The C03X preamplifier as the embodiment of ESOTERIC technologies, enriches the musical experience of your system to a dramatic extent.
How far can a high quality preamplifier evolve the musical experience of a system?
The ESOTERIC’s C03X is indeed a definitive starting point when considering an answer to the proposition.
This brand new full balance dual-mono preamplifier brings out fantastic sonic impressions with seamless, stress-free beautiful sounds.
This comes as a fruitful result of ESOTERIC’s analog audio technologies accumulated over many years of dedicated research.
Here is the newest preamplifier in ESOTERIC’s “Master Sound Works” series.
Their new 3D optimised chassis features a four compartment structure.
Each circuit block is housed in its own compartment so as to place them three dimensionally.
This structure greatly contributes to reducing mutual interference between circuits and provides the shortest signal path.
Thick aluminum is used for the exterior.
The 5mm-thick steel bottom chassis is supported at four points using ESOTERIC’s proprietary ‘Pinpoint Foot’ (patent number: JP4075477).
Vibrations have been suppressed effectively and high rigidity has been achieved.
Adding the C03X to the system will provide an aesthetic integrity to the system. The front, top and side panels along with the front corners are made of thick aluminum.
The rounded shape of the top panel and the corners, where there are no screws at all, are inherited designs from the separate component system of the ESOTERIC flagship line.
The dual-mono design enables the C03X to have a power source and a power transformer for each of the right and left channels.
This was done in order to eliminate mutual interference between the channels and to prevent noise being introduced from the power line. Pure and clean amplification is the great outcome.
A Fully-Balanced Conﬁguration Gives an Excellent S/N Ratio C03X
Signals are received through the fully-balanced input buffer ampliﬁer design for an individual input system and maintains this balanced transmission at low impedance, so that all inputs can remain free from common mode noise.
This fully-balanced conﬁguration increases the purity of signal transmission and provides an absolutely excellent audio S/N ratio.
ESOTERIC-QVCS (*) is a volume control system, which takes full advantage of unit’s pure signal paths.
By turning the volume knob, the gain variable volume of all the four circuits – right and left channels, positive and negative powers – are activated.
In this way, this system keeps audio signals independent (from right to left and from positive to negative), so that sounds are reproduced clearly with good channel separation and accurate phase characteristics.
Furthermore, the deletion of cabling from the audio board to the volume device radically shortens the audio signal path and minimizes sound deterioration.
As a result, the C03X can now reproduce sounds that are perfectly suitable for a high-end preampliﬁer.
QVCS: Quad Volume Control System
Low Noise Operation
The control board for the entire ESOTERIC-QVCS is physically separated from the audio circuit and also electrically isolated using a photo coupler. The circuit design has also taken measures to make sure that microcomputer noise is not introduced into the audio path. This is accomplished by disabling the microcomputer until a function is initiated.
Low Impedance, High Response Power Circuit (Three Transformers)
Three different transformers for the three different power sources – the audio circuits of both the right and the left channels along with the control section – combined with large capacitors make this extremely clean low impedance and high response power circuit possible.
ESOTERIC’s Own Output Buffer Circuit with Fortiﬁed Current Transmission Enhances the Driving Performance of the Power Ampliﬁer
Looking at the subtleties of the signal transmission between preampliﬁer and power ampliﬁer, the ability of the component to transfer current efﬁciently determines the overall quality of the system.
The pre-ampliﬁer plays a signiﬁcant role in this relationship. Serving as a line driver, it should fully drive the power ampliﬁer to its maximum level to thoroughly convey music signals that can include such a broad range of music expression, from pianissimo to fortissimo.
What is required here is high performance via high speed current transmission.
For the purpose of attaining the ultimate performance of the C-03X as a line driver, the output buffer ampliﬁer circuit uses high quality materials and has its own board separate from the input stage.
The output buffer circuit provides the high performance necessary. Its slew rate, representing response speeds of 2,000 V/microsecond – is incredibly fast.
Since this buffer circuit is provided to each RCA output terminal and to the hot and the cold pins of the XLR output, the instant current supplied gets maximized.
The C03X re-enacts the breathtaking reality of music, whose dynamism tended to disappear in older systems during smaller current transmissions between the preampliﬁer and a power ampliﬁer.
*HCLD: High Current-capacity Line Driver
Gain per input is widely adjustable with a precision of +/-18 dB = 0.5 dB per step. This reduces volume variations from source to source.
Volume balance between the right and left channels is adjustable with a precision of +/-6 dB = 0.5 dB per step.
The output phase invert function allows an output that is appropriate for the power amplifier used. In addition, it is possible to individually determine a source-specific output phase and to easily implement phase management for the system.
Unbalanced output (RCA), balanced output (XLR) and RCA + XLR simultaneous output are the options.
RCA-2 terminals are provided to switch between normal line output and AV through output. This function allows you to connect AV preamp, sharing the same front two-channel speakers (and its dedicated amplification system) between music and surround movie applications.
Source equipment names can be programmed into the system using the remote controller.
Display dimmer, mute, auto-display-off functions are also available.
|ANALOG AUDIO INPUTS C03X|
|Connectors||RCA x 3 pairs (RCA 2 can be used as an AV pre-input )
XLR x 2 pairs
|Input impedance||LINE : 10 kOhms|
|Input sensitvity||At rated output : 510 mV
At 800 mV output : 200 mV
|Maximum input level||12 V|
|ANALOG AUDIO OUTPUTS C03X|
|Connectors||RCA x 2 pairs
XLR x 2 pairs
|Output impedance||RCA: 47 Ohms
XLR: 100 Ohms
|Maximum output level||7.5 V ( RCA output, 1kHz, 0.003%)
15V ( XLR output, 1kHz, 0.003%)
|Frequency response||1Hz – 200 kHz ( -3 dB )
3Hz – 50 kHz (-0.2 dB)
|S/N ratio||116 dB ( 2 V input, A-weight )|
|Total harmonic distortion||0.0006% (RCA)
0.0004% ( XLR)
|Rated output||2 V|
|Power supply||AC 230V, 50Hz ; AC 120V, 60Hz ; AC 220V, 60Hz|
(W x H x D, including protrusions)
|445 x 131 x 378 mm
(17 5/8˝ x 5 1/4˝ x 15˝ )
|Weight||22 kg ( 48 5/8 lb)|
|INCLUDED ACCESSORIES C03X|
|Power cord set x 1; Remote control (RC-1156) x 1; Batteries for remote control (AA) x 2; Felts x3; Owner’s manual x 1; Warranty card x 1|