PRECISION STEREO CONTROL CENTER● Balanced A AVA volume control ● 4-band tone control ● Quiet andsmooth volume sensor c onstr uction ● A mple inputs: 5 Line and 2
Balanced ● Independent power supplies and unit amplifiers for lef t
and right ● Phase setting memor y for each input ● Highly reliable
logic-controlled signal switching relays ● High-quality headphone amplifier● Additional option boards support digital signals and analog records

Balanced AAVA preamplifier combining sound quality and functionality
For more than half a century, Accuphase has continued its relentless pursuit of creating the ideal
volume control circuitry. The C-2300 preamplifier utilizes Balanced AAVA – the successor ofthe AAVA system – to control volume without sacrificing vibrancy in the source sound. A newly
added 4-band tone control enables fine adjustments to sound tone. Experience the sonic depth
from the combined sound quality and superior features the C-2300 provides.

Innovation ‒ Leading-edge technology■ Balanced volume control, Balanced AAVA
Conventional preamplifiers use variable resistors to adjust volume, which causes
contacts to deteriorate and creates grit while increasing noise at normal volumelevels. AAVA, however, produces multiple, widely varying signals from the input
signal and controls volume by changing the combination of those signals. Thisachieves minimum noise at all volume levels without any grit. The C-2300
incorporates “Balanced AAVA” consisting of balanced “AAVA” circuits, whichfurther reduces the noise level by approximately 10% over the C-2450.

＋＋−
Balanced
input

−＋−

AAVA

C-2450＋−
AAVA

Balanced
outputInput amplifier

Voltage-to-current converter amplifier 1

Voltage-to-current converter amplifier 2

Current-to-voltage converter amplifier

Balanced AAVA built with discrete circuit boards

C-230010% reduction

Noise level

Balanced AAVAAluminum
volume knob

■ Quiet and smooth volume sensor design
AAVA uses a volume sensor design to detect the position of the volume knob
and changes the combination of signals to adjust volume. Machined from analuminum block in an ultra-precise extrusion process, the C-2300 uses a volumesensor design developed in-house with hefty, rigid materials to achieve an utterlysmooth and solid operation feel when rotating the knob for extremely accurateposition detection. Operational sounds are subdued even when using the RemoteCommander, resulting in quiet and gratifying volume adjustment.

Remote Commander
operation drive motor
Solid brass
shaft (8 mm diameter)

Ultra-precise machined
aluminum block

Volume sensor

Sound quality – In pursuit of the highest quality audio■ Separate unit amplifiers forleft and rightMusic signal circuits like theAAVA contain five unit amplifiers.
By separating the left and rightchannels, the attention to detailin the unit amplifiers works tosuppress electrical interference
and prevent any negative impacts
on sound quality.

R ch

R ch amp
L ch amp

Power supply

Balanced AAVA

Power supply

Balanced AAVA

Expansion slot for
AD-60, DAC-60
or other option boards■ Separate power supplies for left and right channels
The power source driving the circuits can greatly affect sound quality. Eachside of this preamplifier features a high-quality transformer housed inside
its own case. The two 10,000 μF high-capacity, high-quality custom-madefiltering capacitors mounted on each side supply power with margins andare highly impervious to load fluctuations.

L chPower transformers

Filtering capacitors (10,000 μF × 4 pcs)

Volume sensor

Independent Balanced AAVA for the left and right channels

Advanced features❶ Line input and output connectors❸❹❺❻❼ ❽ ❾Low range (selectable)
40 Hz / 125 Hz

12Supplied RemoteCommander
RC-250

Low midrange High midrange
500 Hz2 kHz⓯
High range (selectable)
8 kHz / 20 kHz

840-4-8-12

10100

1k

10k

100k

Frequency (Hz)⓰ 4-band tone control
Level (dB)12

⓱ Headphone amplifier

Can also control
Accuphase CD players❷ Balanced input and output connectors❿ ⓫ ⓬ ⓭ ⓮Level (dB)

