McIntosh C48 Owner'S Manual Download Page 26

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Specifications

Frequency Response

+0, -0.5dB from 20Hz to 20,000Hz

+0, -3dB from 15Hz to 100,000Hz

Total Harmonic Distortion

0.002% from 20Hz to 20,000Hz

Rated Output (Main)

2.5V Unbalanced, 5V Balanced

Maximum Voltage Output

8V RMS Unbalanced, 16V RMS Balanced

Sensitivity (for rated output)

High Level, 450mV unbalanced, 900mV balanced

Phono MM, 4.5mV

Phono MC, 0.45mV

Signal To Noise Ratio (A-Weighted)

High Level, 100dB

Phono, 88dB

Equalizer Controls

Input Impedance

High Level, 22K ohms unbalanced, 44k ohms bal-

anced

Phono MM, 47K ohms; 50 to 750pF, in 50pF steps

Phono MC, 25, 50, 100, 200, 500 or 1,000 ohms;

100pF

Maximum Input Signal

High Level, 5V Unbalanced, 10V Balanced

Phono MM, 50mV

Phono MC, 5mV

Voltage Gain

High Level to Record Output: 0dB

High Level to Main Output: 15dB

Phono MM to Record Output: 40dB

Phono MC to Record Output: 60dB

Output Impedance

220 ohms

Headphone Load Impedance

100 ohms to 600 ohms

Digital Input Sample Rates

Optical: 16Bit, 24Bit - 32kHz to 96kHz

Coaxial: 16Bit, 24Bit - 32kHz to 96kHz

USB: 16Bit, 24Bit - 32kHz to 192kHz

24Bit, 32Bit - 32kHz to 96kHz

Power Control and Trigger Output

12VDC, 25mA

Power Requirements

Field AC Voltage conversion of the C48 is not pos-

sible. The C48 is factory configured for one of the

following AC Voltages:

100 Volts, 50/60Hz at 30 watts

110 Volts, 50/60Hz at 30 watts

120 Volts, 50/60Hz at 30 watts

220 Volts, 50/60Hz at 30 watts

230 Volts, 50/60Hz at 30 watts

240 Volts, 50/60Hz at 30 watts

Standby Power, less than 0.5 watts

Note: Refer to the rear panel of the C48 for the correct

voltage.

Overall Dimensions

Width is 17-1/2 inches (44.45cm)

Height is 6 inches (15.24cm) including feet

Depth is 18 inches (45.72cm) including the Front Panel,

Knobs and Cables

Weight

26.5 pounds (12.0 kg) net, 41 pounds (18.6 kg) in ship

ping carton

Shipping Carton Dimensions

Width is 27 inches (68.6cm)

Height is 12 inches (30.5cm

)

Depth is 25 inches (63.5cm)

-15

20 50 100 200 500 1k

2k 5k 10k 20k

FREQUENCY IN HERTZ

- 5

-10

+ 5

+10

+15

Summary of Contents for C48

Page 1: ...McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 2699 Phone 607 723 3512 www mcintoshlabs com C48 Audio Preamplifier Owner s Manual ...

Page 2: ...ed for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet 10 Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus 11 Only use attachments accessories specified by the manufacturer 12 Use only with the cart stand tripod bracket or...

Page 3: ...aboratory Inc 2 Chambers Street Binghamton New York 13903 Phone 607 723 3515 Fax 607 723 1917 The serial number purchase date and McIntosh Dealer name are important to you for possible insurance claim or future service The spaces below have been provided for you to record that information Serial Number ________________________________ Purchase Date _ _______________________________ Dealer Name _ _...

Page 4: ...t be applied until all the system components are connected together Failure to do so could result in malfunc tioning of some or all of the system s normal opera tions When the C48 and other McIntosh Compo nents are in their Standby Power Off Mode the Microprocessor s Circuitry inside each component is active and communication is occurring between them 3 Balanced and Unbalanced Inputs and Outputs c...

Page 5: ...e controlled by a new Multi Stage Precision Digitally Controlled Attenuator System with a tracking accuracy of 0 1dB Variable Rate Volume and Balance Controls The C48 Preamplifier s Volume and Balance Control Circuitry provides an ideal rate of change with control rotation Equalizer Controls with Bypass The Equalizer Circuitry provides 12dB of boost or cut at five different center frequencies When...

