McIntosh MCC602TM User Manual

MCC602TM Power Amplifier
Owners Manual
MCC602TM
McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 FAX: 607-724-0549
WARNING - TO REDUCE RISK OF
FIRE OR ELECTRICAL SHOCK, DO
NOT EXPOSE THIS EQUIPMENT TO
RAIN OR MOISTURE.
IMPORTANT SAFETY INSTRUCTIONS!
PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT.
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Warning: To reduce risk of fire or electrical shock, do not expose this equipment to rain or moisture. This unit is capable of producing high sound pres­sure levels. Continued exposure to high sound pres­sure levels can cause permanent hearing impair­ment or loss. User caution is advised and ear protec­tion is recommended when playing at high volumes.
6. Disconnect this equipment when unused for long peri­ods of time.
7. Only use attachments/accessories specified by the manufacturer.
Installation:
8. Do not block any ventilation openings. Install in accor­dance with the manufacturers instructions.
9. Do not install near any heat sources such as radiators, heat ducts or other equipment that produce heat.
10. Do not use this equipment near water.
11. Do not expose this equipment to dripping or splashing and ensure that no objects filled with liquids are placed on the equipment.
12. Do not mount this product with an unstable bracket as the equipment may fall, causing serious injury to a person, and serious damage to the product.
NO USER-SERVICEABLE PARTS
INSIDE. REFER SERVICING TO
QUALIFIED PERSONNEL.
To prevent the risk of electric shock, do not remove
bottom cover. No user serviceable parts inside.
Care of Equipment:
14. Clean only with dry cloth.
15. Do not permit objects or liquids of any kind to be pushed, spilled and/or fall into the equipment through enclosure openings.
Repair of Equipment:
16. Refer all servicing to qualified service personnel. Ser­vicing is required when the equipment has been dam­aged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the equipment, the equipment has been exposed to rain or moisture, does not operate normally, or has been dropped.
17. Do not attempt to service beyond that described in the operating instructions. All other service should be re­ferred to qualified service personnel.
18. When replacement parts are required, be sure the ser­vice technician has used replacement parts specified by McIntosh or have the same characteristics as the origi­nal part. Unauthorized substitutions may result in fire, electric shock, or other hazards.
19. Upon completion of any service or repairs to this prod­uct, ask the service technician to perform safety checks to determine that the product is in proper operating condition.
Connection:
13. Route DC power cords so that they are not likely to be pinched by items placed upon or against them, paying particular attention to the point where they enter the instrument.
2
Thank You
Table of Contents
Your decision to own this McIntosh MCC602TM Two Channel Power Amplifier ranks you at the very top among discriminating music listeners. You now have The Best. The McIntosh dedication to Quality, is assurance that you will receive many years of musical enjoyment from this unit.
Please take a short time to read the information in this manual. We want you to be as familiar as possible with all the features and functions of your new McIntosh.
Please Take A Moment
The serial number, purchase date and McIntosh dealer name are important to you for possible insurance claim or future service. The spaces below have been provided for you to record that information:
Serial Number:
Purchase Date:
Dealer Name:
Technical Assistance
If at any time you have questions about your McIntosh product, contact your McIntosh dealer who is familiar with your McIntosh equipment and any other brands that may be part of your system. If you or your dealer wish addi­tional help concerning a suspected problem, you can re­ceive technical assistance for all McIntosh products at:
McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903 Phone: 607-723-1545 Fax: 607-723-3636
Customer Service
If it is determined that your McIntosh product is in need of repair, you can return it to your dealer. You can also return it to the McIntosh Laboratory Service Repair department. For assistance on factory repair return procedure, contact the McIntosh Repair Department at:
McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903 Phone: 607-723-3515 Fax: 607-723-1917
Safety Instructions ............................................................. 2
Thank You.......................................................................... 3
Please Take a Moment ....................................................... 3
Customer Service ............................................................... 3
Table of Contents ............................................................... 3
General Notes .................................................................... 3
Introduction ....................................................................... 4
Performance Features ........................................................ 4
Dimensions ........................................................................ 5
Installation ......................................................................... 6
Side Panel Cooling, Connections and Switch ................... 7
How to Connect for Two Channels ................................... 8
How to Connect for Mono Parallel ................................. 10
Top Panel Displays .......................................................... 12
How to Operate ................................................................ 13
How to Replace the Fuses ............................................... 14
Technical Description and Block Diagrams .................... 15
Specifications .................................................................. 18
Packing Instruction .......................................................... 19
General Notes
1. Do not connect the Amplifier Speaker Negative Terminal Connection directly to the Vehicle Chassis. Failure to observe this could result in damage to your Amplifier.
