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. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. Read all instructions - Read the safety and operating instructions before operating the instrument. Retain Instructions - Retain the safety and operating instructions for future reference. Heed warnings - Adhere to warnings and operating instructions.
Your decision to own this piece of Mclntosh Stereo Equipment ranks you at the very top THANK YOU 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.
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 MclNTOSH THREE YEAR SERVICE CONTRACT An application for A THREE YEAR SERVICE CONTRACT is included with this manual. The terms of the contract are: 1.
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.
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.
C. POWER GUARD FRONT PANEL CONTROLS, SWITCHES AND PUSHBUTTONS 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.
FRONT PANEL CONTROLS, SWITCHES AND PUSHBUTTONS The LOUDness control affects the SPEAKERS 1 and 2 outputs, the MAIN OUTPUTS and the HEADPHONES. The TAPE 1 and 2 OUTPUTS are not affected by the LOUDness control. F. IR SENSOR WINDOW The IR (Infrared) sensor that accepts IR signals from the MA6400 Hand Held Remote Controller. G. TAPE MONitor 1 and 2 Press TAPE MON 1 or 2 to listen to playback of tapes from either of two tape recorders.
the SPEAKERS 1 and 2 outputs, the MAIN OUTPUTS and the HEADPHONES. A Red LED above FRONT PANEL CONTROLS, SWITCHES AND PUSHBUTTONS the pushbutton will turn ON to indicate the MONO mode of operation. The MONO pushbutton does not affect the TAPE 1 and 2 OUTPUTS. They are always stereo. L. 1 SPEAKERS 2 Select SPEAKERS 1. SPEAKERS 2. or both pairs of speakers simultaneously. A Red LED above each SPEAKERS pushbutton lights to indicate which Speakers are turned ON.
MA6400 HAND HELD REMOTE CONTROLLER The descriptions and functions of the MA6400 Remote Controller pushbuttons refer to the numbers on the drawings. Several operating functions are designed to be used when the optional RCT-2 Remote Control Translator is added to the MA6400. The RCT-2 is a learning device which allows the MA6400 to remotely control other brands of compatible accessories. SPECIAL NOTE: The pushbuttons marked In black do not function with the MA6400.
MA6400 HAND HELD REMOTE CONTROLLER 6. Press the POWER pushbutton to turn the MA6400 system ON. Press again to turn the system OFF. 7. The ACC (Accessory) ON or OFF pushbuttons function when the optional RCT-2 Remote Control Translator is being used with the MA6400. They can be programmed to turn on and off the AC power of an accessory component. (Pushbuttons listed under Number 8 and Number 9 function when a compatible Mclntosh Tuner such as the MR7084 Is connected to the MA6400.) 8.
MA6400 HAND HELD REMOTE CONTROLLER cable with 1/8 inch mini phone plugs on each end. Connections are to the Tip (+) and Sleeve (-) of the plug.) Press REVIEW to start the automatic 3 second audition of each of the stations stored in the tuner preset memory. Press REVIEW again to stop on the desired preset. Cancel the automatic REVIEW process by pressing REVIEW a second time, or pressing any other Tuner function pushbutton. SEEK UP ( ) or SEEK DOWN ( ) cycles tuning through all station frequencies. 10.
Use high quality cables to Interconnect the accessory equipment used with your MA6400. This will ensure the best possible overall performance from your stereo system. Your Mclntosh dealer can advise you on the type and length of cables best suited for your specific Installation. To minimize the possibility of hum pickup or Interference, locate the cables away from AC power cords or loudspeaker cables. 1.
THE REAR PANEL AND HOW TO MAKE CONNECTIONS signals only to an external power amplifier or accessory, set the PWR AMP IN to the EXT position. When the switch is set to the INT position, the MA6400 preamplifier section feeds signals directly to the internal power amplifier section. 5. TAPE 1 and TAPE 2 OUTPUTS These outputs provide signals to feed two separate tape recorders. The program that appears at the tape outputs is determined by the setting of the front panel Input Selector switch.