■ Balanced AAVA volume control■ Highly reliable logic-controlled signal switching relays■ Separate power supplies for the left and right channels■ Volume sensor design achieves a quiet and smooth
operation feel
■ Abundant inputs/outputs (5 line level inputs, 2 line leveloutputs, 2 balanced inputs, 1 balanced output)・・・・・・・・・・・・①②■ Line level and balanced EXT PRE inputs for connection ofan external preamplifier・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・③■ Output selection (ALL / LINE / BAL / OFF)・・・・・・・・・・・・・・・・・・・・・④■ Recorder selector (OFF / ON / PLAY)・・・・・・・・・・・・・・・・・・・・・・・・・・・・⑤■ Switchable overall gain (12 dB / 18 dB / 24 dB) ・・・・・・・・・・・・・⑥■ Left/right balance control with Balanced AAVA・・・・・・・・・・・・・・⑦■ MC/MM switching (when AD-60 / AD-50 / AD-30 /AD-20 is installed)・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・⑧■ Subsonic filter ON/OFF switching (when AD-60 is installed)・・・⑨■ MC load input impedance switching (when AD-60 isinstalled, 30 / 100 / 200 / 300 ohms)・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・⑩■ DAC input selector (when DAC-60 / DAC-50 / DAC-40
is installed) ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・⑪■ Individual phase setting for each input・・・・・・・・・・・・・・・・・・・・・・・・・⑫■ Stereo signal can be switched to monophonic operation・・・⑬■ Display mode selector・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・⑭■ 4-band tone control・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・⑮⑯(40 Hz / 125 Hz, 500 Hz, 2 kHz, 8 kHz / 20 kHz)■ Discretely configured, high-quality headphone amplifier
with parallel push/pull output stages ・・・・・・・・・・・・・・・・・・・・・・・・・・・⑰■ High-carbon cast iron insulators for superior vibration
damping・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・⑱■ Loudness compensator to adjust audible sonic balance・・・⑲■ Volume attenuator that can instantly reduce sound as low
as –20 dB⓲ High-carbon castiron insulators

840-4

Frequency (Hz)⓳ Loudness compensator
properties

Option Boards
Two option boards can be installed on the rear panel.
Three types of option boards are available.

DAC-60 Digital Input Board

High-performance DAC with two ES9016K2M chips from ESS Technology driven in parallel.
■ The input terminal can be selectedfrom the front panel (*2)

Samplingfrequencies

Input Signal

Digital device

Coaxial digital cable

USB

Fiber-optic cable■ The sampling frequency can bedisplayed (*2)

T V ＊1

USB cable
DAC-60＊1: Set TV digital audio
outputs to PCM signals.

2.8 MHz
5.6 MHz11.2 MHz *3

DSD

1 bit

PCM

32 to 384 kHz

32-bitOptical PCM

32 to 96 kHz

24-bitCoaxial PCM

32 to 192 kHz

24-bit*3: ASIO only

*2: When DAC-60 / DAC-50 /DAC-40 is installed

PC

Number ofbits

LINE-10 Line Input Board

AD-60 Analog Disc Input Board

Features a high-performance phono equalizer for playback of analog discs.
DAC-60● Supports MC and MM cartridges

AD-60● Load input impedance selection (MC only)● Subsonic filter

Option board installation example

Cartridge■ Conventional models are also supported

Digital Input
Board

DAC-50/DAC-40/DAC-30/
DAC-20/DAC-10

Analog DiscInput Board

AD-50/AD-30/AD-20/
AD-10/AD-9

MC66 dBGain
Input
Impedance
AD-60

Line Input Board LINE-9

SubsonicFilter■ MC/MM selection (*4), input impedance
selection (*5), and subsonic filter ON/OFF(*5) can be selected from the front panel.

MM40 dB

30 ohms
100 ohms
200 ohms
300 ohms

47 kilohms

25 Hz, –12 dB/octave*4: This setting is on the option board
with the AD-10 / AD-9.
*5: This setting is on the option board
with the AD-50 / AD-30 / AD-20 / AD-10 / AD-9.

LINE-10

Front Panel
Input selector

Power switch

Function display* See the previous page for
information on the controls
in the sub panel.

Provides anadditional
set of unbalanced line
level inputs.

