24118600...
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