Page 6: ...ormation on the next page pertaining to installing the C48 into cabinets 17 1 2 44 45cm 13 1 4 33 66cm 17 1 8 43 50cm 3 16 0 48cm 13 16 2 06cm 10 9 16 26 83cm 14 1 2 36 83cm 2 5 08cm 1 15 16 4 92cm Front View of the C48 Rear View of the C48 Side View of the C48 6 15 24cm 5 3 8 13 69cm 4 5 8 11 75cm 4 13 16 12 22cm 16 1 2 41 91cm ...

Page 7: ...in maintaining all the system components at the coolest possible operating temperature A custom cabinet installation should provide the following minimum spacing dimensions for cool operation Allow at least 2 inches 5 08cm above the top 2 inches 5 08cm below the bottom and 1 inch 2 54cm on each side of the Preamplifier so that airflow is not obstructed Allow 20 inches 50 8cm depth behind the front...

Page 8: ... Rear Panel Connections for the C48 Audio Preamplifier is located on a separate folded sheet contained in the Owner s Manual Packet Refer to separate sheet Mc2B for the Rear Panel Connections Rear Panel Connections C48 Audio Preamplifer Rear Panel ...

Page 9: ...trol Connections 8 Connect a Control Cable from the C48 TUNER DATA PORTS Jack to the TUNER Data In Jack 9 Connect a Control Cable from the C48 CD DATA PORT Jack to the SACD CD Player Data In Jack 10 Connect a Control Cable from the C48 SRVR DATA PORT Jack to the Music Server Data In Jack 11 Connect any additional McIntosh Components in a similar manner as outlined in steps 8 thru 10 Sensor Connect...

Page 10: ...ertain McIntosh Disc Players Selects FM Tuner Operating Func tions and Track Selection on certain McIntosh CD Players Press to change broadcast bands on an external McIntosh Tuner con nected Select certain functions on a variety of McIntosh Components Switches the Trigger 1 and or 2 Power Control Jack s On Off refer to Setup Power Control TRIG 1 and TRIG 2 on page 15 for addi tional information No...

Page 11: ...er 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 p or Down q Push button to seek the next available station Press and hold a Channel Up p or Down q Push button to seek continuously from station to sta tion Volume Press the Up p or Down q VOLUME Push button to raise or lower the listening volume ...

Page 12: ...tons with indicators switch the Preamplifier Outputs 1 and 2 On or Off INFORMATION DISPLAY indicates the Sources Vol ume other Audio Settings Operational Functions and Setup Mode Settings EQualizer BYPASS Push button with indica tor when activated the audio signal bypasses the Equalizer Controls also used to enter and exit the Setup Mode TRIM Push button with indicator allows selection of various ...

Page 13: ...can be identified at any time by utilizing the Setup Mode 1 Press and hold the C48 Front Panel EQ BYPASS SETUP Push button to enter the Setup Mode 3 The number after the character V is the Firm ware number Refer to figure 2 4 To exit the Setup Mode press the EQ BYPASS SETUP Push button How to Operate the Setup Mode The Default Settings Chart below indicates the Func tion Name Default Setting and t...

Page 14: ... Level present at the RECORD OUT Jacks is unaffected by any changes in the Setup Level adjustment The level adjustments made are retained in permanent memory They can be changed during operation of the C48 by performing a Trim Level Procedure refer to page 19 for additional information 1 Rotate the INPUT Control to select the CD Input and adjust the VOLUME Control to the desired listening level 2 ...

Page 15: ...iggers 1 2 TUNER CD CD2 DVD AUX SRVR Rec PHONO MC PHONO MM Figure 10 LEVEL SRVR 2 5dB Min Max Figure 12 SETUP DISPLAY BRIGHTNESS 1 Passthru SETUP PASSTHRU Source OFF Figure 13 The C48 can be part of a Multichannel Sound System for SACD DVD Audio and Home Theater The Right and Left Front Channels from an Audio Video Control Center or Surround Decoder can Passthru the C48 and onto its associated Pow...

