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MA6400
INTEGRATED
AMPLIFIER
MA6400
INTEGRATED
AMPLIFIER
1. Read all instructions - Read the safety and operating instructions before operating the instrument.
IMPORTANT 2. Retain Instructions - Retain the safety and operating instructions for future reference.
3. Heed warnings - Adhere to warnings and operating instructions.
SAFETY 4. Follow Instructions - Follow all operating and use instructions.
INSTRUCTIONS WARNING: TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE
THIS INSTRUMENT TO RAIN OR MOISTURE.
5. Power Sources - Connect the power supply only to the type described in the operating instructions
THESE or as marked on the unit.
INSTRUCTIONS 6. Power Cord Protection - Route power supply cords so that they are not likely to be walked on or
pinched by items placed upon or against them, paying particular attention to cords at plugs,
ARE TO PROTECT convenience receptacles, and the point where they exit from the instrument.
YOU AND THE 7. Ventilation - Locate the instrument for proper ventilation. For example, the instrument should not be
placed on a bed, sofa, rug, or similar surface that may block ventilation openings; or, placed in a built-
MclNTOSH in installation, such as a bookcase or cabinet, that may impede the flow of air through the ventilation
openings.
INSTRUMENT. 8. Heat - Locate the instrument away from heat sources such as radiators, heat registers, stoves, or
BE SURE TO other appliance (including amplifiers) that produce heat.
9. Wall or Cabinet Mounting - Mount the instrument in a wall or cabinet only as described in the owner's
FAMILIARIZE manual.
YOURSELF 10. Water and Moisture - Do not use the instrument near water - for example, near a bathtub, washbowl,
kitchen sink, laundry tub, in a wet basement or near a swimming pool, etc.
WITH THEM 11. Cleaning - Clean the instrument by dusting with a dry cloth. Clean the panel with a cloth moistened
with a window cleaner.
12. Object and Liquid Entry - Do not permit objects to fall and liquids to spill into the instrument through
enclosure openings.
13. Nonuse Periods - Unplug the power cord from the AC power outlet when left unused for a long period
of time.
14. Damage Requiring Service - Service must be performed by qualified service personnel when:
A. The power supply cord or the plug has been damaged; or
B. Objects have fallen, or liquid has been spilled into the instrument; or
C. The instrument has been exposed to rain; or
D. The instrument does not appear to operate normally or exhibits a marked change in performance or
E. The instrument has been dropped, or the enclosure damaged.
15. Servicing - Do not attempt to service beyond that described in the operating instructions. All other
should be referred to qualified service personnel.
16. Grounding or Polarization - Do not defeat the inherent design features of the polarized plug. Non-
polarized line cord adapters will defeat the safety provided by the polarized AC plug.
17. C A U T I O N : TO PREVENT ELECTRICAL SHOCK DO NOT USE THIS (POLARIZED)
PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE
BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.
A T T E N T I O N : POUR PEVENIR LES CHOCS ELECRIQUES PAS UTILISER CETTE
FICHE POLARISEE AVEC UN PROLONGATEUR, UNE PRISE DE COURANT OU UNE
AUTRE SORTIE DE COURANT, SAUF SI LES LAMES PEUVENT ETRE INSEREES A
FOND SANS EN LAISSER AUCUNE PARTIE A DECOUVERT.
The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user
to the presence of uninsulated "dangerous voltage" within the product's enclosure that may
be of sufficient magnitude to constitute a risk of electric shock to persons.
CAUTION: TO PREVENT THE RISK OF ELECTRIC SHOCK, DO
NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
The exclamation point within an equilateral triangle is intended to alert the user to the
presence of important operating and maintenance (servicing) instructions in the literature
accompanying the appliance.
WARNING: 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
04027100 RECOMMENDED WHEN PLAYING AT HIGH VOLUMES.
BE082006
2
Your decision to own this piece of Mclntosh Stereo Equipment ranks you at the very top
THANK
among discriminating music listeners. You now have "The Best." The Mclntosh dedication to YOU
"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 piece of Mclntosh equipment. This
will ensure that you receive all the performance benefits this instrument can offer you, and that
it will become a highly valued part of your home entertainment system.
The serial number, purchase date, and Mclntosh Laboratory Service contract number
are important to you for possible insurance claim or future service. Record this information here.
Serial Number Purchase Date
Service Contract Number
SERVICE CONTRACT 4
INTRODUCTION 5 TABLE OF
HOW TO INSTALL THE MA6400 5 CONTENTS
FRONT PANEL CONTROLS SWITCHES AND PUSHBUTTONS 6, 7. 8. 9
HAND HELD REMOTE CONTROLLER 10, 11, 12
THE REAR PANEL AND HOW TO MAKE CONNECTIONS 13, 14, 15, 16, 17
HOOKUP DIAGRAM 18
TECHNICAL DESCRIPTION 19. 20, 21, 22
SPECIFICATIONS 23, 24
CUSTOM INSTALLATION DIAGRAM 25
RECOMMENDED VENTILATION CUTOUT 25
3
TAKE ADVANTAGE OF 3 YEARS OF CONTRACT SERVICE. . .
