24dB per octave low pass filter with variable corner frequencies from 40Hz to 120Hz. • Subsonic Filter The selectable frequency Subsonic Filter prevents the amplifier circuitry from amplifying non audible signals and thus wasting amplifier power. • Power Guard and Sentry Monitor The Patented McIntosh Power Guard Circuit prevents the amplifier from being overdriven into clipping with its harsh distorted sound that can also damage your valuable loudspeakers. McIntosh Sentry Monitor power outpu

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 (servic

Cooling fan speed is controlled by temperature sensors attached to the interior of the extruded aluminum cooling tunnel. The fan is normally off. When needed, the fan will automatically switch on, and speed is increased as needed for additional cooling. • Fully Discrete Design The MCC204 has a fully complimentary double balanced amplifier design and is identical to that found in McIntosh’s leading home amplifiers. • Balanced Inputs with Pass Through The Balanced Inputs cancel out interferenc

2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3S12 FAX: 607-724-0S49 ÏÏMntosh 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 bottom cover. No user serviceable parts inside. IMPORTANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT. General: 1. Read these instructions

Connect the Coax Cable between the R649 and the “F” Connector on a McIntosh A V Control Center, Preamplifier, Multizone Controller or Integrated Amplifier. Up to four sensors can be connected in parallel. When the R649 is used with a McIntosh A/V Control Center that uses a Five Pin Terminal Connector, connect the Center Wire to Pin 4 and the Shield to Pin 5. Note: Before connecting the R649 to a McIntosh A/V Control Center, Preamplifier, Multizone Controller or Integrated Amplifier, make sure t