McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 FAX: 607-724-0549 Thank You, Please Take A Moment, Customer Service and Table of Contents
Thank You Table of Contents For your decision to own this McIntosh MA6450 Inte- Thank You .......................................................................... 2 grated Amplifier ranks you at the very top among discrimi- Please Take a Moment ....................................................... 2 nating music listeners. You now have The Best. The Customer Service ............................................................... 2 McIntosh dedication to Quality, is assurance that you Table of Contents ............................................................... 2 will receive many years of musical enjoyment from this Safety Instructions ............................................................. 3 unit. Introduction ........................................................................ 4 Please take a short time to read the information in this Performance Features ........................................................ 4 manual. We want you to be as familiar as possible with all Installation ......................................................................... 5 the features and functions of your new McIntosh MA6450. Rear Panel Connections ..................................................... 6 This will ensure that you receive all the performance ben- How to Connect ................................................................. 7 efits this equipment can offer you, and that it will become a How to Connect for Video Switching ................................ 8 highly valued part of your home entertainment system. Front Panel Controls, Displays, Push-Buttons, and Switches ...................................................................... 9 Please Take A Moment How to Operate ................................................................ 10 The serial number, purchase date and McIntosh dealer name HR-033 Push-Buttons ...................................................... 12 are important to you for possible insurance claim or future How to Operate by Remote Control ................................ 13 service. The serial number is located on the rear panel of the Specifications .................................................................. 14 equipment. The spaces below have been provided for you to Packing Instruction .......................................................... 15 record that information:
Serial Number: NOTES: 1. Connecting Cables are available from the McIntosh Parts Department: Purchase Date: Data and Power Control Cable Part No. 170-202 Six foot, shielded 2 conductor, with 1/8 inch stereo mini phone plugs on each end. Dealer Name: 2. For additional connection information, refer to the owners manual(s) for any component(s) connected to the MA6450 Amplifier. Customer Service 3. There is a built-in turn on delay which will mute the speaker If at any time you have questions about your McIntosh outputs for approximately two seconds when the amplifier is MA6450 Intergrated Amplifier, contact your McIntosh turned on. dealer. Your dealer is familiar with your McIntosh equip- 4. If the rear panel processor switch is set to the in position, and ment as well as other brands that may be included in your a signal processor is not connected, no sound will be heard through the system. When a signal processor is connected to system and is best qualified to help you. the MA6450 processor jacks, and the processor switch is set to the in position, the processor must be on and operating, or If it is determined that your MA6450 is in need of repair, in bypass mode, for a sound to be heard through the system. you can return it to your dealer or you can return it to 5. It is very important that loudspeaker cables of adequate size McIntosh Laboratory. Contact the McIntosh Repair Depart- be used in your music system, to ensure that there will be no ment for assistance at, power loss or heating. Cable size is specified in Gauge numbers or AWG, (American Wire Gauge). The smaller the McIntosh Laboratory, Inc. Gauge number, the larger the wire size: 2 Chambers Street If your loudspeaker cables are 25 feet (7.62m) or less, Binghamton, New York 13903 use at least 18 Gauge (AWG) wire size or larger. If your loudspeaker cables are 50 feet (38.1m) or less, Phone: 607-723-3512 use at least 16 Gauge (AWG) wire size or larger. FAX: 607-724-0549 If your loudspeaker cables are 100 feet (76.2m) or less, use at least 14 Gauge (AWG) wire size or larger. Copyright 1997 ã by McIntosh Laboratory, Inc.
2 Safety Instructions
IMPORTANT SAFETY 8. Do not use attachments not recommended in this INSTRUCTIONS! owners manual as they may cause hazards.
