McIntosh C55 2-Channel Solid State Preamplifier

The C55 Preamplifier is a pinnacle of sonic excellence designed for audiophiles, music enthusiasts, and dedicated McIntosh fans alike. As a torchbearer of innovation, it takes the baton from its predecessor, the multi award-winning C53, and propels your home audio experience into new realms of audio nirvana. With precision and craftsmanship, the C55 proudly takes its place as a true industry leader.

INPUTS IN ABUNDANCE

With a staggering 16 inputs (9 analog and 7 digital), the C55 becomes the nerve center of your audio universe. Analog inputs include 3 balanced and 4 unbalanced connections, along with 2 phono inputs configurable for either Moving Coil or Moving Magnet phono cartridges to connect your turntable(s). Both phono inputs feature adjustable Gain in 6dB steps from 40dB to 64dB as well as RIAA equalization.

The digital section is housed in our DA2 Digital Audio Module and is powered by an audiophile-grade Quad Balanced, 8-channel, 32-bit Digital-to-Analog Converter (DAC). The DA2 offers an array of connections, including an audio-only HDMI Audio Return Channel (ARC)¹ input, ushering your TV sound into a new era through your home stereo system. Dolby^® and DTS^® multi-channel audio formats are expertly converted to exquisite two-channel audio for a captivating listening experience.

The DA2's other 6 digital inputs consist of 2 coaxial, 2 optical, 1 USB, and 1 MCT. The USB input supports DSD512 and DXD 384kHz. The coax and optical inputs decode digital music up to 24-bit/192kHz for high resolution audio playback. And to get the best sound quality from the high definition audio on your SACD collection, the MCT input offers a secure, custom DSD connection when paired with our MCT series of SACD/CD Transports. The entire DA2 module is upgradeable and could be replaced by a future module should new digital technologies become available.

INNOVATIVE OUTPUTS FOR PERSONALIZED LISTENING

To connect the C55 to your power amplifier(s), there are 3 stereo sets of variable balanced and unbalanced outputs that offer advanced connection flexibility. All 3 sets of outputs can be active at the same time, and each can send the audio signal of the source component to 3 separate audio systems. 

Additionally, the Main output and Output 1 can be used for bi-amping a single speaker system via the built-in adjustable High Pass and Low Pass filters. In this setup, the High Pass outputs could be connected to a vacuum tube amplifier, and the Low Pass outputs could be connected to a solid-state amplifier. The adjustable crossover allows you to optimize the performance of your amplifiers to your speaker’s specifications and to your listening preferences. Output 1 offers trim level control, which allows two different amplifiers to be volume balanced when bi-amping.

Furthermore, Output 2 can be configured as either mono or stereo and can send audio signal to a stereo audio system in another room, to a single mono subwoofer, or to 2 separate stereo subwoofers.²

The Processor Loop is also the perfect place to connect an analog tape recorder, a high-end cassette deck, or a 3-head reel deck that allows you to record from a source component and hear the recording just seconds later so you can monitor your recordings.

Another benefit of adding the C55 to your network is the ability to receive periodic firmware updates. These firmware releases can add new features or provide important performance updates.

ADDITIONAL PERFORMANCE FEATURES

• 8-band analog equalizer to fine-tune your music with precision, creating a personalized audio experience (the equalizer can be bypassed if desired).
• High Drive Headphone Amplifier with Headphone Crossfeed Director (HXD^®) technology brings an added dimension to headphone listening.
• Home Theater PassThru for seamless integration into your home theater system.
• Has received Roon Tested designation from Roon Labs. 
• Power Control lets you easily turn other connected McIntosh components on and off.
• Data Ports can send remote control commands to connected source components.
• Electromagnetic Input Switching for reliable, noiseless, and distortion-free switching. 
• Level Trim Adjustment for matching analog input levels to prevent abrupt changes in volume levels.
• Precision balanced, digitally controlled attenuator system for accurate volume control with 0.1dB accuracy.
• Fully regulated power supplies and a special R-core power transformer for stable, noise-free operation.
• Eco-friendly Power Management System that will turn the unit off after 30 minutes of inactivity (can be disabled).

ELECTRONIC SPECIFICATIONS

• Number of Channels 2

• Total Harmonic Distortion 0.005%

• Frequency Response +0, -0.5dB from 20Hz to 20kHz
  +0, -3dB from 15Hz to 100kHz

• Maximum Volts Out (Balanced / Unbalanced) 16V RMS / 8V RMS

• Sensitivity High Level (Balanced / Unbalanced) 900mV / 450mV

• Sensitivity Phono (Moving Coil) 0.45mV

• Sensitivity Phono (Moving Magnet) 4.5mV

• Signal To Noise Ratio (High Level) 100dB

• Signal To Noise Ratio (Moving Coil) 80dB

• Signal To Noise Ratio (Moving Magnet) 82dB

• Voltage Gain (High Level) 15dB

• Voltage Gain (Moving Coil) Selectable 40dB, 46dB, 52dB, 58dB, or 64dB

• Voltage Gain (Moving Magnet) Selectable 40dB, 46dB, 52dB, 58dB, or 64dB

• Input Impedance (Balanced / Unbalanced) 44K ohm, 22K ohm

CONNECTIVITY

• Balanced Input 3

• Unbalanced Input 4

• Phono Input Moving Coil Up to 2 (unit has 2 Phono inputs; each is user configurable as either Moving Coil or Moving Magnet)

• Phono Input Moving Magnet Up to 2 (unit has 2 Phono inputs; each is user configurable as either Moving Coil or Moving Magnet)

• Upgradeable Digital Audio Module Yes: DA2

• Digital Coaxial Input 2

• Digital Optical Input 2

• Digital MCT Input 1

• Digital USB Input 1

• HDMI (ARC) Input 1

• Digital AES/EBU Input 0

• Balanced Fixed Output 0

• Balanced Variable Output 3

• Unbalanced Fixed Output 0

• Unbalanced Variable Output 3

• Headphone Output 1/4" High Drive with Headphone Crossfeed Director (HXD^®)

• Input Level Match Yes, +/- 6dB

• Home Theater PassThru Yes

• Unbalanced Analog Connector Type Premium gold-plated solid brass

• Service Port 1

• Network Connection 1

CONTROL

• Tone Controls 8-band (each band adjustable ± 12dB )

• Tone Bypass and Input Assign Yes

• RS232 Control Input Yes

• Power Control Output 1 Main, 4 Trigger

• Rear Panel Data Port 6

• Rear Panel IR Sensor Input Yes

GENERAL SPECIFICATIONS

• Multi-Chassis or Single Single, two-layer

• Output Meters Yes

• Vacuum Tube or Solid State Solid State

• Power Consumption (On) 75 Watts

WEIGHTS & DIMENSIONS

• Unit Dimensions (W x H x D) 17.5" (44.45cm) x 7.625" (19.4cm) x 16.5" (41.9cm)

• Unit Weight 28 lbs (12.5 kg)

• Shipping Weight 43.5 lbs (19.7 kg)