McIntosh MA-6400 Owners manual
MA6400
INTEGRATED
AMPLIFIER
MA6400
INTEGRATED
AMPLIFIER
IMPORTANT
SAFETY
INSTRUCTIONS
THESE
INSTRUCTIONS
ARE TO PROTECT
YOU AND THE
MclNTOSH
INSTRUMENT.
BE SURE TO
FAMILIARIZE
YOURSELF
WITH THEM
1. Read all instructions - Read the safety and operating instructions before operating the instrument.
2. Retain Instructions - Retain the safety and operating instructions for future reference.
3. Heed warnings - Adhere to warnings and operating instructions.
4. Follow Instructions - Follow all operating and use instructions.
WARNING: TO
THIS INSTRUMENT TO RAIN OR MOISTURE.
5. Power Sources - Connect the power supply only to the type described in the operating instructions
or as marked on the unit.
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,
convenience receptacles, and the point where they exit from the instrument.
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 builtin installation, such as a bookcase or cabinet, that may impede the flow of air through the ventilation
openings.
8. Heat - Locate the instrument away from heat sources such as radiators, heat registers, stoves, or
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
manual.
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.
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. Nonpolarized line cord adapters will defeat the safety provided by the polarized AC plug.
17.
CAUTION:
PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE
BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.
REDUCE
TO
PREVENT
RISK
OF
FIRE
ELECTRICAL
OR
ELECTRICAL
SHOCK
SHOCK,
DO NOT USE
DO NOT
THIS
(POLARIZED)
EXPOSE
04027100
BE082006
ATTENTION:
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.
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.
POUR
PEVENIR
CAUTION:
NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
LES
TO
PREVENT
CHOCS
ELECRIQUES
THE
RISK
OF
PAS
UTILISER
ELECTRIC
CETTE
SHOCK,
DO
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
RECOMMENDED WHEN PLAYING AT HIGH VOLUMES.
2
Your decision to own this piece of Mclntosh Stereo Equipment ranks you at the very top
among discriminating music listeners. You now have "The Best." The Mclntosh 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 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
THANK
YOU
SERVICE CONTRACT 4
INTRODUCTION 5
HOW TO INSTALL THE MA6400 5
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
TABLE OF
CONTENTS
3
MclNTOSH
THREE YEAR
SERVICE
CONTRACT
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.
The terms of the contract are:
1. If the instrument covered by this contract becomes defective, Mcintosh will provide all parts,
materials, and labor needed to return the measured performance of the instrument to the
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
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.
INTRODUCTION
The MA6400 can be installed upright on a table or shelf, standing on its own plastic feet. It
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.
INSTALLATION
5
FRONT PANEL
CONTROLS,
SWITCHES AND
PUSHBUTTONS
The MA6400 can be remotely controlled. Most of the operating functions performed at
the front panel, also can be done by the MA6400 Hand Held Remote Controller. The
following Information refers only to the front panel. Other sections of this manual explains
the functions and operation of the MA6400 Hand Held Remote Controller and the rear
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¬
PHONES. The TAPE 1 and TAPE 2 OUTPUTS are not affected by the Bass and Treble controls.
B. WATTS POWER OUTPUT
Two illuminated WATT meters are provided on the MA6400 front panel. The meters are peak
responding and their circuits are constantly reading the output power required by the musical
information.
One additional calibration mark above 100 watts is on the meters. This mark is 200 watts,
(+3dB). The amplifier cannot produce a continuous 200 watts of power, but can produce well
above 100 watts on program peaks, especially into lower impedance loads.
The upper scale on the meters is calibrated in average watts power, and the lower scale in
decibels. The meter calibration lines reading from right to left, starting at the 100 watt indication
are as follows.
100 Watts Indicated
40
20
10 Wans indicated
4
2
1 Watts Indicated
0.4
0.2
0.1 Watts Indicated
0.04
0.02
0.01 Watts indicated
0.004
0.002
6
C. POWER GUARD
Both channels of the MA6400 incorporate the Mclntosh POWER GUARD circuit which
prevents output clipping with its harsh and damaging distortion. A front panel LED Power Guard
indicator is provided for each of the channels. The LED lights whenever the Power Guard circuit
is activated for that channel. This indicates that the amplifier is producing its maximum
undistorted power output, and that you are being protected from overdrive and clipping. The
output level where Power Guard acts will be well above the rated power due to conservative
Mclntosh design philosophy.
(If the POWER GUARD indicators turn on and stay on continuously for either channel, it
indicates a problem is present. If this condition occurs, contact your Mclntosh dealer for
assistance.)
D. VOLUME / (MUTE LED)
VOLUME adjusts the volume level for the SPEAKERS 1 and 2 outputs, MAIN outputs and the
HEADPHONES. The TAPE 1 and 2 OUTPUTS are not affected by the VOLUME control.
A Red MUTE LED Just to the right of the VOLUME control turns ON to indicate the MA6400
output is MUTED. Activate the MUTE mode by pressing the MUTE pushbutton on the Hand Held
Remote Controller. Press MUTE again, press an UP or DOWN VOLUME pushbutton or press an
Input pushbutton to restore normal operation. Mute affects the SPEAKERS 1 and 2 and the MAIN
OUTPUTS. The TAPE 1 and 2 OUTPUTS and the HEADPHONES are not affected by MUTE.
FRONT PANEL
CONTROLS,
SWITCHES AND
PUSHBUTTONS
E. LOUDness-BALANCE
BALANCE control, (large outer knob): Adjusts the volume of the Left and Right channels
relative to each other. The BALANCE control affects only the SPEAKERS 1 and 2 outputs, the
MAIN outputs and the HEADPHONES. The TAPE 1 and 2 OUTPUTS are not affected by the
BALANCE control.
L, (Left): Turn the control to the left to accent the left channels by reducing the volume of the
right channels.
R, (Right): Turn the control to the right to accent the right channels by reducing the volume
of the left channels
LOUDness control, (small inner knob): Provides frequency response contoured to
compensate for the behavior of the human ear at softer listening levels. At the fully
counterclockwise detent position, the frequency response is perfectly flat and the loudness
circuit components are removed from the signal path. Turn the control clockwise to modify the
frequency response in the correct proportion required for softer listening levels. The
compensated frequency response is not affected by changes in the volume control settings.
First adjust the VOLUME Control for the desired listening level, then adjust the LOUDness
Control to the setting you personally prefer.
7
Loading...