User manual MCINTOSH MA6400

[. . . ] MA6400 INTEGRATED AMPLIFIER MA6400 INTEGRATED AMPLIFIER IMPORTANT SAFETY INSTRUCTIONS THESE INSTRUCTIONS ARE TO PROTECT YOU AND THE MclNTOSH INSTRUMENT. 4. Read all instructions - Read the safety and operating instructions before operating the instrument. Retain Instructions - Retain the safety and operating instructions for future reference. Follow Instructions - Follow all operating and use instructions. 5. [. . . ] DATA PORTS The DATA PORTS provide data signals to be fed to compatible audio and video accessory components. This allows you to control the accessory components with their own remote controllers transmitting to the MA6400 IR sensor. The SUM DATA port is used for connecting to the optional Mclntosh Model RCT-2 Remote Control Translator. Any IR signal transmitted to the MA6400 sensor results in data signals at this port. The RCT-2 is a learning device that will allow the MA6400 to remotely control most major brands of accessory components. The VIDEO DATA port connects to the optional Mclntosh MVS-3 Audio/Video Selector. This allows the MA6400 to select and switch up to five Audio/Video signal sources and a TV monitor connected to the MVS-3. All cables connected from the DATA ports use single conductor shielded wire with 1/8" mini phone plugs. PWR AMP IN (Left and Right); PWR AMP INPUT/ EXTernal-INTemal (Switch) Set the PWR AMP INPUT switch to EXT to allow an external signal source or preamplifier to feed signals directly to the MA6400 power amplifier section through the PWR AMP IN connectors. This feature also allows you to add an additional signal processor or equalizer to the MA6400 system. When the PWR AMP INPUT switch is in the EXT setting, the MA6400 preamplifier and power amplifier sections are disconnected from each other and are completely independent. When the switch is set to the INT position, the MA6400 preamplifier section feeds signals directly to the internal power amplifier section. MAIN OUTPUTS Connect cables from the MAIN OUTPUTS to the inputs of an external power amplifier. This allows the MA6400 to feed signals simultaneously to both the internal power amplifier as well as an external power amplifier. If you wish to use the MA6400 preamplifier independently to feed 13 THE REAR PANEL AND HOW TO MAKE CONNECTIONS 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. 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. Connect a cable from the MA6400 Left channel TAPE 1 OUTPUT to the left channel high level input of a tape recorder. Connect a cable from the MA6400 Right channel TAPE 1 OUTPUT to the right channel high level input of the tape recorder. Connect a second tape recorder in a similar manner, to the TAPE 2 OUTPUTS. PROCESSOR FROM and TO An external signal processor can be added to the MA6400 that will affect only the SPEAKERS 1 and 2. [. . . ] The sensitivity of this circuit is 2. 5 millivolts for 100 watts at the SPEAKERS Outputs. The Tape Output source impedance of the phono preamplifier section is less than 100 ohms, and will drive a load impedance of 1000 ohms or higher. LOUDNESS AMPLIFIER High level signals feed into the preamplifier past the input and mode switching, through the volume control and then into the loudness amplifier. An integrated circuit operational amplifier is used with two separate feedback circuits. One feedback loop has flat frequency response, and the other loop has loudness compensation. [. . . ]