2. For additional connection information, refer to the owner s manual(s) for any component(s) connected to the MCC602TM Amplifier.
3. There is a built-in turn on delay which will mute the speaker outputs for approximately two seconds when the amplifier is turned on.
4. It is very important that loudspeaker cables of adequate size be used in your music system, to ensure that there will be no power loss or heating. Use at least 14 Gauge (AWG) wire size or larger. The speaker output terminals are large enough to accept 12 Gage wire.
5. It is advisable to place an in-line fuse as close as possible to the battery.
6. The pin configuration for the XLR Balanced Input connectors on the MCC602TM. Refer to the diagram for connections.
PIN 1: Shield or ground PIN 2: (+) input PIN 3: (-) input
7. The MCC602TM can accept speaker level inputs at its Balanced Input Jacks. Refer to the diagram for connection.
PIN 1: No connection PIN 2: Power Amplifier Output Connection (+) from the
Control Center
PIN 3: Power Amplifier Output Connection (-) from the
Control Center
Pin 2
Pin 3
Pin 1
Copyright 2000 ã by McIntosh Laboratory, Inc.
3
General Notes, cont
8. The MCC602TM incorporates the very latest in Fully Double Balanced Circuitry. As a result, the Loudspeaker Negative Connections are above chassis ground and are not common between channels. Do not combine any connections together or ground them.
9. In the event that MCC602TM Power Amplifier over heats, due to improper ventilation and/or extremely high ambient temperature, the built in protection circuits together with the built-in cooling fans will activate. The Power Guard LEDs will both continuously indicate On and no sound will be heard. When the temperature of the MCC602TM has returned to a safe condition, sound will return and the Power Guard Indictors will return to normal operation.
Introduction
Now you can take advantage of traditional McIntosh stan­dards of excellence in the MCC602TM. Two 300 watt high current output channels will drive any high quality loud­speaker system to its ultimate performance. The MCC602TM reproduction is sonically transparent and ab­solutely accurate. The McIntosh Sound is The Sound of the Music Itself.
circuit is possible ONLY with the exclusive McIntosh Out­put Autoformer. The Balanced Input Connections guard against induced noise and allow long cable runs without compromising sound quality.
· Patented Autoformers
McIntosh designed and manufactured Output Autoformers provide an ideal match between the amplifier output stages and speaker loads of 2, 4 and 8 ohms. The Autoformers also provide perfect DC protection for your valuable loud­speakers.
· Power Guard
Both channels include the patented McIntosh Power Guard circuit that prevents the amplifier from being over driven into clipping, with its harsh distorted sound that can also damage your valuable loudspeakers.
· Sentry Monitor
McIntosh Sentry Monitor power output stage protection circuits ensure the MCC602TM will have a long and trouble free operating life.
Performance Features
· Power Output
The MCC602TM consists of two separate power amplifier channels, each capable of 300 watts into 2, 4 or 8 ohm loudspeakers with less than 0.005% distortion.
· Mono Parallel Operation
The MCC602TM can be set in Mono Parallel Operation with 600 watts output into 1, 2, or 4 ohm loudspeakers with less than 0.005% distortion. It can also function as two 300 watt amps both amplifying the same mono input signal.
· High Current Output
A peak output current of 50 amperes ensures that the MCC602TM will successfully drive high quality loud­speakers, such as McIntosh, for a truly exciting sound ex­perience.
· Fully Balanced Circuitry
The MCC602TM amplifier is fully balanced from input to speaker output. Two matched amplifiers operate in PUSH­PULL with their outputs magnetically combined in the Output Autoformer. Each half of the amplifier contains complementary balanced circuitry. The resulting double balanced configuration cancels virtually all distortion. This
· Thermal Protection with Multi-Speed Cooling Fans
Built-in thermal protection circuits guard against overheat­ing which could shorten the normal long life expectancy of your McIntosh power amplifier. Cooling fan speed is con­trolled by temperature sensors attached to the interior of the extruded aluminum cooling tunnel. The fans normally run at a quiet low speed, when needed the fans will auto­matically switch to a higher speed for increased cooling.
