STEREO CONTROL CENTER● Revolutionary AAVA volume control ● Separate power transformers for left
and right channels ● Selectable preamp gain ● Independent phase selection
for each input position ● Fully modular construction with individual left/right
amplifier units on motherboard ● Logic-controlled relays for shortest signal
paths ● Tone controls designed for optimum sound quality ● Option board slots
provide versatility for handling digital input signals or analog record playback

Further improved AAVA volume control provides ultra-smooth action −Adjust the listening level without any losses in sound quality or performance. Complete dual mono construction features separate power supplies,
plus separate AAVA unit amplifier modules on a motherboard. Individualcontrol of phase for each input position. Option boards enable reproduction of digital input signals and high-grade playback of analog records.
Ever since being introduced in the model C-2800,
Accuphase’s ground-breaking AAVA (AccuphaseAnalog Vari-gain Amplifier) volume control has
undergone further refinements, reflecting accumulated
technical know-how. The result has made an excellent
idea even better, and it has helped Accuphasepreamplifiers maintain their position as undisputed
leaders and reference products both in terms of soundquality and performance.
The C-2110 is a successor to the model C-2000. It
inherits advanced design technology from the C-2810
and C-2410 and features AAVA volume control withthe same outstanding specifications and configuration
but further augmented circuitry. AAVA is a newkind of volume control that assures excellent sonicperformance by integrating the amplification andvolume control tasks and eliminating all mechanicalcontact points from the signal path. The fact thatthe music signal no longer has to pass through any
variable resistors brings a number of distinct design
advantages and enhances sonic purity. Anotherbenefit of AAVA is that only highly reliable electronic
components are used, ensuring that the outstanding
performance and sound quality of the amplifier willremain undiminished for many years to come. In actual
operation, the volume knob on the front panel which
is only used for position detection has the same feelas on a conventional amplifier.
The power supply section of the C-2110 employs
separate transformers, while filtering capacitors andother parts of the power supply are also duplicated forleft and right. What’s more, the AAVA circuitry, balanced
output circuits, and other unit amplifiers are also entirely
separate for the two channels, arranged on a highquality motherboard. This fully monaural construction
prevents unwanted crosstalk and interaction both on
the electrical and the physical plane.
Most of the internal circuitry of the C-2110 is devoted
to AAVA, but there are also tone controls, a loudness
compensator, recorder connection support and otherconvenient features. The PHASE button lets the user
specify the phase setting for each input position
separately, and EXT PRE connectors offer furtherenhanced flexibility. The overall result is a versatile
analog preamplifier of immense appeal.

Further Improved AAVA (Accuphase Analog Vari-gain Amplifier) Volume Control
AAVA is a radically different volume control principle that eliminates all variable resistors from the signal path and provides top-notch performanceand sound quality. Because the music signal is not affected by changes in impedance, high signal-to-noise ratio and low distortion are maintainedat any volume control setting.

■ Volume control resolution

16 current switches(65,536 possible combinations)

AAVA adjusts the listening volume by means of 16 weighted
V-I converter amplifiers which are controlled by currentswitches. The number of possible volume steps set by thecombination of these converter amplifiers is 2 to the powerof 16 = 65,536.

■ Input buffer amps use 5-MCS topology

One of the factors that have a bearing on possible noise in
an AAVA arrangement is the input buffer. By connecting fivehigh-performance amps in parallel, drive capability under
low-load conditions has been improved, and excellent S/Nratio is assured.

■ AAVA ensures high S/N ratio and uniform
frequency response

I-V Converter

BUFFER

Reconversion ofcurrent into voltage

INPUT
BUFFER+Input music signal

Because AAVA is an electronic circuit employing fixed-value
resistors, there is virtually no left/right tracking error also at
low volume levels. Since channels can be kept separate,crosstalk also does not present a problem.

■ Simple circuit configuration

AAVA unifies the amplifier and volume control functions,
resulting in a circuit that is electrically very simple. Long-term
reliability is excellent, with performance and sound qualitythat will remain unchanged also after prolonged use.

OUTPUT

Currentvalues areadded

Unlike conventional volume controls, AAVA does not
introduce a change in impedance at any volume setting.
Consequently, there is no deterioration of S/N ratio andfrequency response remains totally uniform. The benefits
are especially apparent at settings that correspond tonormal listening levels, because the sound remains perfectlytransparent and the tonal quality is not altered in any way.

■ No more left/right tracking differences orcrosstalk

Operation principle of AAVA in C-2110

CPUV-I Converter
Conversion into current with 16
weighting stages (1/2 - 1/216)

GAIN

VolumeBalance
Attenuator

CPU detects position of volume
knob and operates current on/off
switches according to knob position

Volume knob is turned andposition is detected

AAVA operation principle
The music signal is converted into 16 types of weighted current by V-I (voltage - current)
converting amplifiers [1/2, 1/22, ... 1/215, 1/216]. The 16 currents are turned on or off by 16 current
switches, and the combination of switch settings determines the overall volume. The switching
operation is controlled by a CPU according to the position of the volume control knob. The
combined signal current forms a variable gain circuit that adjusts the volume. Finally, the combined
current is converted back into a voltage by an I-V (current - voltage) converter.

■ AAVA means analog processing

The AAVA circuit converts the music signal from avoltage into a current, switches gain by means ofcurrent switches, and then reconverts the current
into a voltage. The entire process is carried out inthe analog domain.

