PRECISION STEREO CONTROL CENTER

C-2300Accuphase Laboratory, Inc.

1The new C-2300 is an entirely new model that integrates the C2000 series, the standard for separate systems, and the C-2400
series, which has gained tremendous support from music lovers as
a middle-class pre-main amplifier.
C-2300 has the "Balanced AAVA" volume control circuitry in thehigher-end C-2900.

In addition to the low and high frequencies, a new 4-band tone
control allows adjusting the mid-low and mid-high frequencies,
providing greater flexibility in adjusting the bandwidth balance.
Expandability is also enhanced with two slots for the AD-60 Phono
equalizer board and the DAC-60 Digital input board, making it
compatible with various sound sources.
Enjoy your favorite music to your heart's content with C-2300,
which has evolved by combining outstanding circuit technology
with new features!
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Dimensions and weight• Almost the same size as current preamplifiers C-2450/C-2150
465 mm
405 mm

150 mm19.3 kgAccuphase Laboratory, Inc.

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Dimensions of C-2300 are not significantly different fromother preamplifiers
The weight of C-2300 is almost the same as C-2450 aswell.
**Weight of C-2450: 19.0kg

2All functions as a control center• Abundant input/output terminals and functions

Compensator characteristics

OUTPUT switch

PHASE switch and indicator

Accuphase Laboratory, Inc.

3C-2300 is equipped with all the functions required for acontrol center.
The input and output signals are typically in phase, but thephase can be inverted with the PHASE switch. The set phase isstored for each input terminal even after the power is turnedoff, so there is no need to redo the setting.

The EXT PRE function, which can be switched with an external
preamplifier, is practical when this unit is integrated into ahome theater system.
The COMPENSATOR function raises the volume of the lowfrequency range when listening at low volume to improve theaudible energy balance and compensate for the lack ofvolume in the low-frequency range.

3All functions as a control center• A 4-band tone control
500Hz

2kHz

8kHz/20kHz

Level [dB]

40Hz/125Hz

Frequency[Hz]Selectable Tone switch
Frequency Control

Accuphase Laboratory, Inc.

4C-2300 also has a 4-band tone control circuit that caneffectively adjust the bandwidth balance of the music signal.
Considering the sound quality, the circuit uses an additive
active filter in full-fledged graphic equalizers.
500Hz is effective for adjusting the strength of rhythm
instruments, and 2 kHz is effective for changing theexpressiveness of vocals.
In addition, the low-frequency range is selectable between
40Hz and 125Hz, and the high-frequency range between 8 kHz
and 20 kHz allows the overall energy balance adjustment.

4Internal view
Rch Transformer

Chamber for
AD-60 / DAC-60
option board

Lch Transformer

Right channel
Balanced AAVAcircuit

Left channel
Balanced AAVAcircuit

Volume sensor

10,000μF Capacitor X 4Accuphase Laboratory, Inc.

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The quality of the power supply that supplies energy to theamplification circuitry significantly impacts sound quality.
This unit is equipped with two cased high-efficiency
transformers.
In addition, two large-capacity 10,000uF filter capacitors are
installed on each side to provide a generous power supply.

5Volume sensor mechanism• Distinguished operation feeling• Reduced mechanical and motor noise
Mounted withfloating mechanism
Custom made grease
DC motor8mm in diameter
extra-thick shaft

CNC machining
aluminum block

Accuphase Laboratory, Inc.

6The music signal does not pass the volume mechanism inAAVA and also balanced AAVA. It is just a position sensor to
set the sound volume.
However, the feeling of the volume knob is essential for audio
enthusiasts.
In the C-2300, the motor and the set of gears are mountedwith the floating mechanism, and with the custom-madegrease, the knob provides a smooth operation feel and superquiet volume adjustment.
The volume sensor mechanism is floated from the chassis toblock off the vibration with specially-made silicone rubbers.

6Ultra low noise• 10% lower than current model– Guaranteed S/N ratio: 111dB

6.3 μV

C-2450C-23005.6 μV
10% Down
Guaranteed Residual noise @ Volume Maximum, Input shorted

Accuphase Laboratory, Inc.

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The Balanced AAVA principle reduces the noise level in the C2300 to 10% lower than the former C-2450. It makes asignificant improvement in sound performance.

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Technology for ultra low noise• Balanced AAVA
– All signal paths including tone circuits are balanced
Current to voltage converter

Voltage to current converter

Input +

V/I+Output +Input -V/I-Output -Input amp withcurrent feedback

Balanced AAVA block diagram

Accuphase Laboratory, Inc.

8The AAVA (Accuphase Analog Vari-gain Amplifier) is a radicallydifferent volume control principle that eliminates all variable
resistors from the signal path.
C-2300 employs two AAVA modules in a fully balanced
configuration from input to output.
It’s called Balanced AAVA.

This breakthrough architecture minimizes the external orinternally-initiated noise by balancing the internal signaltransmissions.

8Technology for ultra low noise• All AAVA circuits made by discrete configuration• Independent amplifier structure
For balanced input

For V-I converter

For I-V converter

AAVA assemblies

Accuphase Laboratory, Inc.

9All AAVA Assembly boards have discrete and balanced
configurations to achieve ultra-low noise characteristics.
High-gained Balanced Input amp shows excellent noise
performance at high volume levels.

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Further more …
• Custom components for ultimate sound quality– Parallel output staged High-performance Headphone amplifier– High-quality cast iron insulator

High performance Headphone amplifier

High carbon cast iron insulator

RC-250
Remote Commander

Accuphase Laboratory, Inc.

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The C-2300 consists of many custom-made parts.
Discretely configured, high-quality headphone amplifier drives
every single headphone worldwide, with high output current
provided from the dedicated power source.
High carbon cast iron insulator is also a custom part for all
Accuphase products. It suppresses unwanted vibrations and bringsout the complete purity of the music.
An elegant and high-quality remote commander is supplied.

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