· Illuminated Power Meters
The Illuminated Power Output Watt Meters on the MCC602TM are peak responding and almost ten times faster than a professional VU meter. They also indicate the true power output of the amplifier regardless of the loud­speaker impedance, as they measure both the voltage and current going to them.
4
General Notes cont, Introduction, Performance Features and Dimensions
Dimensions
The following dimensions can assist in determining the best location for your MCC602TM. There is additional in­formation on the next page pertaining to installing the MCC602TM into your vehicle.
Top View of the MCC602TM
26-
7/8
"
68.3cm
23-
47/64
60.29cm
16-
7/8
"
42.89cm
10-
1/32
"
25.46cm
3-
11/16
"
8.05cm
"
2-
15/16
7.52cm
Side View of the MCC602TM
11"
27.93cm
8"
20.32cm
"
11
-
7/8"
31.15cm
12
-1/2"
31.75cm
11/32
"
10.93cm
2-
15/16
7.49cm
"
4-
3/16
10.64cm
"
5
Installation
It is recommended that a professional who is skilled in all aspects of installation and operation install the MCC602TM and any associated mobile audio equipment.
Amplifier Ventilation
Always provide adequate ventilation for the MCC602TM. The amplifier requires an adequate airflow into the cooling fans, which are located on the left side of the amplifier. The warm air exits the amplifier through vents on the heatsinks. See figure 1. Be sure to provide at least 1-1/2
Cool Air
inches clearance in front of the cooling fans and 1 inch clearance at the sides of the heatsinks.
The cooling fans are controlled by tem-
Figure 1
perature sensors, attached to the interior of the tunnel. The fans are normally off. If the program material contains sustained loud pas-
Cool Air
sages demanding high power, the fans will turn-on to increase cooling. If cooling is still not sufficient, additional heating will shut down the amplifiers internal power supply completely and the Power Guard LEDs will light. The fans will continue to run and once normal temperature is restored, operation will resume.
The amplifier can be mounted vertically or horizontally and may be located under a seat if adequate clearance is available. The pre­ferred installation method is to mount the am-
Figure 2
plifier directly to the vehicle main frame us­ing the hardware supplied with the amplifier.
It is not recommended that the amplifier be mounted under the hood or in a location where it will be directly exposed to the ele­ments. The openings in the fan housings and heat tunnel vents can allow internal compo­nents to be damaged by exposure to water, chemicals or any form of road dust or debris.
Removing the End Caps
To access the MCC602TM Connecting Terminal Blocks, remove the Glass Panel first (the above step) and then re­move the Phillips Screws holding the End Caps on both sides of the amplifier and lift the end caps off. See figure 3.
Warm Air
Warm Air
Remove Top Cover Screws
Remove Top Cover Screws
Remove End Cap Screws
Removing the Glass Panel
Remove the eight hex bolts with the supplied 3/32 hex key from the MCC602TM Top Glass Panel. See figure 2. Attach the supplied suction cup to either side of the top glass panel and carefully raise it high enough to put your hand under. Temporarily place the re­moved glass panel in a safe place, remove the suction cup and save it for future use.
6
Figure 3
Remove End Cap Screws
Installation, Side Panel Cooling, Connections, Controls and Switch
Left Side View
Cooling Fan Air Intake
BALANCED INPUT for audio cables from control center audio outputs
Connect to the Negative (-) vehicle battery terminal
CHANNEL 1 OUTPUT Connections for 2, 4 or 8 ohm loudspeakers
Connect to the positve (+) vehicle battery terminal with an inline fuse
Cooling Fan Air Intake
Right Side View
CHANNEL 2 OUTPUT Connections for 2, 4 or 8 ohm loudspeakers
BALANCED INPUT for audio cables from control center audio outputs
CHANNEL 1 UNBALANCED INPUT for audio cables from control center audio output
CHANNEL 1 SENSITIVITY Input Sensitivity Control
MODE Switch selects Stereo or Mono Parallel Mode
Controls the Power Guard Circuit when connected to certain McIntosh Control Centers
CHANNEL 2/MONO UNBALANCED INPUT for audio cables from control center audio output
CHANNEL 2/MONO SENSITIVITY Input Sensitivity Control
Receives the Amplifier Turn-ON signal from a McIntosh Control Center
7
How to Connect for Two Channels
1. Connect the power control cable from the Control Cen­ter Amp ON to the MCC602TM ON Connector on the right side of the Amplifier.