PLEASE READ THEM BEFORE Installation: OPERATING THIS EQUIPMENT. 9. Locate the equipment for proper ventilation. For ex- ample, the equipment should not be placed on a bed, sofa, rug, or similar surface that may block ventilation WARNING SHOCK HAZARD - openings; or, placed in a built-in installation, such as a DO NOT OPEN. bookcase or cabinet, that may impede the flow of air AVIS RISQUE DE CHOC - through the ventilation openings. NE PAS OUVRIR. 10. Locate the equipment away from heat sources such as radiators, heat registers, stoves, or other appliance (in- cluding amplifiers) that produce heat. 11. Mount the equipment in a wall or cabinet only as de- NO USER-SERVICEABLE scribed in this owners manual PARTS INSIDE. REFER 12. Do not use this equipment near water; for example, SERVICING TO near a bathtub, washbowl, kitchen sink, laundry tub, in QUALIFIED PERSONNEL a wet basement or near a swimming pool, etc. 13. Do not place this product on an unstable cart, stand, tripod, bracket, or table. The equipment may fall, caus- General: ing serious injury to a person, and serious damage to 1. Read all the safety and operating instructions, contained the product. in this owners manual, before operating this equipment. 2. Retain this owners manual for future reference about Connection: safety and operating instructions. 14. Connect this equipment only to the type of AC power 3. Adhere to all warnings and operating instructions. source as marked on the unit. 4. Follow all operating and use instructions. 15. Route AC power cords so that they are not likely to be 5. Warning: To reduce risk of fire or electrical shock, walked on or pinched by items placed upon or against do not expose this equipment to rain or moisture. them, paying particular attention to cords at plugs, con- This unit is capable of producing high sound pressure venience receptacles, and the point where they exit from levels. Continued exposure to high sound pressure the instrument. levels can cause permanent hearing impairment or 16. Do not defeat the inherent design features of the polar- loss. User caution is advised and ear protection is ized plug. Non-polarized line cord adapters will defeat recommended when playing at high volumes. the safety provided by the polarized AC plug. If the 6. Caution: to prevent electrical shock do not use this plug should fail to fit, contact your electrician to re- (polarized) plug with an extension cord, receptacle or place your obsolete outlet. Do not defeat the safety pur- other outlet unless the blades can be fully inserted to pose of the grounding-type plug. prevent blade exposure. 17. Do not overload wall outlets, extension cords or inte- Attention: pour pevenir les chocs elecriques pas gral convenience receptacles as this can result in a risk utiliser cette fiche polarisee avec un prolongateur, une of fire or electric shock. prise de courant ou un autre sortie de courant, sauf si les lames peuvent etre inserees afond ans en laisser aucune partie a decouvert. Care of Equipment: 7. For added protection for this product during a lightning 18. Clean the instrument by dusting with a dry cloth. Un- storm, or when it is left unattended and unused for long plug this equipment from the wall outlet and clean the periods of time, unplug it from the wall outlet and dis- panel with a cloth moistened with a window cleaner. Do connect the antenna or cable system. This will prevent not use liquid cleaners or aerosol cleaners. damage to the product due to lightning or power line 19. Do not permit objects of any kind to be pushed and/or surges. fall into the equipment through enclosure openings.
3 Safety Instructions cont, Introduction and Performance Features
Never spill liquids into the equipment through enclo- Performance Features sure openings. · 100 Watt per Channel Integrated Amplifier 20. Unplug the power cord from the AC power outlet when The MA6450 combines 100 watt per channel power ampli- left unused for a long period of time. fier with a sophisticated control center in one compact unit. Repair of Equipment: 21. Unplug this equipment from the wall outlet and refer · Multiple Inputs servicing to a qualified service personnel under the fol- Seven high level inputs provide for all popular program lowing conditions: sources. A. The AC power cord or the plug has been damaged. B. Objects have fallen, or liquid has been spilled into · Tone Control Bypass the equipment. At the flat settings the Bass and Treble control circuit ele- C. The equipment has been exposed to rain or water. ments are removed from the Listen signal path. D. The equipment does not operate normally by follow- ing the operating instructions contained within this · Active Loudness Circuity owners manual. Adjust only those controls that are A continuously variable active Loudness control allows covered by the operating instructions, as an im- any degree of loudness compensation. All Loudness circuit proper adjustment of other controls may result in elements are removed from the signal path in the flat set- damage and will often require extensive work by a ting. qualified technician to restore the product to its nor- mal operation. E. The equipment has been dropped or damaged in any · Electronic Input Switching way. Digital Logic integrated circuits drive Electromagnetic F. The equipment exhibits a distinct change in perfor- switches on all inputs and operating functions for reliable, mance - this indicates a need for service. noiseless, distortion free switching 22. Do not attempt to service beyond that described in the operating instructions. All other service should be re- · Illuminated Peak Responding Output Meters ferred to qualified service personnel. Output meters respond to 95% of full scale reading with a 23. When replacement parts are required, be sure the ser- single cycle of a 2KHz tone burst to indicate output power vice technician has used replacement parts specified by with high accuracy. McIntosh or have the same characteristics as the origi- nal part. Unauthorized substitutions may result in fire, · Power Guard with Sentry Monitor electric shock, or other hazards. Patented McIntosh Power Guard circuit that prevents the 24. Upon completion of any service or repairs to this prod- amplifier from being overdriven into clipping with its harsh uct, ask the service technician to perform safety checks distorted sound that can also damage your valuable loud- to determine that the product is in proper operating con- speakers. Sentry Monitor power output stage protection dition. circuits ensure the MA6450 will have a long and trouble free operating life.
