User manual MCINTOSH MC205

[. . . ] Power Amplifier MC205 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. [. . . ] Do not 8-5/16" MC205 Front Panel install the MC205 21. 11cm Custom Cabinet Cutout directly above a heat generating component such as a high powered amplifier. If all the compo6" nents are installed 15. 24cm in a single cabinet, Cutout Opening Cabinet a quiet running for Front Custom Mounting ventilation fan can Panel be a definite asset Opening in maintaining all for Ventilation the system components at the coolest possible operating MC205 Side View temperature. in Custom Cabinet A custom cabinet installation should provide the followCutout Opening for Ventilation ing minimum spacChassis Support 3-3/4" ing dimensions for Spacers Shelf 8. 57cm cool operation. Connect a power control cable from the McIntosh A/V Control Center Zone A Power Control Out to the MC205 POWER CONTROL ZA. When connecting Loudspeakers to the MC205 it is very important to use cables of adequate size, so there is little to no power loss in the cables. The size is specified in Gauge Numbers or AWG (American Wire Gauge). The smaller the Gauge number, the larger the wire size: If your loudspeaker cables are 50 feet (38. 1m) or less, use at least 14 Gauge. If your loudspeaker cables are 100 feet (76. 2m) or less, use at least 12 Gauge. Banana plug connection: Tighten the top portion of the terminal post and insert the banana plug into the opening at the top of the terminal. Refer to figure 7. Note: The use of Banana Plugs is for use in the United States and Canada only. 3. Prepare the Loudspeaker Hookup Cables that attach to the MC205 Power Amplifier by choosing one of the methods below: Bare wire cable ends: Carefully remove sufficient insulation from the cable ends, refer to figures 1, 2 & 3. If the cable is stranded, carefully twist the strands together as tightly as possible. Note: If desired, the twisted Figure 2 Figure 3 Figure 1 ends can be tinned with solder to keep the strands together, or attach spade lug and/or banana connector. 4. Connect the Loudspeaker Hookup Cables from the MC205 OUTPUT Terminals to the Loudspeakers, being careful to observe the correct polarities and channel designation. 5. Place the IMPEDANCE Switch to the position (4 ohm or 8 ohm) that matches the impedance of the connected Loudspeakers. In the event that some of the Loudspeakers in the system are of different impedance, use the impedance of the Left and Right Front Loudspeakers to set the IMPEDANCE Switch position. Connect the MC205 Power Cord to an active AC outlet. WARNING: Loudspeaker terminals are hazardous live and present a risk of electric shock. For additional instruction on making Loudspeaker Connections contact your McIntosh Dealer or McIntosh Technical Support. McIntosh A/V Control Center 8 How to Connect for a Five Channel System Left Front Loudspeaker Center Front Loudspeaker Right Front Loudspeaker + + + - To AC Outlet Left Surround Loudspeaker Right Surround Loudspeaker + + - 9 How to Connect for a Seven Channel System Caution: The supplied AC Power Cord should not be connected to the Rear Panel of the MC205 Power Amplifier until after the Loudspeaker Connections have been made. Failure to observe this could result in Electric Shock. 1. Connect Audio Cables from the Zone A Unbalanced Outputs of a McIntosh A/V Control Center to the MC205 INPUTS (Channels 1-5), making sure to match up the channel identifications between both units. 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 out. Connect a power control cable from the McIntosh A/V Control Center Zone A Power Control Out to the McIntosh Two Channel Power Amplifier Power Control Input Jack. Connect a second power control cable from the McIntosh two Channel Power Amplifier Power Control Output jack to the MC205 POWER CONTROL ZA Jack. When connecting Loudspeakers to the MC205 it is very important to use cables of adequate size, so there is little to no power loss in the cables. The size is specified in Gauge Numbers or AWG (American Wire Gauge). [. . . ] When the difference exceeds 0. 3% (equivalent to 0. 3% harmonic distortion), the Power Guard activates the PG light and a dynamic electronic attenuator at the amplifier input reduces the input volume just enough With Power Guard to prevent any further increase in distortion. The Power Guard circuit acts so fast that there are absolutely no audible side effects and the sonic purity of the music reproduction is perfectly preserved. The MC205 Power Amplifier with Power Guard is not limited to just the rated power output, but will Figure 17 actually produce distortion free output well above its rated power due to the McIntosh philosophy of conservative design. Power Supply Circuits To compliment the design of the MC205, there is a high current power supply for the five power amplifier channels. The very large Power Transfomer, has toroidal windings on a toroidal core and can supply over 35 amps of continuous current. [. . . ]