Note: All cables should be connected to the amplifier before
connecting the DC power cables to the battery.
2. Connect a cable from a McIntosh Control Center with Power Guard to the MCC602TM PG Connector on the right side of the amplifier.
3. Connect the CHANNEL 1 4(-) Ohm OUTPUT of the Power Amplifier to the Crossover Network Negative (-) Input Terminal and the CHANNEL 1 4(+) Ohm OUTPUT to the Crossover Network (+) Input Termi­nal. Connect the CHANNEL 2 OUTPUTs to the sec­ond Crossover Network in a similar manor.
4. Connect the cables from the Crossover Network to the respective Woofer/Midrange Terminals, for both chan­nels.
5. Connect the cables from the Crossover Network to the Tweeter Terminals, for both channels.
6. Connect audio cables from the Control Center Front Outputs to the appropriate MCC602TM Inputs.
7. Connect the MCC602TM DC input terminals on the left side of the amplifier to the vehicle battery termi­nals using a minimum size of 4 AWG cables.
Note: It is advisable to place an in-line fuse as close as
possible to the battery.
Left Tweeter Left Woofer/Midrange
McIntosh Control Center
Left Front Output
Right Front Output
Power Guard
(orange)
Amp ON (blue/white)
8
How to Connect for Two Channels
Right TweeterRight Woofer/MidrangeRight Crossover Network (4 Ohms)Left Crossover Network (4 Ohms)
-
Vehicle Battery
+
Fuse
9
How to Connect for Mono Parallel
1. Connect the Power Control Cable from the Control Center Amp ON to the MCC602TM ON connector on the right side of the amplifier.
Note: All cables should be connected to the amplifier before
connecting the DC power cables to the battery.
2. Connect a cable from a McIntosh Control Center with Power Guard to the MCC602TM PG connector on the right side of the amplifier.
3. Connect cables from the amplifiers CHANNEL 2 (+) and (-) OUTPUT terminals to the CHANNEL 1 (+) and (-) OUTPUT terminals.
Note: In Mono Parallel Mode, the impedance presented to the
speaker is half of the number marked on the terminals, refer to the Mono Parallel Hookup Connections chart.
4. Connect a cable from a first Subwoofers (+) and (-) Terminals to the Amplifiers (+) and (-) Terminals of the CHANNEL 2 OUTPUT.
5. Connect a cable from the first Subwoofers (+) and (-) Terminals to the Second subwoofers (+) and (-) Termi­nals.
6. Connect audio cables from a McIntosh Control Center to the INPUTs of a McIntosh Crossover Network.
7. Connect audio cables from the McIntosh Crossover Network SUB OUTPUT to the MCC602TM 2/MONO Input.
PARALLEL, both channels can be fed from the 2/MONO Input and each drive a separate speaker. In this case the speakers are connected as described in the HOW TO CONNECT FOR TWO CHANNEL section of this manual on page 8.
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McIntosh Control Center
Note: Do not connect a cable to the LEFT input.
8. Connect the MCC602TM DC input terminals to the vehicle battery terminals using a minimum size of 4 AWG cables.
Note: It is advisable to place an inline fuse of sufficient size as
close as possible to the battery. An alternative configuration is, when the MCC602TM is set for MONO
Left Front Output
Right Front Output
Power Guard
(orange)
Amp ON (blue/white)
McIntosh Crossover Network
10
How to Connect for Mono Parallel
Woofer (4 Ohm)
-
+
Woofer (4 Ohm)
-
+
-
Vehicle Battery
+
Fuse
11
CHANNEL 1 POWER GUARD LED lights when the Power Guard Circuit activates for Amplifier Channel 1
CHANNEL 2 POWER GUARD LED lights when the Power Guard Circuit activates for Amplifier Channel 2
12
CHANNEL 1 METER indicates the Channel 1 Power Output
CHANNEL 2 METER indicates the Channel 2 Power Output
Introduction
Top Panel Displays and How to Operate the MCC602TM
The McIntosh MCC602TM is a highly versatile amplifier that can be configured in many ways. This manual gives examples of some of the most common configurations and will guide you through the basic operation, however we suggest you refer to your dealer for further information on the use of this unit.
