User manual MCINTOSH MA7000

[. . . ] Integrated Amplifier MA7000 Owner's Manual McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 FAX: 607-724-0549 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. WARNING - TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. To prevent the risk of electric shock, do not remove cover or back. No user-serviceable parts inside. IMPORTANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT. 1. Install in accordance with the manufacturer's instructions. [. . . ] This an example of a typical audio system, your system may vary from this, however the actual Loudspeakers would be connected in a similar manner. Connect the Loudspeaker hookup cables from a single Loudspeaker to the output terminals that match the impedance of the Loudspeaker, being careful to observe the correct polarities. Output impedance connections of 2 ohms, 4 ohms and 8 ohms are provided. If the Loudspeaker's impedance is in-between the available connections, use the nearest lower impedance connection. Connect the MA7000 Power Cord to a live AC outlet. WARNING: Loudspeaker terminals are hazardous live and present a risk of electric shock. Spade lug or prepared wire connection: Insert the spade lug connector or prepared section of the cable end into the terminal side access hole, and tighten the terminal cap until the cable is firmly clamped into the terminal so the wires cannot slip 9 Remote Control Push-Buttons LED illuminates during the time a remote command is sent to the MA7000 Turns AC Power ON or OFF to certain McIntosh Components when connected via the Data Port and any McIntosh Components connected to the ACC Power Control Jack Press to Power the MA7000 ON or OFF Press MODE to switch between Stereo and Mono Modes Press to Power ON the MA7000 Press to Power OFF the MA7000 Switches OFF the entire MA7000 System Use to select tuner presets, disc tracks or any numbered operation Selects AM Tuner Operating Functions and Disc Selection on certain McIntosh Disc Players Selects FM Tuner Operating Functions and Track Selection on certain McIntosh CD Players Press to review Tuner Station Presets and select certain functions on a variety of McIntosh Components Adjusts the volume level up or down Mutes the audio Selects On Screen Functions on a variety of McIntosh Components Selects a Disc Player, Music Server or Tape Recorder Function and also performs various functions on a variety of McIntosh Components Selects the FF (Fast Forward) or REWind Mode on a Disc Player, Music Server or Tape Recorder; tunes Up or Down the AM/FM Dial Selects one of the seven available Audio Sources Note: Push-buttons whose function is not identified above are for use with other McIntosh Products. 10 How to use the Remote Control How to use the Remote Control The supplied Remote Control is capable of directly controlling the functions of contemporary McIntosh Source Components connected to the MA7000 via the Data Ports. Input Source Selection Press the appropriate Source Push-button to select the desired program source. Mute Press the MUTE Push-button to mute the audio in all outputs except the REC OUTPUT. The MUTE LED above the push-button will flash on and off to indicate that Mute is active. To un-mute the audio, press the MUTE Push-button again. Mono Press the MONO Push-button to switch from Stereo to Mono for Monophonic listening. Disc, Server and Tape Functions Use these push-buttons to operate a DVD Player, CD Player, CD Changer, Music Server or Tape Recorder. Numbered Push-buttons Press Push-buttons 0 through 9 to access tuner station presets, tracks on discs or selections on a Music Server. Disc and Track Use the DISC and TRACK Push-buttons when a Disc Player or Music Server is being used. Tuner Push-buttons Press the AM or FM Push-button to select the desired broadcast band. Press and release the Channel Up or Down Push-button to move from station to station. Press and hold a Channel Up or Down Push-button to move continuously from station to station. Press +10 Push-button to start the automatic brief audition of each of the presets stored in the tuner memory. Press +10 Push-button a second time to stop on a station preset and exit the review process. Volume Press the Up or Down VOLUME Push-button to raise or lower the listening volume level. Note: The Record Signals present at REC OUTPUTS are not affected by volume changes. Pause Press the Pause Pushbutton to perform various functions on a variety of McIntosh Components. It will also pause the playing of a disc or tape player. The Pause Push-button will also allow for quick exiting from the active menu when in the setup mode. The Pause Push-button is also used as an Enter Push-button with some McIntosh components Acc On/Off Press ACC ON to turn the power ON or ACC OFF switches AC Power ON or OFF to certain McIntosh Components when connected via the Data Port and any McIntosh Components connected to the ACC Power Control Jack. 11 Front Panel Displays, Controls, Push-buttons and Jack Meter indicates the Left Channel Output of the amplifier LED indicates when the Left Channel Amplifier POWER GUARD circuit activates LED indicates when the Right Channel Amplifier POWER GUARD circuit activates VOLUME Control allows adjustment of the listening level for both channels BALANCE Control allows adjustment of the relative volume balance between channels The LEDs above the push-buttons indicate the current source selected. Equalizer Controls provide 12dB of boost or cut at the center frequencies indicated above each control Meter indicates the Right Channel Output of the amplifier Standby Power On Indicator Source Push-buttons select audio signals from seven inputs for listening Connection for low impedance dynamic headphones, for private listening OUTPUTS 1 and 2 Push-buttons with indicators, turn the Loudspeakers and Preamplifier Output 2 On or Off STANDBY/ON Push-button switches the MA7000 ON or OFF (Standby) and resets the microprocessors IR Sensor receives commands from a Remote Control MONO Push-button with indicator combines the Left and Right Channel signals for Monophonic Sound MUTE Push-button with indicator, mutes the audio from the Loudspeakers and Headphones 12 How to Operate the MA7000 How to Operate the MA7000 Power On The Red LED above the STANDBY/ON Push-button lights to indicate the MA7000 is in Standby mode. [. . . ] The Power Guard circuit is a waveform comparator, monitoring both the input and output waveforms. Under normal operating conFigure 16 ditions, 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%, the Power Guard activates the PG light and a dynamic electronic attenuator at the amplifier input reduces the input Figure 17 volume just enough to prevent any further increase in distortion. [. . . ]