Introduction · Speaker Switching The remote controlled MA6450 is a sophisticated, yet easy Front panel Speakers push-buttons control two pairs of to operate Integrated Amplifier that will provide the supe- speakers. rior fidelity music reproduction that is traditional from McIntosh. It includes a wide range of convenient operating · Special Power Supply functions to enhance your listening enjoyment. The classic Fully regulated power supply with a shielded power trans- McIntosh MA6450 will perfectly complement a pair of former ensures stable noise free operation. McIntosh Loudspeakers for a stereo system of incompa- rable performance and style.
4 Installation
Installation The MA6450 can be placed upright on a table or shelf, nite asset in maintaining all the system components at the standing on its four feet. It also can be custom installed in a coolest possible operating temperature. piece of furniture or cabinet of your choice. The required A custom cabinet installation should provide the follow- panel cutout, ventilation cutout and unit dimensions are ing minimum spacing dimensions for cool operation. Allow shown. at least 2 inches (5.1cm) above the top and 1 inch (2.54 Always provide adequate ventilation for your MA6450. cm) on each side of the amplifier, so that airflow is not ob- Cool operation ensures the longest possible operating life structed. 21 inches (53.3cm) depth behind the mounting for any electronic instrument. Do not install the MA6450 panel, which includes clearance for connectors. Allow 1-1/ directly above a heat generating component such as a high 8 inches (2.9cm) in front of the mounting panel for knob powered amplifier. If all the components are installed in a clearance. Be sure to cut out a ventilation hole in the single cabinet, a quiet running ventilation fan can be a defi- mounting shelf according to the dimensions in the drawing.
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5 MA6450 Rear Panel Connections
MA6450 Rear Panel Connections
SUM Data port MAIN OUTPUTS send signals to power amplifier PROCESSOR FROM TAPE 1, and allows connection inputs, POWER AMP IN jacks accept signals from and TO jacks along TAPE 2 inputs of a McIntosh Re- an external preamplifier or signal source, EXT-INT with PROCESSOR are for tape mote Control PWR AMP INPUT switch disconnects the power IN-OUT switch for an recorders Translator amplifier from the built-in preamplifier external signal proces- sor
DATA PORTS send signals RECORD TAPE 1 High Level Inputs to compatible source com- and 2 OUTPUTS accept signals from ponents to allow you to supply record signals the output of a remotely control them for tape recorders TUNER, CD 1&2, and AUX
Fuse holder, refer to infromation on the back POWER CONTROL panel to deter- Output sends a turn-on mine the cor- SWITCHED signal to a McIntosh rect fuse size outlet turns on VIDEO, inputs for Component and rating. and off with the audio signals from a MA6450 main LD, VCR, TV or the power switch optional MVS-3 A/V Selector Connect the MA6450 power cord to a live AC SPEAKERS 1 and outlet. Refer to SPEAKERS 2 allow information on the two pairs of speakers back panel to de- to be connected termine the cor- rect voltage. The EXT (external) UNSWITCHED Sensor for a McIntosh outlet stays on all IR sensor the time
6 How to Connect the MA6450
