● AAVA volume control with newly developed ANCC feature ● Five line level and twobalanced inputs for optimum flexibility ● Recorder connection support ● Logic-control
relays for shortest signal paths ● Separate power supplies for left and right channels● Fully modular construction with individual left / right amplifier units ● Phase selection
function ● Tone controls ● Dedicated headphone amplifier ● Option board slots
provide additional versatility for digital input handling and analog record playback

Newly developed ANCC makes AAVA even better
The next-generation control center featuring latest technology.
The C-2150 for the first time combines a new topology called ANCC with the AAVA volume
control principle. As a result, music reproduction is supple, elegant and full of transparency, witha spatial expression capability that makes one forget the presence of any volume control circuit.
With a functionality level close to higher-end models and a versatile array of input and output
terminals, plus the choice of adding option boards, the C-2150 provides fully immersive music
enjoyment. This next-generation control center will satisfy even the most demanding music lover.

Innovation - The leading edge of technology■ AAVA operation principle is purely analog
AAVA converts the music signal into 16 differently weighted current streams(1 / 2, 1 / 22, ... 1 / 215, 1 / 216) which are combined according to the positionof the volume control knob, resulting in exactly the desired listening level.

■ How AAVA works
OutputAAVA unit amplifier and control
board with input buffer amp,
V-I converter, I-V converterand other circuitry

Output of 16 V-I converter
amplifiers is combined forvolume control action

0.5

0.4

0.3

Current ratio
0.2■ Drastic reduction of distortion and noise
ANCC: Accuphase Noise and distortion Cancelling Circuit
The C-2150 uses ANCC topology for the I-V converter amplifier, balanced output amplifier, and headphone amplifier. This innovative topology adds a sub-amplifier for effectively canceling noise in the main
amplifier circuit. The use oflow-noise technology in theβsub-amplifier (noise density:Feedback circuit
1.5 nV / √Hz) further enhances
the benefits of ANCC. By in- Input
Output－AMain amplifiercorporating ANCC in the I-VDistortion/
converter amplifier and thenoise
Avcancelingbalanced amplifier of thecircuit
AAVA section, a further drastic
Sub-amplifier
for cancelation
reduction in noise is achieved,
especially at low to medium■ Block diagram of ANCC
volume level positions.

0.1

0V-I converter amplifiers
enable finely graded control
1－
1－
1－
1－
1－
1－
1－
1－
1－
1－
1－
1－
1－
1－
1－
1－

16 types of V-I
converter amplifiers

2

1

22

2

23

3

24

4

Music signal isconverted into 16 types
of weighted currents

Input

25

526

627

7288210 1192 12102 13112 14122 15132 1614215

High reliability

Minimum value forcontrol current: 1 / 65,536

2916

Unit amplifiers■ Separate unit amplifiers for left and right
The C-2150 comprises five separate amplifiers: input buffer, V-I converter, I-V converter, output buffer,and headphone. These are configured as five separate circuit boards arranged on a motherboard,providing ample space for components and ensuring outstanding reliability and performance. Leftand right channels are kept completely separate to prevent unwanted electrical interaction.
OPTION 1
OPTION 2AAVA（Accuphase Analog Vari-gain Amplifier）

CD
TUNER

12LINE 1
INPUTSELECTOR

LINE 2122

LINE 3LEFT
CHANNELINPUTS

Balanced
OutputAmplifier

COMPENSATOR

PHASE
BUFFER

CD-BAL

LINE-BAL

1231−

RECORDER

I-V Converter

TONE＋BALANCEDOUTPUTLINE− 2TONE

EXT PREBALANCEDBUFFER−1

FEEDBACKOUTPUT
ADDER
BALANCEDAMPLIFIERADDER

EXT PRE

1215

UNBALANCEDLEFT
CHANNEL
EXT PREINPUTS

LINE 1LEFTCHANNELOUTPUTS

RECORDEROUTPUT

1216RECTONE CONTROL

V- I Converter

PLAY

LINE 2

HIGH-PASSFILTER

RECORDER

CPU

VolumeBalance
Attenuator

HEADPHONE
OUTPUT

TREBLE

LOW-PASSFILTERTONE CONTROLHEADPHONEAMPLIFIERBASS

OUTPUT

from RIGHT channel
RECORDER

RIGHT
CHANNEL

INPUT
SELECTOR

MODE

PHASE

REMOTESENSOR

Same as LEFT CHANNEL■ C-2150 Block Diagram

LEVEL
FREQ
DISPLAYCOMPENSATORTONEOUTPUT

EXT PRE

Advanced features■ Supplied Remote Commander
RC-230Allows volume adjustment
and input source switching.