Power
The MCC602TM will turn On or Off when the Control Center turns On or Off.
Note: There must be an Amp ON connection between the MCC602TM and the signal source unit in order for the amplifier power turn On and Off to function.
Input Sensitivity Controls
The SENSITIVITY controls allow the setting of the input sensitivity, of both amplifier channels, to provide an ideal match for the signal source being used. The most desirable setting allows the Control Center to have a useful volume range as wide as possible from loud to soft. A good place to start is to set the amplifiers SENSITIVITY Control to the output voltage called out in your control center owners manual. The Sensitivity Controls can be set for any sensitivity from
Figure 4
1 volts to 8 volts. Refer to figure 4.
Note: When used in conjunction with a McIntosh control
center, you may find setting the Sensitivity controls to the center detent (2V) works best. In Mono Parallel
Mode the Input SENSITIVITY Control for the CHANNEL 2/MONO channel is used and the
SENSITIVITY Control for CHANNEL 1 is
inoperative.
Power Output Meters
There are two illuminated watt meters on the glass panel, displaying the power output for both channels. The upper scale shows power in Watts, the lower scale displays the power in Decibels (dB). The meters respond to all the musical informa­tion be­ing pro-
Figure 6
duced by the amplifier. They indicate to an accuracy of at least 95% of the power output with only a single cycle of a 2000Hz tone burst. Refer to figure 6.
Mode Switch
In the Mono Parallel Mode, the two channels are tied together allowing the amplifier to operate as one full frequency range 600-watt amplifier. A typical Mono Mode application is to drive a subwoofer. Refer to figure 5.
Figure 5
13
How to Replace the Fuses
If the MCC602TM produces no sound, no Meter Illumination, the power control and the power supply connections seem secure, one or more of the Amplifier Fuse(s) may have failed. Under normal operating conditions your amplifiers fuses should not fail. Failure of a fuse is usually an indication of a problem. Replacing the fuse, if there is problem in the amplifier, may incur a risk of further damage. Refer to figures 7, 8 and 9.
Caution: Disconnect the Amplifier from the
Vehicle Battery ( or DC Power Supply) as Potentially Dangerous Currents exist inside the amplifier.
1. Before accessing fuses, disconnect both the positive and negative power cables from the DC input terminals on the left side of the amplifier using a 5/32 hex key.
2. Remove the Top Glass Panel by first removing the eight hex bolts with the sup­plied 3/32 hex key.
3. Attach the supplied suction cup to either side of the top glass panel and carefully raise it high enough to put your hand under. Temporarily place the removed glass panel in a safe place, remove the suction cup and save it for future use.
4. Remove the Phillips Screws holding the End Caps on both sides of the amplifier and lift the end caps off.
5. Remove the fuses with needle nose pliers, taking care to avoid hitting the wattmeter during removal. Do not lever the pliers against the wattmeter.
Note: To determine if the fuse has failed, examine
the link between the two fuse legs to see if it has a break in it.
6. Replace the fuse with one of the same type and rating as unauthorized substitutions may prove hazardous to you and the amplifier.
7. When reinserting the fuse, set it in place with the pliers, then push it the rest of the way in with your finger to avoid having the pliers slip and hit the circuit board.
8. Reinstall the Top Glass Panel.
9. Reconnect the power cables to the vehicle battery.
If the replacement fuse(s) fails again, have the amplifier repaired at a McIntosh Service Center.
How to Replace the Fuses
Remove Top Cover Screws
Figure 7
Remove Top Cover Screws
Remove End Cap Screws
Figure 8
Remove End Cap Screws
Location of the four fuses
Figure 9
14
Technical Description
Technical Description
McIntosh Laboratory, the company who introduced the worlds first amplifier over fifty years ago that could be called High Fidelity, has done it again. The McIntosh engineering staff has created a power amplifier without compromise, using the most advanced McIntosh circuit design concepts.
A continuous average power output rating of 300 watts and with an output current of greater than 50 amperes per channel, makes this not only the most advanced, but also the most powerful amplifier McIntosh has ever manufac­tured. The distortion limits for the MCC602TM are no more than 0.005% at rated power output for all frequen­cies from 20Hz to 20,000Hz. Typical performance at mid frequencies is less than 0.002%. The true distortion read­ings on the MCC602TM are so low, it takes special mea­suring techniques to make accurate readings. The MCC602TM can deliver the best possible performance from any type of high quality loudspeaker system.