How to Connect the MA6450 the Power Control In on a McIntosh component or 1. Connect the MA6450 power cord to a live AC outlet. Power Controller. 2. Connect cables from a pair of speakers to the 6. Connect a cable(s) from the DATA PORTS to the com- SPEAKER 1 Outputs. ponents that are to be controlled by the MA6450. Note: After connecting the 7. Connect a Coax cable from the EXT SENSOR to a loudspeakers, install the McIntosh wall sensor or WK-2 Keypad in a second supplied protective covers room. (located in an accessory package in the shipping NOTE: If a Signal Processor is Used, connect cables from the carton) over the loudspeaker Signal Processor Outputs to the PROCESSOR FROM terminals. jacks and the Signal Processor Inputs to the 3. Connect a cable from the TAPE 1 OUTPUTS to the PROCESSOR TO jacks. Set the MA6450 PROCESSOR Record Inputs of a tape recorder and the TAPE 1 IN- switch to IN. The processor must be on or in bypass PUTS to a tape recorder Outputs. mode for a signal to be heard. 4. Connect cables from a McIntosh CD Player to the CD1 INPUTS. Connect a McIntosh tuner to the TUNER IN- McIntosh CD Player PUTS. 5. Connect a cable from the POWER CONTROL jack to
Right Loudspeaker Left Loudspeaker Right Loudspeaker Left Loudspeaker McIntosh PC-3
7 How to Connect the MA6450 for Video Switching
How to Connect the MA6450 for Video Switching 1. Connect the MVS-3 power cord to the Switched outlet. MVS-3 LV AUDIO INPUTS, the video output to the 2. Connect a Data cable from the MA6450 VIDEO DATA MVS-3 LV VIDEO INPUT and the DATA OUT to the PORT to the MVS-3 DATA IN jack. MVS-3 LV DATA PORT. 3. Connect the MVS-3 CONTROL CENTER OUTPUTS 6. Connect other video source components to the appro- to the MA6450 VIDEO Inputs. priate audio and video inputs on the MVS-3. 4. Connect the MVS-3 VIDEO MONITOR OUTPUT to a TV or Monitor. 5. Connect a McIntosh LD Player audio outputs to the
To AC Outlet
McIntosh MVS-3 A/V Selector Monitor
McIntosh LD Player
8 MA6450 Front Panel Controls, Display, Push-Buttons and Switches
MA6450 Front Panel Controls, Display, Push- Buttons and Switches
METERS indicate power output of the amplifier
TREBLE control provide POWER GUARD LEDs light VOLUME control allows 12dB boost or cut with a when the amplifier channel you to adjust the listening flat center position. Power Guard Circuit activates level at the output(s)
Input switch selects Muting LED which of the five input lights to indicate sources will appear at muting is active the outputs
BASS control provide Select tape MONO push- POWER ON/OFF 12dB boost or cut with playback button combines push-button turns a flat center position. from either the left and right the MA6450 ON, or of two tape channel signals OFF (Standby) recorders for Mono opera- tion at the Main and speaker out- LOUDNESS control puts (smaller inner knob) provides adjustable fre- quency response con- toured to compensate IR (Infra Red) sensor ac- Copy tapes from SPEAKERS 1 and 2 for the behavior of the cepts IR signals directly either of two tape push-buttons select one human ear at softer lis- from an HR033 Remote recorders to the pair of speakers, or both tening levels. Control other pairs simultaneously The BALANCE control (large outer knob) al- lows you to adjust the relative volume balance between channels.
9 How to Operate the MA6450
How to Operate the MA6450 Power On Press the POWER push-button to turn the MA6450 on tion. All tone control circuit elements are removed from the and off. signal path when the controls are in the center or flat posi- Note: The red LED above the push-button stays on tion. whenever the MA6450 power cord is connected to a live outlet. You may also turn the MA6450 on and off Loudness Control using the HR033 Remote Control. After first setting the desired listening volume, rotate the LOUDNESS control clockwise to increase the intensity of NOTE: You may also turn on the MA6450 using the HR033 the bass according to your listening preference. When the Remote Control. LOUDNESS control is in the fully counter clockwise or flat position, all loudness circuit elements are removed Source Selection from the signal path. Select the desired listening source with the Input Switch. Mono Tape Mon 1 and 2 Press the MONO push-button to combine left and right ste- Press a TAPE MON (Tape Monitor) push-button to play- reo signals to mono at MAIN OUTPUT and SPEAKERS 1 back a previously recorded tape or monitor a tape playback and 2. during the recording process.