Line input and output connectors

Balanced input and output connectors❶❷❸❹❺❶ Output selector for using an external preamplifier andswitching the output❷ Bass tone control knob
❸ Treble tone control knob
❹ Tone control on / off button❺ Bass control frequency selector button❻ Treble control frequency selector button❼ MC / MM selector button for gain switching according
to the phono cartridge type when AD-50, AD-30 orAD-20 is installed

❻❼

❽

❾

● Left / right balance control knob❽❾
● Gain selector for overall system gain
Recorder selector for function switching when arecorder is connected
Phase selector button for input signal
Mono / stereo selector button for combining left / rightchannel signals
Display mode button for level / frequency display on /off and switching
DAC input selector button for use when digital input
board (DAC-50 or DAC-40) is installed
16Boost12100 Hz40 Hz

TREBLE
8 kHz
20 kHzHigh frequency
range

0−4−8−16
10High-capacitance aluminumelectrolytic capacitors

BASS

4−12Separate power transformers forleft and right

Low frequency
range

8Response in dBCut■ Logic-control signal switching relays for
shortest signal paths■ Five line level and two balanced inputs■ Line input and output connectors for a recorder■ EXT PRE function allows use of external preamplifier■ Individual phase setting for each input■ Stereo signal can be switched to monophonicoperation■ Instrumentation amplifier principle for input
buffer■ AAVA also adjusts left / right channel balance■ AAVA circuitry uses thin-film resistors to minimize thermal fluctuations and current noise■ Convenient attenuator is useful for example
when operating an analog record player■ Loudness compensator enhances low endpresence■ Tone controls using summing active filters■ Dedicated headphone amplifier using ANCC
for optimum sound quality■ Maximum gain can be set to 12 dB, 18 dB, or 24 dB■ Separate power supplies for left and rightchannels prevent mutual interference■ On / off switching capability for level / frequency
display■ Champagne-gold front panel and high-gloss
side panels■ Two option board installation slots■ DAC input selector button for use when digital
input board (DAC-50 or DAC-40) is installed■ Numeric indication of digital signal samplingfrequency (when DAC-50 or DAC-40) is installed)BASS

TREBLE

Adjustment range

Adjustment range

10010k1kFrequency in Hz

Tone control characteristics

100k

Option Boards
Up to two option boards can be inserted into dedicated slotson the rear panel. Three types of option boards are available.

Digital Input Board DAC-50
High-performance DAC with two
AK4490EQ chips from Asahi Kasei
Microdevices driven in parallel.

Coaxial digital cable

Digital component

Input Signal

Computer

DAC-50can be selected with a button
Number ■ Input
on the front panel ＊2of bits

DSD

2.8224 MHz
5.6448 MHz11.2896 MHz ＊1

1PCM

32 to 384 kHz

32

Optical PCM

32 to 96 kHz

24Coaxial PCM

32 to 192 kHz

24USB

Optical fiber cable
USB cable

Samplingfrequency■ Sampling frequency display
supported ＊2＊1 ASIO only

＊2 When DAC-40 / DAC-50 isused

Analog Disc Input Board AD-50
DAC-50Features a high-performance phonoequalizer for playback of analog records.

AD-50● Supports MC and MM cartridges● Subsonic filter■ Older option board models are also supported
DAC-10 / DAC-20 / DAC-30 / DAC-40

Analog DiscInput Board

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

Line Input Board

LINE-9Provides anadditional set of
unbalanced line
level inputs.

● MC load impedance selector button

Option board installation example

DigitalInput Board

Line Input Board LINE-10■ MC or MM can be selected with abutton on the front panel ＊3

Cartridge
Gain

AD-50

Inputimpedance

MCMM
66 dB
40 dB
30 ohms
100 ohms 47 kilohms
300 ohms

Subsonic filter

25 Hz: –12 dB / octave＊3 With the AD-9 / AD-10, the setting
is made on the board.
LINE-10

Front Panel
BASS/TREBLE
tone controls

Rear Panel
RECORDER connectors

MC/MM selector button

Input selector

Function display

Volume control

Headphone jack
Attenuator button
Loudness compensator
buttonButton for opening sub panel
Recorder selector
Gain selector
Balance control

Power switch
Opening sub panel
Output selector
Phase selector button
Mono / stereo selector button
Display mode selector button
DAC input selector buttonLine output connectors