Creating an amplifier with this level of performance did not come easily. Many months of design, testing and measuring were required. Extensive controlled listening tests, the ultimate form of measuring, were made before the final design was accepted.
Design Philosophy
The design philosophy incorporated in the MCC602TM involved several different techniques, all based on sound scientific logic. Every stage of voltage or current amplifi­cation must be as linear as possible prior to the use of negative feedback. McIntosh engineers know how to prop­erly design negative feedback circuits so they contribute to
the extremely low distortion performance expected from a McIntosh amplifier. The typical McIntosh owner would never accept the approximately 100 times higher distortion of many non-feedback designs.
Double Balanced Push Pull design is used from input to output. Each half of the amplifier contains complimentary balanced circuitry. The resulting double balanced configu­ration cancels even order distortion. Refer to figure 11 on page 18.
All transistors are selected to have nearly constant cur­rent gain over the entire current range they must cover. Output transistors in particular, have matched uniform cur­rent gain, high current-bandwidth product and large active region safe operating area. An automatic tracking bias sys­tem completely eliminates any trace of crossover distor­tion. All the resistors are Precision Metal Film types and low dielectric absorption film capacitors are used in all critical circuit locations.
The output signals of the two balanced circuits are coupled together in the unique McIntosh MCC602TM Out­put Autoformer. It provides low distortion power transfer at frequencies from below 20Hz to well beyond 20,000Hz with optimum impedance points of two ohms, four ohms and eight ohms. The unequaled expertise of McIntosh in the design and manufacturing of autoformers is legendary in the high fidelity industry.
The high efficiency circuit design of the MCC602TM contributes to low operating temperatures. McIntosh ampli­fiers are constructed in an extruded aluminum tunnel that has exhaust ports along its length. These exhaust ports are tuned to provide even air flow, over the surface of the tun-
Inside the MCC602TM
15
nel cooling fins. Temperature sensors, attached to the inte­rior of the tunnel, control the cooling fans. The fans are normally off; if the program material contains sustained loud passages demanding high power, the fans will turn on to increase cooling.
Autoformers
All solid state power amplifier output circuits work best into what is called an optimum load. This optimum load may vary considerably from what a loudspeaker requires. In the case of more than one loudspeaker connected in parallel, the load to the power amplifier may drop to two ohms or even less. A power amplifier connected to a load that is lower than opti­mum, causes more output current to flow, which results in extra heat being generated in the power output stage. This increase in temperature will result in a reduced life
Figure 10
expectancy for the amplifier.
The Autoformer creates an ideal match between the power amplifier output stage and the loudspeaker. Refer to figure 10. A McIntosh amplifier with an Autoformer can be used to safely drive multiple speakers without reducing the life expectancy of the power amplifier.
There is absolutely no performance limitation with an Autoformer. Its frequency response exceeds that of the out­put circuit itself, and extends well beyond the audible range. Its distortion level is so low it is virtually impossible to measure.
In the rare event of a power amplifier output circuit fail­ure, the McIntosh Autoformer provides absolute protection from possible damage to your valuable loudspeakers. The unequaled expertise of McIntosh in the de­sign and manufacturing of Autoformers is leg­endary in the high fidel­ity industry. McIntosh
Figure 12
Block Diagram
of both
Amplifier Channels
16
Figure 11
Technical Description, cont
engineers know how to do it right.
Protection Circuits
The MCC602TM incorporates its version of the McIntosh Sentry Monitor output transistor protec­tion circuit. Refer to figure 12. There is
Input Test Signal
absolutely no compromise in sonic per­formance with this circuit, and it ensures safe operation of the amplifier under even the most extreme operating condi­tions. The different types of protection circuits incorporated in the MCC602TM insure a long and safe operating life. This is just one of the many characteris-
Figure 13
tics of McIntosh Power Amplifiers that make them world famous.