NOTE: The TAPE MON push-buttons are electronically Mute interlocked so only one recorder playback can be Press MUTE on the Remote Control to mute audio in the selected at a time. If a 3 head tape recorder is being MAIN OUTPUT and SPEAKERS 1 and 2. Press again, used, you can monitor the tape playback during the select another Input or press a Tape Mon push-button to recording process by pressing the appropriate TAPE unmute. MON push-button. NOTE: When the MA6450 is in Mute, the Speakers push- Volume Control buttons, Mono push-button and Tape Copy push-buttons Adjust the VOLUME control for the desired listening are inoperative. level.
Balance Control Adjust the BALANCE control as needed to achieve approximately equal listening volume levels in each loudspeaker. Turn the BAL- ANCE to the Left to emphasize the left channel by reducing the level of the right channel. Turn the BALANCE to the right to emphasize the right channel by reducing the level of the left channel.
Bass and Treble Controls Adjust the BASS and TREBLE controls to suit your listening preferences. The bass or treble intensity can be increased with clockwise rota- tion and decreased with counterclockwise rota-
Figure 1
10 How to Operate the MA6450 cont
Speakers 1 and 2 How to Read the Power Output Meters Press SPEAKERS 1 or 2 push-buttons to switch the two The MA6450 Power Output Meter scales are based on us- pairs of speakers on or off. You can press either push-but- ing 4 ohm loudspeakers. The meters are peak responding ton individually, or both together. and indicate the power output of each channel with high accuracy when the amplifier is reproducing music. The Reset of Microprocessors power outputs for the meter scale indications between the In the event that the controls of the MA6450 stop function- numerical markings (high lighted in gray) are shown be- ing, remove the MA6450 power cord from the AC outlet. low. Wait approximately two minutes and then replace the power cord in the outlet. This will reset the MA6450 mi- croprocessors and the amplifier should be functioning nor- mally.
NOTE: The above condition is usually caused by either interruptions in AC power and/or major changes in voltage.
How to Make a Tape Recording Select the desired input source to be recorded with the In- 6phyÃQr put selector switch. This signal will appear at both Tape HrrÃSrhqvt Outputs 1 and 2 and allow either or both machines to P
record the selected signal. The selected signal source will ÃXh also be available at the main outputs and both pairs of speaker outputs. To play back the recording, press a TAPE #ÃXh MON push-button. Refer to Figure 1. !ÃXh NOTE: If a 3 head tape recorder is being used, you can monitor the tape playback during the recording process by ÃXh pressing the appropriate TAPE MON push-button. #ÃXh
How To Make an Audio Tape Copy !ÃXh Press the TAPE COPY 1-2 push-button to copy tapes from Tape Recorder 1 in playback mode to tape recorder 2 in ÃXh record mode. Press TAPE COPY 2-1 to copy tapes from Tape Recorder 2 in playback mode to Tape Recorder 1 in #ÃXh record mode. During the tape copy process, you can listen to tape playback by pressing a TAPE MON push-button. !ÃXh
Refer to Figure 1. ÃXh
NOTE: You can also listen to any other signal source while #ÃXh copying a tape. !ÃXh
ÃXh
#ÃXh
11 HR033 Push-Buttons
HR033 Push-Buttons
Select any of the five high level audio sources
Selects Tape Monitor 1 or 2 Selects any one of five externaly switched Audio/ Use to select tuner Video Program Sources presets or any num- bered operation. Select AM tuner Select FM tuner operating functions operating func- tions. Selects tuner sta- tions presets and Tunes to the next certain McIntosh radio station. CD Players. Select CD player, CD changer or tape recorder functions. Press to turn off the MA6450 Select two pairs of speakers
Press to turn the MA6450 ON or OFF Mutes the audio
Adjusts the volume level up or down Turns power ON to a component connected via the Data Port.
Note: The HR033 Remote Control push-buttons that are shown in black only work with other McIntosh Products.
12 How to Operate the HR033
How to Operate HR033 Mute Speaker Selection Press MUTE to mute the audio signals at the MAIN OUT- Press SPKR 1 or SPKR 2 push-buttons to switch two pairs PUTS and SPEAKERS. The MUTE LED, to the right of of speakers on and off separately or together. the volume control will turn onto indicate that Mute is ac- tive. Press MUTE a second time to unmute audio Acc On Press ACC ON to turn power ON of a McIntosh LV or Mono DVD Disc Player. Press the MONO push-button to combine left and right ste- reo signals to mono at the MAIN OUTPUT and SPEAK- NOTE: When other brands of components are connected with a ERS McIntosh Remote Control Translator (RCT), refer to the RCT Owners Manual for further information on alternate HR033 push-button functions. Audio Press any of the five Audio push-buttons to select a pro- gram source.