REC / PLAY

Option board
installation slots

LINE 1, 2External preamplifier(Line) input connectors

Line input connectors

TUNER / CD / LINE 1, 2, 3

Balanced input connectors

EXT PRE INPUTS (LINE)

External preamplifier(Balanced) input connectors

CD-BAL / BAL

EXT PRE INPUTS (BAL)

Balanced output connectors
BAL

AC power supply connector ★
With line input signal: Pin ② (–), Pin ③ (+)
With balanced input signal: Same phase as input source component(Can be changed with phase selector button on front panel)

Guaranteed Specifications [Guaranteed specifications are measured according to EIA standard RS-490.] ＊ indicates values measured with AD-50 installed
Frequency Response BALANCED / LINE INPUT: 3 - 200,000 Hz
20 - 20,000 Hz
AD INPUT [MM/MC]＊:20 - 20,000 Hz
Total Harmonic Distortion (for all inputs) 0.005%
Input Sensitivity,
Input Impedance

Input sensitivity
Input impedance
For rated output For 0.5 V output
40 kilohms
BALANCED
252 mV
63 mV (20 / 20 kilohms)
252 mV
63 mV 20 kilohms
LINE
AD: MM / 40 dB＊
2.5 mV
0.63 mV 47 kilohms
30 / 100 / 300 ohms
AD: MC / 66 dB＊ 0.126 mV 0.0315 mV (selectable)
Input

Rated Output Voltage, BALANCED / LINE OUTPUT:
Output Impedance RECORDER REC (with AD input) ＊:S / N Ratio(Gain selector: 18 dB)+0 ‒3.0 dB+0 ‒0.2 dB±0.3 dB

Input
BALANCEDLINE
AD: MM / 40 dB＊
AD: MC / 66 dB＊

2V
252 mV

Input shorted (A weighting)S / N ratio at rated output
110 dB
110 dB
80 dB
68 dB

Maximum Output Level (0.005% THD, 20 - 20,000 Hz)
BALANCED / LINE OUTPUT:
RECORDER REC (with AD input)＊:
Maximum
BALANCED / LINE INPUT:
Input Voltage

7.0 V
6.0 V
6.0 V

Max. AD input voltage＊ MM / 40 dB INPUT:(1 kHz, 0.005% THD) MC / 66 dB INPUT:60.0 mV
3.0 mV

50 ohms
200 ohms
S / N ratio(EIA)
108 dB108 dB
86 dB
76 dB

Minimum LoadImpedance

BALANCED / LINE OUTPUT:
600 ohms
RECORDER REC:
10 kilohms
Channel Separation –74 dB (10 kHz)BALANCED INPUT→ BALANCED OUTPUT:
18 dB
Gain
(Gain selector: 18 dB) BALANCED INPUT→ LINE OUTPUT:
18 dB•With gain selector set LINE INPUT→ BALANCED OUTPUT:
18 dB
to 12 dB, add –6 dB
LINE INPUT→ LINE OUTPUT:
18 dB
to all values at right•With gain selector set AD［MM: 40 dB］INPUT ＊ → BALANCED / LINE OUTPUT: 58 dB
to 24 dB, add 6 dB to AD［MM: 40 dB］INPUT ＊ → REC OUTPUT:
40 dB
all values at rightAD［MC: 66 dB］INPUT ＊ → BALANCED / LINE OUTPUT: 84 dB
AD［MC: 66 dB］INPUT ＊ → REC OUTPUT:
66 dB
Tone Controls

Bass / Treble controls turnover frequencies and adjustment range
BASS:
40 / 100 Hz±10 dBTREBLE:8 / 20 kHz±10 dB
Loudness Compensation +6 dB (100 Hz)
25 Hz: –12 dB / octave
Subsonic Filter ＊–20 dB
Attenuator
Output level: 2 V (40 ohms), Suitable impedance: 8 ohms or higher
Headphone JackPower Requirements 120 / 220 / 230 V AC, 50 / 60 Hz(Voltage as indicated on rear panel)Power Consumption 34 W
Maximum Dimensions Width
465 mm(18.3”)
Height
150 mm (15.9”)
Depth
405 mm (15.9”)
Mass
16.9 kg (37.0 lbs) net
23.0 kg (50.7 lbs) in shipping carton

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.

Supplied accessories● AC power cord
● Audio cable with plugs AL-10● Remote Commander RC-230●

The specifications and appearance of this product are subject to change without notice.
L1805YPRINTED IN JAPAN

850-2213-00（B1）