FILL IN THE APPLICATION NOW.
Your C39 Audio/Video Control Center will give you many years of satisfactory performance.
If you have any questions, please contact,
Mcintosh Laboratory Inc.
2 Chambers Street
Binghamton, New York 13903-2699
Phone: 607-723-3512
An application for A THREE YEAR SERVICE CONTRACT is included with this manual.
MclNTOSH The terms of the contract are:
THREE YEAR
1. If the instrument covered by this contract becomes defective, Mcintosh will provide all parts,
SERVICE
materials, and labor needed to return the measured performance of the instrument to the
CONTRACT
original performance limits free of any charge. The service contract does not cover any
shipping costs to and from the authorized service agency or the factory.
2. Any Mcintosh authorized service agency will repair all Mcintosh instruments at normal
service rates. To receive the free service under the terms of the service contract, the ser-
vice contract certificate must accompany the instrument when taken to the service agency.
3. Always have service done by a Mcintosh authorized service agency. If the instrument is
modified or damaged as a result of unauthorized repair the service contract will be cancell-
ed. Damage by improper use or mishandling is not covered by the service contract.
4. The service contract is issued to you as the original purchaser. To protect you from
misrepresentation this contract cannot be transferred to a second owner.
5. Units in operation outside the United States and Canada are not covered by the Mcintosh
Factory Service Contract, irrespective of the place of purchase. Nor are units acquired
outside the USA and Canada, the purchasers of which should consult with their dealer
to ascertain what, if any, service contract or warranty may be available locally.
4
The Mclntosh MA6400 is an Integrated Amplifier with 100 watts per channel, combined with
INTRODUCTION
a full featured remote controlled Preamplifier.
The MA6400 includes the popular Mclntosh features such as POWER GUARD, DC output
protection, thermal protection and Sentry Monitor protection circuits. Front panel power guard
indicators are included for each channel. Large illuminated front panel power level meters read
the power output of each channel to a high degree of accuracy.
The Preamplifier section can accommodate seven high level signal sources, or six high level
and one magnetic phono. All switching functions are performed with digital logic integrated
circuits driving ultra reliable, low distortion Electromagnetic switches. Bass and Treble controls
as well as an active Loudness control give the listener a wide range of options to shape the
frequency response to optimum for any listener preferences. All the circuit elements for these
controls are removed from the circuit path when the controls are in their flat settings. Rear panel
signal processor connections can be switched in or out of the circuit with a convenient switch.
Other features include two Tape Monitor switches, two Tape Copy switches and a
Headphone jack for private listening. The MA6400 can be muted with the Hand Held Remote
Controller. Refer to the Manual section TECHNICAL DESCRIPTION for further circuit and feature
information.
The MA6400 can be installed upright on a table or shelf, standing on its own plastic feet. It
INSTALLATION
can also be custom installed in furniture or cabinet of your choice. The required panel cutout
and unit dimensions are shown on a page near the back of this manual. Always provide
adequate ventilation for your MA6400. Cool operation insures the longest possible operating life
for any electronic instrument.
A custom cabinet installation should provide the following recommended minimum spacing
dimensions to insure adequate ventilation and cooling. Allow at least 1-1/2 inches (3.8cm) above
the unit so airflow is not obstructed. Allow at least 17-1/2 inches (44.5cm) behind the mounting
panel, which includes clearance for connectors. Allow 1-1/8 inches (2.9cm) in front of the
mounting panel for knob clearance.
In a custom cabinet Installation, It Is essential that the specified cutout be made In the
mounting shelf below the rear heat sink section of the MA6400 for adequate convection
cooling.
5
The MA6400 can be remotely controlled. Most of the operating functions performed at
FRONT PANEL
the front panel, also can be done by the MA6400 Hand Held Remote Controller. The
CONTROLS,
following Information refers only to the front panel. Other sections of this manual explains
SWITCHES AND
the functions and operation of the MA6400 Hand Held Remote Controller and the rear
PUSHBUTTONS
panel connections.
The last page of this manual folds out to show drawings of the front and rear panels of
the MA6400. This will help you In Identifying and locating the front panel controls,
switches, pushbuttons and the rear panel connectors and switches. The letters and
numbers on the drawings refer to the Information that follows.
A. BASS AND TREBLE
Provides 12dB boost and cut. with neutral flat response at the center detent position. The
Bass and Treble controls affect the SPEAKERS 1 and 2, MAIN OUTPUTS and the HEAD