Page 16: ... Off with the C48 Trigger 1 and 2 are also reassignable to activate when the ACC ON OFF Push buttons on the Remote Control are used or when a given Input or Inputs are selected In the first example the Power Control Trigger 1 Output will be set to function via the Remote Control ACC Push buttons 1 Press and hold the EQ BYPASS SETUP Push button until the Setup Mode is active Then press the OUTPUT 2...

Page 17: ...mote Control Codes The Remote Control included with the C48 utilizes the NORMal McIntosh Control Codes The Second Set of Control Codes the C48 will respond to is referred to as the ALTernate Codes The ALTernate Codes are used when the C48 is used in the same location as another McIntosh Preamplifier and or A V Control Center This will prevent the Remote Control from affecting the operation of both...

Page 18: ...n the Re mote Control for the desired listening level Refer to figures 50 and 53 Trim Functions The C48 has six different Trim Selections with Ad justments The Trim Selections include Balance Trim Level Amplifier Meter Backlight Equalizer Mode Mono Stereo Mode and Digital Audio Display Info The Trim Settings are stored in memory indepen dently for each Input Source Selected the only exception be i...

Page 19: ...off the Equalizer Mode 2 Press the TRIM Push button repeatedly until EQUALIZER MODE ______ Enable appears on the Front Panel Information Display Refer to figure 61 3 Rotate the VOLUME ADJUST Control or press the LEVEL Push buttons to Bypass the Equalizer Mode Refer to figure 62 After approximately 4 seconds the Information Display returns to indicate the Source Selection and Volume Level MONO STER...

Page 20: ...l Audio Display is switched Off To display information about the type of digital signal present when any one of the five digital inputs is se lected perform the following steps 1 Select one of the Inputs assigned to an active digital source Note The USB D A Input may also be selected when the C48 is connected to a computer 2 Press the TRIM Push button repeatedly until DIGITAL AUDIO Display Info Of...

Page 21: ...CONTROL OUTPUT 1 OUTPUT 2 Jacks on the rear panel of the C48 To stop the Audio and Power Control Signals from going to the separate Power Amplifiers press the same Push button s a second time Headphones Jack Connect a pair of dynamic headphones to the Head phones Jack with a 1 4 0 635cm stereo phone type plug for private listening Press OUTPUT 1 and or 2 Push buttons to mute the Loudspeakers Note ...

Page 22: ...ivated it will automatically turn on when the A V Control Center or Surround Decoder is turned On It will indicate on the Front Panel Alphanumeric Display PASSTHRU Refer to figure 69 The C48 OUTPUT 1 OUTPUT 2 Front Panel Push buttons are active when in the Passthru Mode The other of the Front Panel Controls and Push buttons are deactivated as long as the Passthru Mode is active Optical and Digital...

Page 23: ...here is no Digital Signal present the display will indicate SI LENT Refer to figure 71 USB Input Operation with a Computer The C48 USB D A Input provides the capability to playback music from a computer when the computer is connected to the rear panel USB D A connector The C48 USB Input is compatible with both PC Computers using Microsoft Windows XP with Service Pack 3 Vista with Service Pack 1 an...

Page 24: ...24 ...

Page 25: ...25 Photos ...

Page 26: ...00 ohms to 600 ohms Digital Input Sample Rates Optical 16Bit 24Bit 32kHz to 96kHz Coaxial 16Bit 24Bit 32kHz to 96kHz USB 16Bit 24Bit 32kHz to 192kHz 24Bit 32Bit 32kHz to 96kHz Power Control and Trigger Output 12VDC 25mA Power Requirements Field AC Voltage conversion of the C48 is not pos sible The C48 is factory configured for one of the following AC Voltages 100 Volts 50 60Hz at 30 watts 110 Volt...

Page 27: ...ge Use 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 Service Depart ment of McIntosh Laboratory Refer to page 4 Please see the Part List for the correct part numbers Quantity Part Number Description 1 033838 Shipping carton only 4 033837 End cap 1 033836 ...

Page 28: ...ucts 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 mcintoshlabs com McIntosh Part No 04122800 ...

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