Without Power Guard
The MCC602TM also includes the unique patented McIntosh POWER GUARD circuit. Power Guard elimi­nates the possibility of ever overdriving the amplifier into clipping. Refer to fig­ures 13, 14 and 15. An overdriven am­plifier can produce both audible and in­audible distortion levels exceeding
Figure 14
40%. The audible distortion is unpleas­ant to hear, but the inaudible ultrasonic
With Power Guard
distortion is also undesirable, since it can damage valuable loudspeaker sys­tem tweeters. You will never experience the harsh and damaging distortion due to clipping.
The POWER GUARD circuit is a waveform comparator, monitoring both the input and output waveforms. Under
Figure 15
normal operating conditions, there are no differences be­tween the shape of these waveforms. If an amplifier chan­nel is overdriven, there will be a difference between the two signal waveforms. When the difference exceeds 0.3% (equivalent to 0.3% harmonic distortion), the POWER GUARD activates the PG light and a dynamic electronic attenuator at the amplifier input reduces the input volume just enough to prevent any further increase in distortion. The POWER GUARD circuit acts so fast that there are ab­solutely no audible side effects and the sonic purity of the music reproduction is perfectly preserved. The MCC602TM Power Amplifier with POWER GUARD is not limited to just the rated power output, but will actually produce distortion free output well above its rated power due to the McIntosh philosophy of conservative design.
Power Supply
The high efficiency Pulse Width Modulation Regulated Power Supply operates with 85% efficiency and features MOSFET power transistors switching at 40KHz. Refer to figure 16. The power supplies are independent for each channel. Regulation is maintained from 12 to 16 volts at the battery input. The turn-on inrush current is cushioned, by a soft start circuit in the power supply which eliminates component stress during turn-on.
Accidental blockage of the cooling intake port or some other fault condition could cause the amplifier temperature to continue to rise, even with the fan at full speed. A tem­perature sensing circuit in the power supply will reduce heat dissipation by lowering the voltage to the amplifier. If cooling is still not sufficient, additional heating will shut down the power supply completely. The fan will continue to run and once normal temperatures are restored, opera­tion will resume.
Power Supply
Figure 16
17
Specifications
Specifications
Power Output Stereo
Minimum sine wave continuous average power output per channel, all channels operating is: 300 watts into 2 ohm load 300 watts into 4 ohm load 300 watts into 8 ohm load
Power Output Mono
Minimum sine wave continuous average power output per channel, all channels operating is: 600 watts into 1 ohm load 600 watts into 2 ohm load 600 watts into 4 ohm load
Rated Power Band
20Hz to 20,000Hz
Total Harmonic Distortion
Maximum Total Harmonic Distortion at any power level from 250 milliwatts to rated power output is:
0.005% for 2, 4 or 8 ohm loads (Stereo)
0.005% for 1, 2 or 4 ohm loads (Mono)
Power Requirements
12 Volts DC, 3.5 amps (idle) - 100 amps (600 watts)
Dimensions
26-7/8 inches (68.3cm) wide, 12-1/2 inches (31.75 cm) depth, 4-3/16 inches (10.64 cm) high
Weight
50.5 pounds (22.9 Kg) net, 58.5 pounds (26.5 Kg) in shipping carton
Dymanic Headroom
1dB
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz +0, -3dB from 10Hz to 50,000Hz
Sensitivity
1Volt balanced or unbalanced inputs
A-Weighted Signal To Noise Ratio
114dB (2V)
Intermodulation Distortion
Maximum Intermodulation Distortion if instanta­neous peak output per channel does not exceed twice the rated output, for any combination of fre­quencies from 20Hz to 20,000Hz, with all channels operating is:
0.005% for 2, 4 or 8 ohm loads (Stereo)
0.005% for 1, 2 or 4 ohm loads (Mono)
Input Impedance
15,000 ohms balanced or unbalanced inputs
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Packing Instructions
Packing Instructions
In the event it is necessary to repack the equipment for shipment, the equipment must be packed exactly as shown below, failure to do so will result in shipping damage. Make sure that the Top Glass Panel is firmly secured to the chassis using the supplied hex head screws.
Use the original shipping carton and interior parts only if they are all in good serviceable condition. If a shipping carton or any of the interior part(s) are needed, please call or write Customer Service Department of McIntosh Labo­ratory. Please see the Part List for the correct part numbers.
Quantity Part Number Description
1 034140 Shipping carton only 2 034141 End cap (Foam pad) 1 034142 Center Support (Foam pad)
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McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, NY 13903
McIntosh Part No. 040730
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