C48 Audio Preamplifier Owner's Manual - McIntosh

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How to Operate the C48Power On and OffThe Red LED above the STANDBY/ON Push-buttonlights to indicate the C48 is in Standby mode. Toswitch ON the C48, press the STANDBY/ON Pushbuttonon the Front Panel or the (Power On)Push-button on the Remote Control. The C48 will gothrough a brief startup initialization with the FrontPanel Information Display indicating the last usedsource and volume setting, this is followed by thevolume setting indication starting at zero and thenincreasing to the last used volume setting. Refer tofigures 50, 51, 52 and 53. To switch OFF the C48 pressthe STANDBY/ON Push-button on the Front Panel orthe OFF Push-button on the Remote Control.Note: For an explanation of the Remote ControlPush-button functions, refer to pages 10 and 11.SOURCE: CD115%Figure 51SOURCE: SERVER30%Figure 52Source SelectionRotate the INPUT Control to select the desired sourceor press the appropriate push-button on the RemoteControl. Refer to figures 50 and 53.Volume ControlRotate the Front Panel VOLUME Control or use theVOLUME Upp or Downq Push-buttons on the RemoteControl for the desired listening level. Refer tofigures 50 and 53.Trim FunctionsThe C48 has seven different Trim Selections withAdjustments. The Trim Selections include Balance,Trim Level, Amplifier Meter Backlight, EqualizerMode, Mono/Stereo Mode, Digital Audio Display Infoand Phono Cartridge Loading. The Trim Settings arestored in memory independentlyfor each Input SourceSelected, except the AmplifierIllumination and DigitalAudio Display settings of On orOff, which are the same for allinputs.Note: Selection and Adjustmentof all Trim Functions maybe performed using theFront Panel TRIM, OUT-PUT 1/ OUTPUT 2 / ◄MENU ► Push-buttonstogether with the VOL-UME/ADJUST Control.The Remote Control TRIMPush-Button together withthe LEVEL + / - Pushbuttonmay also beused. Refer to figures 50and 53.BALANCEListening balance varies withdifferent program sources,room acoustics and listeningpositions relative to the Loudspeakers.Use the Balance(Trim Function) as needed toachieve approximately equallistening volume levels in eachLoudspeaker. To adjust the Bal-Figure 53Figure 50BALANCE: 0 dB||Figure 5418
How to Operate the C48ance perform the following:1. Press the TRIM Push-button repeatedly on theRemote Control until “BALANCE 0 dB” appearson the Front Panel Information Display. Refer tofigure 54.Note: The Front Panel TRIM Push-button togetherwith the OUTPUT 1/ OUTPUT 2 / ◄ MENU ►Push-buttons may also be used.2. Rotate the VOLUME/ADJUST Control or press theLEVEL + / - Push-buttons on the Remote Controlto emphasize the Right Channel (refer to figure 55)or the Left Channel (refer to figure 56).BALANCE: 50 dB¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦Figure 55BALANCE: 50 dB¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦Figure 56The Front Panel Display indicates the Balance changesin steps from 0 to 50dB. After approximately 4seconds the Information Display returns to indicatethe Source Selection and Volume Level. To verify theBalance setting without changing it, use the TRIMPush-button and select Balance.TRIM LEVELThe Trim Level adjustments allow for making fineadjustments to the previously performed Trim LevelAdjustments (refer to the Setup Section of this Owner’sManual on page 14 for additional information). Tomake a fine adjustment to the currently selected InputSource perform the following:1. Select “TRIM LEVEL” as indicated on the FrontPanel Information Display. Refer to figures 50, 53and 57.TRIM LEVEL:Min ||Figure 572. Adjust the Trim Level to -2.5dB. Refer to figure58.TRIM LEVEL:Min ¦ ¦ ¦Figure 580.0dBMax-2.5dBMaxAfter approximately 4 seconds the InformationDisplay returns to indicate the Source Selection andVolume Level.METER ILLUMINATIONThe Front Panel Meter Illumination of recent McIntoshPower Amplifiers may be switched On or Off byperforming the following:1. Select “AMP METER BACKLIGHT, Lights: On”as indicated on the Front Panel Information Display.Refer to figures 50, 53 and 59.AMP METER BACKLIGHTLights: OnFigure 592. Switch On or Off the Amplifier Meter Illumination.Refer to figure 60.AMP METER BACKLIGHTLights: OffFigure 60After approximately 4 seconds the InformationDisplay returns to indicate the Source Selection andVolume Level.EQUALIZER MODEThe built-in five band Frequency Equalizer providesmore precise adjustment of sound than Bass andTreble Controls. By default the Equalizer is active forall Input Sources however, any Input Source may beassigned to bypass the Equalizer. To bypass the Equalizerfor a given Input Source, perform the followingsteps:Note: The audio signal present at the RECORD OUTJacks is unaffected by the Equalizer settings.1. Select the desired Input Source.2. Select “EQUALIZER MODE, ______: Enable” asindicated on the Front Panel Information Display.Refer to figure 61.EQUALIZER MODETUNER : EnableFigure 613. Set the EQUALIZER MODE to be either enabledor bypassed. Refer to figure 62.EQUALIZER MODETUNER : BypassFigure 62After approximately 4 seconds the InformationDisplay returns to indicate the Source Selection andVolume Level.MONO/STEREO MODEBy default the Stereo Mode is active for all InputSources however, any Input Source may be assignedto Mono Mode. To change Stereo Mode to Mono for agiven Input Source, perform the following steps:Note: The audio signal present at the RECORD OUTJacks is unaffected by the Stereo/Mono setting.19
Page 1 and 2: McIntosh Laboratory, Inc. 2 Chamber
Page 3 and 4: Thank YouYour decision to own this
Page 5 and 6: Introduction and Performance Featur
Page 7 and 8: InstallationInstallationThe C48 can
Page 9 and 10: Connecting ComponentsConnecting Com
Page 11 and 12: How to use the Remote ControlHow to
Page 13 and 14: SetupHow to Operate the Setup ModeY
Page 15 and 16: Setup, con’t4. Rotate the INPUT C
Page 17: Setup, con’tComm Port Baud RateTh
Page 22: How to Operate the C48, con’tThe
Page 26 and 27: SpecificationsSpecificationsFrequen

C48 Audio Preamplifier Owner's Manual - McIntosh

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