Video/Audio Selection When the optional McIntosh MVS-3 Audio/Video Selector is added, first press VIDEO, and then the desired push-but- ton to select any of the five A/V sources connected to the MVS-3.
CD/Tape Use these push-buttons to operate a CD player, CD changer or tape recorder, when the component is connected to the MA6450 with a McIntosh RCT Translator.
Numbered Push-buttons Press push-buttons 0 through 9 to access tuner station pre- sets or CD tracks/discs.
Tuner Push-buttons Use with a McIntosh tuner. Select AM or FM broadcast band. Press and release SEEK Up or Down to move from station to station. Press and hold a SEEK push-button to move continuously from station to station. Press REVIEW to start the automatic brief audition of each of the presets stored in the tuner memory. Press REVIEW a second time to stop on a station preset and exit the Review process.
Volume Press the Up or Down VOLUME push-button to raise or lower the listening volume level.
NOTE: The Tape Record Outputs are not affected.
13 Specifications
Specifications Power Output Per Channel Power Requirements 100 watts into 4 ohm loads minimum sine wave continuous 100 Volts, 50/60Hz at 3.6 amps average power output per channel both channels operating. 110 Volts, 50/60Hz at 3.6 amps 120 Volts, 50/60Hz at 3.6 amps Output Load Impedance 220 Volts, 50/60Hz at 1.8 amps 4 ohms 230 Volts, 50/60Hz at 1.8 amps 240 Volts, 50/60Hz at 1.8 amps Rated Power Band 20Hz to 20,000Hz NOTE: Refer to the rear panel of the MA6450 for the correct voltage Dynamic Headroom 2.4dB Dimensions Front Panel: 17/1/2 inches (44.5cm) wide, 5-3/8 inches Frequency Response (13.7cm) high. Depth behind front mounting panel is 18 1/8 +0, -0.5dB from 20Hz to 20,000Hz inches (46cm) including clearance for connectors. Panel clearance required in front of mounting panel is 1-1/8 Total Harmonic Distortion inches (2.9cm). 0.005% maximum at any power level from 250 milliwatts to rated power per channel from 20Hz to 20,000Hz, all Weight channels operating. 41 pounds (18.6Kg) net, 60 pounds (27.2Kg) in shipping carton Intermodulation Distortion 0.005% maximum if instantaneous peak output per channel does not exceed twice the rated output with all channels operating for any combination of frequencies from 20Hz to 20,000Hz.
Signal To Noise Ratio 110dB below rated output, Power Amplifier 100dB below rated output, Preamplifier
Sensitivity 250mV for 2.5V rated output, Preamplifier inputs 2.5V for rated output, Power Amplifier
Preamplifier Maximum Voltage Output 8V from 20Hz to 20,000Hz
Preamplifier Maximum Input Signal 10V
Damping Factor Greater than 40
14 Packing Instructions
Packing Instructions Quantity Part Number Description 1 033838 Shipping carton only In the event it is necessary to repack the equipment for ship- 2 033837 End Cap (Foam Pad) ment, the equipment must be packed exactly as shown be- low. It is very important that the four plastic feet are at- 1 033836 Inside carton only tached to the bottom of the equipment. This will ensure the 1 033725 Top Pad proper equipment location on the bottom pad. Failure to do 1 033698 Bottom pad this will result in shipping damage. 3 017218 Plastic foot (spacer) Use the original shipping carton and interior parts only if 1 033699 Wood skid they are all in good serviceable condition. If a shipping car- 3 101169 #10 x 2-¼ Wood screw ton or any of the interior part(s) are needed, please call or 3 104033 #10 x 1-¾ Wood screw write Customer Service Department of McIntosh Labora- tory. Please see the Part List for the correct part numbers. 4 017218 Plastic foot 4 100159 #10-32 x ¾ Machine screw 4 104080 #10 x 7/16 Flat washer
1 048432 Shipping carton complete with all the above parts
15 McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, NY 13903