8. VIDEO Use these inputs for the audio signals from accessories such as a Laser Disc Player. VCR, or TV receiver. Connect a cable from the left channel audio output of the video unit to the MA6400 L (Left) channel VIDEO INPUT. Connect a cable from the right channel audio output of the video unit to the MA6400 R (Right) VIDEO INPUT. Use the VIDEO input when an optional MVS-3 Audio/Video Selector is added to the MA6400.
THE REAR PANEL AND HOW TO MAKE CONNECTIONS Connect a cable from the right channel turntable output to the MA6400 R (Right) PHono INPUT. Set the AUX-PH SELECTOR to the PH position. (The AUX inputs are not active in this operating mode.) The MA6400 phono input circuit is designed to accept the signals from a standard moving magnet phono cartridge. The input impedance is 47K ohms and 65pF capacitance. GND (Ground) If there is a separate ground wire from the turntable, connect it to the GND terminal. 14.
The 120 volt AC current switching capabilities of the MA6400 can be Increased by adding an optional Mclntosh R612A or PC-2 Power Control Relay. 18. SPEAKERS 1 - SPEAKERS 2 Connect two pairs of loudspeakers to the SPEAKERS 1 and SPEAKERS 2 terminals. Make sure that the speaker plus and minus. (Hot and Common) terminals are connected to the corresponding plus (+) and minus (-) amplifier terminals.
HOOKUP DIAGRAM 18
DESIGN PHILOSOPHY The design philosophy incorporated in the MA6400 involved many different techniques, all based on sound scientific logic. Every stage of voltage or current amplification is designed to be as linear as possible. Negative feedback is then utilized to enhance the performance. Mclntosh engineers know how to properly design negative feedback circuits so they contribute to the extremely low distortion performance expected from a Mclntosh amplifier.
TECHNICAL DESCRIPTION power transistors for the output power produced. The amplifier uses large area heat sinks to efficiently dissipate the transistor heat. Natural convection air flow is sufficient for safe cool operation. If the cooling air is blocked, or the amplifier operating temperature is forced too high, thermal sensors will turn off the speaker relays. When the problem is corrected and the amplifier cools to its normal operating temperature, the speaker relays will turn back on.
Each switch consists of a sealed glass tube filled with an inert oxygen free atmosphere. Tiny connecting leads protrude from either end. These leads extend into the tube and overlap one another with a separation of a few thousandths of an inch. The leads are made from a ferrous material that is influenced by a magnetic field. They are first plated with gold as a base material, then with rhodium and ruthenium. Ruthenium is the best contact material known.
SPECIFICATIONS it possible to select any degree of frequency response from flat, to full loudness compensation. The overall gain of the loudness circuit is 14dB, which remains constant at mid frequencies, regardless of the position of the loudness control. The frequency compensation increases from the reference gain, and the desired amount of loudness compensation can be selected at any volume control setting.
STEREO POWER OUTPUT 100 watts into 4 ohm loads minimum sine wave continuous average power output per channel, both channels operating. The output RMS voltage is: 20 V across 4 ohms RATED POWER BAND 20 Hz to 20,000Hz FREQUENCY RESPONSE +0. -0.5dB from 20Hz to 20.000HZ TOTAL HARMONIC DISTORTION 0.005% maximum harmonic distortion at any power level from 250 Milliwatts to rated power output. INTERMODULATION DISTORTION, SMPTE 0.
SPECIFICATIONS INPUT IMPEDANCE Phono: 47K ohms and 65pF Capacitance High Level: 22K ohms TONE CONTROLS Bass and Treble, variable 12dB boost to 12dB cut AC POWER OUTLETS 1 Switched 1 Unswitched POWER REQUIREMENTS 120 volts. 50/60, Hz. 5 Amps UL/CSA DIMENSIONS Front panel, 17-1/2 inches (44.5cm) wide. 5-3/8 inches (13.7cm) high, depth behind front panel including clearance for connectors, 18-1/8 inches (46cm). Knob clearance required in front of the mounting panel, 1-1/8 inches (2.9cm).
CUSTOM INSTALLATION DIAGRAM SUPPORT SHELF VENTILATION CUTOUT IN MOUNTING SHELF MOUNTING SURFACE OUTLINE OF UNIT 25
The letters and numbers correspond to the paragraphs on pages 6-10 and 13-18.
