Stereo Preamplifier: The McIntosh C47 is a versatile solid-state
stereo preamplifier with an expansive set of inputs (12 total inputs) to connect
virtually any of your analog and digital music sources.
The C47's multiple outputs have the
ability to drive multiple power amplifiers (sold separately). The McIntosh
preamplifier's reproduction is sonically transparent and absolutely
Classic McIntosh Design & Specially-Designed Power Supply: The C47 stereo preamplifier incorporates classic McIntosh design cues, including a black glass front-panel,
knobs, illuminated logo, and brushed aluminum end-caps.
Fully regulated Power Supplies
and a special R-Core Power
Transformer ensure stable noise free operation even though the power line
32-Bit/384kHz DAC: The
McIntosh C47 utilizes a 32-bit/384kHz DAC for exceptional high-resolution audio
reproduction. The C47's internal DAC (digital-to-analog converter) circuitry
is designed to decode 2-channel PCM (Pulse Code Modulation) and DSD (Direct
Stream Digital) Digital Signals.
Other digital audio signal format types than 2ch PCM or DSD will cause the
audio outputs of the C47 to
be muted and the front-panel LCD will indicate an error message.
Electromagnet Input Switching w/ Naming: Electromagnetic
input switching is used in McIntosh C47 preamplifier to switch the variety of
source components connected. Rather than the commonly-used mechanical switches
that will deteriorate with wear, electromagnetic switches are high tech
switching nodes that allow very long, trouble-free operation. The default Input
Names can be changed to match the name of the component connected to it or any
other custom name desired (up to 10 characters).
Analog Inputs: The McIntosh C47 Preamplifier is
fitted with balanced & unbalanced analog inputs, plus MM & MC phono inputs.
- Balanced & Unbalanced Analog Inputs: The McIntosh C47
Preamplifier is equipped with two balanced stereo XLR inputs and three
unbalanced stereo RCA inputs. The
Balanced Inputs allow the connection of a source component using longer
cable lengths without a loss in sound quality. The analog inputs can be
matched in level, preventing abrupt changes in volume levels.
- MM/MC Phono Inputs: The
C47 has two precision Phono Preamplifier
Circuits, one for Moving
Coil (MC) Phono Cartridges and the other for Moving Magnet (MM) Cartridges.
Both Phono inputs have
selectable loading (MC: 25-1,000Ω) / MM:
50-800pf). The Phono preamp circuits used provide the lowest
possible noise and distortion. The close tolerance resistors and capacitors
used in the RIAA Correction Equalization Circuitry provide an extremely flat
Digital Inputs: The McIntosh C47 Preamplifier features
optical & coax digital inputs, a USB-B input for computer audio, and a
proprietary MCT port for SACD playback.
- Optical & Coaxial Digital Inputs: The McIntosh C47 Preamplifier
is fitted with two optical (toslink) digital inputs and one coaxial (RCA)
digital input. The optical and coax digital inputs will decode 2ch stereo
PCM music files at up to 24-bit/192kHz for high resolution audio playback.
- USB-B Input: The McIntosh C47 can decode and play back high res
PCM & high fidelity DSD files from your Windows PC (7/8/8.1./10) or Mac (OS
10.6.8+) computer via its
USB-B input. The preamp's USB-B input will accept 2ch stereo PCM signals up
to 32-bit/384kHz and supports DSD64, DSD128 and DSD256 along with DXD
352.8kHz and DXD 384kHz. A Windows PC will require the installation of
McIntosh's USB Audio Window Driver (available on the McIntosh website).
- MCT Port: To enjoy the high definition audio found on SACDs
(16/24-bit; 32-192kHz), you
can connect the C47 to McIntosh's MCT450 SACD/CD Transport (958MCT450, sold
separately) via the MCT input on back of the preamplifier to create a secure
and custom DSD connection.
Analog Outputs: The McIntosh C47 Preamplifier is fitted with
balanced & unbalanced outputs, a front-panel headphone jack, and a fixed output.
- Balanced & Unbalanced Outputs: The McIntosh C47 is
equipped with two balanced stereo XLR outputs and two unbalanced stereo RCA
outputs. Balanced & Unbalanced Inputs & Outputs can be mixed. For example,
you may connect signal sources to Unbalanced Inputs and send signals from the
Balanced Outputs; or vise-versa. You can also use Balanced and Unbalanced
Outputs simultaneously, connected to different Power Amplifiers.
