McIntosh MC257 Owner'S Manual Download | Manualshive

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McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 www.mcintoshlabs.com

MC257

Power Amplifier

Owner’s Manual

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Summary of Contents for MC257

Page 1: ...McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 2699 Phone 607 723 3512 www mcintoshlabs com MC257 Power Amplifier Owner s Manual...

Page 2: ...portant Additional Operation Information Guide Thank You and Please Take a Moment 2 Technical Assistance and Customer Service 2 Table of Contents 2 General Information 2 Connector and Cable Informatio...

Page 3: ...ced connections guard against induced noise and allow long cable runs without compromising sound quality Power Guard The patented McIntosh Power Guard circuit prevents the amplifier from being over dr...

Page 4: ...r your MC257 Dimensions Front View of the MC257 Rear View of the MC257 Side View of the MC257 17 1 2 44 5cm 8 7 8 22 5cm 9 7 16 24 0cm 11 3 4 29 9cm 16 13 16 43 0cm 18 1 4 46 4cm 3 16 0 5cm 16 5 8 42...

Page 5: ...r ating temperature A custom cabinet installation should provide the fol lowing minimum spacing dimensions for cool opera tion Allow at least 6 inches 15 24cm above the top 2 inches 5 08cm below the b...

Page 6: ...Mc Intosh Component POWER CONTROL IN ZA Zone A receives a turn On Off signal from a McIntosh component for all seven channels POWER CONTROL IN ZB Zone B receives a turn On Off signal from a McIntosh...

Page 7: ...lanced Audio XLR Connection Cables that come from the con nections on the Audio Preamplifier or A V Control Center Refer to the Connections on the separate folded sheets Mc1A Mc2A and Mc3A UnBal anced...

Page 8: ...her the 4 or 8 Ohm Setting to match the imped ance of the majority of the loudspeakers connected If the Loudspeaker s impedance is in between the available connections use the nearest lower impedance...

Page 9: ...9...

Page 10: ...ate when the POWER GUARD Circuitry has activated for Amplifier Channels Left Front LF1 Left Back LB2 Right Back RB3 Meter indicates the Front Left Channel Output of the amplifier Meter indicates the F...

Page 11: ...Refer to figure 10 To switch the MC257 OFF place the POWER Control in the OFF position MC257 Channel Operation There are several Channel Operation Modes The first operation mode is referred to as Zon...

Page 12: ...to make accurate readings The MC257 can deliver the best possible performance from any type of high quality loudspeaker system Refer to figure 15 Creating an amplifier with this level of perfor mance...

Page 13: ...e the very latest in semiconductor technology and incorporate a new design known as ThermalTrak Refer to figure 17 This allows for the instantaneous and accurate monitoring of the Power Transistor Tem...

Page 14: ...imi nates the possibility of ever overdriving the ampli fier into clipping Refer to figures 21 22 and 23 An overdriven amplifier can produce both audible and inaudible distortion levels exceeding 40 T...

Page 15: ...ectly into the wall outlet Also most owners desire one power switch for the whole audio system The MC257 is equipped with a circuit that provides remote Power Control from a McIntosh A V Control Cente...

Page 16: ...16...

Page 17: ...17 Photos...

Page 18: ...annel with all channels operating for any combination of frequencies from 20Hz to 20 000Hz Wide Band Damping Factor Greater than 70 at 4 ohms Greater than 140 at 8 ohms Input Impedance 20 000 ohms Bal...

Page 19: ...se the original shipping carton and interior parts only if they are all in good serviceable condition If a shipping carton or any of the interior part s are needed please call or write Customer Servic...

Page 20: ...cts is the policy of McIntosh Laboratory Incorporated who reserve the right to improve design without notice Printed in the U S A McIntosh Laboratory Inc 2 Chambers Street Binghamton NY 13903 www mcin...

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