McIntosh C55
Image source — © McIntosh
What is it?
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Model name
C55
Analog inputs (balanced)
3
Analog inputs (single-ended)
4
Analog outputs (balanced)
3
Analog outputs (single-ended)
N/A
Gain (dBu)
64
Input sensitivity (mV)
900 (XLR) + 450 (RCA)
Output voltage (V)
16 (XLR) + 8 (RCA)
Input impedance (balanced) (Ω)
44 000
Input impedance (single-ended) (Ω)
22 000
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
N/A
Maximum output level (balanced) (dBu)
N/A
Maximum output level (single-ended) (dBu)
N/A
Volume control range (dBu)
N/A
Frequency response low +/- 3dB (Hz)
15
Frequency response high +/- 3dB (Hz)
100 000
Signal to Noise Ratio (SNR, unweighted) (dB)
100
Total Harmonic Distortion + Noise (THD+N) (%)
0.005
Dimensions (mm)
444.5 x 194 x 419
Weight (kg)
12.5
Official link
The device has a new removable DA2 module, where all digital inputs and associated signal processing circuits are assembled in a single place. The idea is for the user to easily replace the board as digital audio formats evolve, without having to replace the entire preamp.
In addition to the digital-to-analog converter (and the McIntosh C2700 has a very good one - proprietary Quad Balanced technology, ready to work with signals up to DSD512 and DXD 384 kHz), there is also a Dolby and DTS spatial sound decoder with stereo conversion. Thus, the device will work perfectly with movie sound, easily integrate into a home cinema (there is a Home Theater Pass-Through mode), and also interface with TV via HDMI ARC.
The device has 2 XLR, 3 RCA inputs, a phono corrector module (MM/MS), a pair of coaxial, a pair of optical connectors and a USB interface. There is also an on-board MCT connector for communication with McIntosh transports. The digital-to-analog converter of the model uses chips in Quad Balanced mode and accepts signals up to PCM 32/384 and DSD256.
It has a built-in universal phono corrector for pickup heads with a movable magnet and a movable coil, a headphone amplifier, and also provides the ability to install an optional DA2 digital module. The circuit is traditionally based on four 12AX7 triple triodes hidden in branded protective cages.
There is no built-in DAC and wireless modules, but there is traditionally an excellent phono corrector for heads with a movable magnet and a movable coil (MM/MS), which allows you to adjust the capacitance and resistance values for different pickups. The device is built on one 12AT7 lamp and five 12AX7A lamps, which can be observed by looking at the device from above – all the vacuum elements are placed on the top panel.