Rear Panel
Volume control
Button for
knob
opening the sub panel

Compensator
Headphone
ON/OFF button
jackAttenuator
ON/OFF buttonLine input connectors
TUNER / CD / LINE 1, 2, 3

Option board
installation slots

Recorder connectors
Line output
PLAY / RECconnectors LINE 1, 2

Balanced outputconnectors BAL

Balanced input connectors
BAL CD / BAL

External preamplifier
input connectors LINE

AC power supply connector

External preamplifier
input connectors (Balanced)

Guaranteed Specifications
3 – 200,000 Hz +0 –3.0 dB
20 – 20,000 Hz +0 –0.2 dB
MM / MC
20 – 20,000 Hz ±0.3 dB★AD INPUT
0.005 %
Total Harmonic Distortion (20 – 20,000 Hz, at rated output, all input connectors)
Input sensitivity
Input connector
Input impedance
At rated output For 0.5 V output
BALANCED
252 mV
63 mV
40 kilohms (20 kilohms / 20 kilohms)
Input Sensitivity,
Input ImpedanceLINE
252 mV
63 mV
20 kilohms
2.5 mV
0.63 mV
47 kilohms★AD: MM / 40 dB★AD: MC / 66 dB 0.126 mV 0.0315 mV 30 / 100 / 200 / 300 ohms
BALANCED / LINE OUTPUT
2V50 ohms
Rated Output Voltage,
Output Impedance
252 mV200 ohms★RECORDER REC (at AD input)
Input shorted (A weighting)
Input connector
S/N ratio (EIA)
S/N ratio at rated output
S/N Ratio, Input
BALANCED / LINE111 dB108 dB
Converted Noise
80 dB
80 dB
★AD: MM / 40 dB
68 dB
80 dB
★AD: MC / 66 dB
7.0 V
BALANCED / LINE OUTPUT
Max. Output Voltage(Distortion: 0.005%, 1 kHz) RECORDER REC (at AD output)
6.0 V
BALANCED / LINE INPUT
6.0 V
60.0 mVMax. Input Voltage★AD MM / 40 dB INPUT(Distortion: 0.005%, 1 kHz)
3.0 mV★AD MC / 66 dB INPUT

Frequency
Response

BALANCED / LINE INPUT

Supplied accessories● AC power cord
● Audio cable with plugs AL-10, 1 m (39.4")

Minimum Load
Impedance
Crosstalk
Gain(Gain switching:18 dB)* ±6 dB GAIN switchingpossible for all modes
except REC OUTPUT

Loudness
compensation★6XEVRQLF¿OWHU
Headphone jack

BALANCED / LINE OUTPUT
RECORDER REC–74 dB / 10 kHz
INPUTOUTPUT
BALANCED / LINE
BALANCED / LINE
BALANCED / LINE
RECORDER REC
BALANCED / LINE
★AD MM: 40 dB
RECORDER REC★AD MM: 40 dB
BALANCED / LINE★AD MC: 66 dB
RECORDER REC★AD MC: 66 dB

600 ohms
10 kilohms
Gain
18 dB0 dB
58 dB
40 dB
84 dB
66 dB

+6.0 dB (100 Hz)
25 Hz
Suitable impedance
Output level–12 dB/octave
8 ohms or higher
2 V (40 ohms)–20 dB
Attenuator
120 V, 220 V, 230 V AC (voltage as indicated on rear panel)Powerrequirements
50 / 60 Hz
41 W (when option board AD-60 and DAC-60 are installed)
Power Consumption
Maximum dimensions Width 465 mm (18.3”) × Height 150 mm (5.9”) × Depth 405 mm (15.9”)

MassNetIn shipping carton

19.3 kg (42.5 lbs)
25 kg (52 lbs)

★ Indicates properties with the analog disc input board AD-60 installed.
● Remote Commander RC-250

Remarks★ This product is available in versions for 120/220/230 V AC. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.
★ The 230 V version has an Eco Mode that switches power off after 120 minutes of inactivity.
★ The shape of the plug of the supplied AC power cord depends on the voltage rating and destination country.

●The specifications and appearance of this product are subject to change without notice.

https://www.accuphase.com/

F2305Y

850-2237-00（B1） PRINTED IN JAPAN