- Headphone Jack w/ HXD: The C47 offers a front-panel 1/4"
headphone jack for connecting a set of low-impedance (100-600Ω), dynamic headphones, so
you can enjoy your music in private.
The C47's Headphone Crossfeed Director Circuitry (HXD) improves the sound
localization for headphone
listening. HXD restores the directionality
component of the spatial sound stage normally heard
listening. You can choose for the preamp to mute the audio outputs when a
headphone is connected or have both the audio outputs and headphone jack
live at the same time.
- Fixed Output: The audio signal present at the stereo
RCA "FIXED OUT" jacks is unaffected by the preamplifier's equalizer
circuitry, so you can send an unaltered audio signal to another zone
Gold-Plated Connectors: The Input and Output connectors
contacts are gold-plated for superior corrosion resistance and high electrical
Home Theater Pass Through: When the C47 preamplifier is part
of a home theater or multichannel audio system, the Right and Left Front
channels from an AV processor or surround decoder can pass through the C47's
analog inputs/outputs and onto
its associated power amplifier.
Front-Panel & Remote Control:
On the front-panel of the preamplifier are Input & Volume rotary knobs,
Output 1 and Output 2 buttons, Tone button, Mute button, and Standby/On button.
The McIntosh C47 also includes an IR remote control for wireless
operation of the preamplifier. In addition, the remote operates other McIntosh
audio components. The IR remote offers the following button functions - Power
On/Off, Input Selection, Volume Up/Down, Setup/Menu, Numeric Keypad, and
- Precision Volume Control:
Volume levels are controlled by a precision balanced digitally
controlled attenuator system with an optical
encoder rotary control. This assures a 0.1dB tracking accuracy between
channels. There are 225 individual 0.5dB volume level steps with no noise as
the volume level is changed.
- Bass & Treble: Bass & treble tone controls allow for some
fine tuning of your audio sources.
The Bass & Treble controls provide
up to 12dB of boost or cut. The C47 remembers the Bass
& Treble Setting for each
- Balance Left/Right: You are also able to balance the output level
of the preamplifiers left & right output channels.
- Stereo/Mono Mode: By default the Stereo mode
is active for all input sources. However, any input source may be assigned
to Mono mode. Mono mode combines the Left and Right channel signals
for Monophonic Sound.
Fluorescent Display: The C47's
front-panel, fluorescent display indicates the
Volume/Balance Levels, and Setup Mode Selections. The display intensity is also
Custom Integration: The McIntosh C47 offers advanced
connectivity and control features often required for custom home integration
using premium control systems.
- Power Control Connectors:
The C47 has the ability to
automatically switch power
on or off to source
components via the Power Control
C47's "Main, "Trigger 1/2", and
"PASSTHRU" Output Jacks
(3.5mm) send power on/off signals (+12 volt/0volt) when connected to other
McIntosh source components. The
Power Control outputs can be assigned to activate when a given input or
output is selected.
- Data Ports: The C47's
four Data Out Ports (3.5mm) send remote
control signals to McIntosh source
components. These Data Port
connections allow for the remote operation of basic functions using the
C47's Remote Control.
- IR Input: The 3.5mm IR input allows the connection of an external
IR receiver. With an external
sensor connected to the C47, remote control operation of the system is
possible from another room and/or when the C47 is located in a cabinet with
the doors closed.
The signal from a connected external IR receiver
will have priority over the signal
from the preamp's front-panel IR sensor.
- RS-232C Port: The preamplifier's RS-232C port requires a 3.5mm
stereo minijack to a subminiature DB 9 connector cable (sold separately) to
transmit and receive RS-232 commands.
AC Power Cord + Auto Power Off: The McIntosh C47 stereo preamplifier
features a detachable AC power cord with 3-pole IEC connector. The C47 incorporates an Auto Off
feature, which automatically places the preamplifier into the Power Saving Standby/Off Mode after
approximately 30 minutes of inactivity or no audio signal.
Mounting Options: The McIntosh
C47 can be placed upright on a table or shelf, standing on its four feet. It
also can be custom installed in a piece of furniture or cabinet of your choice.
The four feet may be removed from the bottom of the C47 when it is custom
installed. Always provide adequate ventilation for your C47.
Allow at least 2" above the
top, 2" below the bottom, and 1" on each side of the preamplifier, so
that airflow is not