■ Same operation feel as a conventional
high-quality volume control
The volume control knob position is detectedby a dedicated CPU which in turn selects thecurrent switches for AAVA operation. Operating
the knob therefore feels exactly the same as witha conventional control, and as before, operation
via the remote commander is also possible.

■ Attenuator and balance control also
implemented by AAVA
The functions of the attenuator and the left/rightbalance control are covered by the AAVA circuitas well, eliminating the need for additional circuitstages. Keeping the configuration simple helps tomaintain high performance and sonic purity.

AAVA assembly includes boards withseparate modules for left and right
input buffers, 16 V-I converters + current switches, current adding
circuitry, and I-V converters,
as well as the CPU board
for AAVA control.

■ Dual mono construction with separate left and right transformers andseparate circuit modules mounted on a board.
■ Logic-controlled relays assure high sound quality and long-term reliability.
Strategically placed relays ensure optimum signal flow and prevent degradation that couldoccur if the signal has to travel a long way for input and output connection and function
switching.

■ Individual phase control for each input position

Balanced input and output connectors

The setting of the PHASE button is memorized for each input separately, and the LED indicatorshows the respective status: lit (phase inverted) or out (normal phase).

1614■ Selectable preamp gain
■ Dedicated headphone amplifier optimized for sound quality■ EXT PRE function allows use of external preamplifier■ Versatile arrangement of balanced and unbalanced input and outputconnectors■ Two option board slots on rear panel for system expansion

12Response in dB

The overall gain of the preamplifier can be set to 12 dB, 18 dB, or 24 dB.

Unbalanced input and output connectors

1810

LOUDNESSONLOUDNESSCOMPENSATOR:COMPENSATOR:
ON

864
20-2

OFF/EXTINVOUTPUT

PHASE-4-6
10100

1k

Frequency in Hz

10k

100k

Loudness compensator
characteristics

EXT PRE function and phase selector button, with LED indicators■ More versatile features:• Provisions for recording and playback with a recorder• Loudness compensator augments bass impact
at low listening volume• Attenuator (–20 dB)
Gain selector■ Supplied remote commander
RC-200Allows volume adjustment,input source switching,and other operations.

Option Boards■ Tone controls using summing active filtersfor optimum sound quality

Digital Input Board

Three types of option boards can be used in the C-2110:
the Digital Input Board DAC-20, Analog Disc Input Board
AD-20, and Line Input Board LINE-10. These boards canbe installed in the rear-panel slots as required.

Bass turnover frequency:
40 or 100 Hz
Treble turnover frequency:
8 or 20 kHz

This board features an MDS (Multiple Delta Sigma) ++type D/A converter and allows direct digital connectionof a CD player, MD or DAT recorder or other component
with digital output (sampling frequency up to 96 kHz,24 bits) for high-quality music reproduction.

• It is possible to install two identical boards.
-A1

Input

-A2

Output• Inputs for coaxial and optical fiber connections are provided.

• The Analog Disc Input Board AD-9/AD-10 and theLine Input Board LINE-9 can also be used.
• When using the AD-9/AD-10, the MC/MM button on
the front panel of the C-2110 has no effect. MC/MMswitching must be performed on the board.

F1
VR1Analog Disc Input Board

F2• MC/MM switching is possible on the front panel of theC-2110.
• Internal DIP switches control MC input impedance andsubsonic filter on/off.

16BASS

Response in dB

AD-20

This board serves for playback of analog records. It contains a high-performance, high-gain phono equalizer.

VR2

12DAC-20

TREBLE

100Hz40Hz

8kHz
20kHz

62 dB
MC Gain:
Input impedance: 10/30/100 ohms (selectable)

836 dBMM Gain:Input impedance: 47 kilohms

40-4-8

Line Input Board-12-1610100

1kFrequency in Hz

10k

100k

AD-20

DAC-20Tone control characteristics

LINE-10

This option board provides a set of unbalanced line
level inputs.

Photo shows option board installation example.

Guaranteed Specifications■ Front panel✽ Guaranteed specifications are measured according to EIA standard RS-490.

Pressing this button
opens the sub panel.

● Frequency Response

BALANCED/UNBALANCED INPUT
3 - 200,000 Hz+0, –3.0 dB
20 - 20,000 Hz+0, –0.2 dB● Total Harmonic Distortion (for all inputs)

0.005%● Input Sensitivity, Input Impedance
Input
BALANCEDUNBALANCED

Sensitivity
For rated output
For 0.5 V output
252 mV63 mV
252 mV
63 mV● Rated Output Voltage, Output Impedance
BALANCED/UNBALANCED OUTPUT:
RECORDER REC:

Input impedance
40 kΩ
20 kΩ
2 V, 50 ohms
252 mV, 200 ohms

● S/N Ratio (gain selector: 18 dB)
Input
BALANCEDUNBALANCED■ Rear panel

Input shorted, IHF-A weighting
S/N ratio at rated output
109 dB
109 dB● Maximum Output Level (0.002% THD, 20 - 20,000 Hz)
BALANCED/UNBALANCED OUTPUT:
RECORDER REC:

Option board
installation slots

S/N ratio (EIA)
107 dB
107 dB
7.0 V
6.0 V● LINE Maximum Input Level

BALANCED/UNBALANCED INPUT:

6.0 V● Minimum Load Impedance

BALANCED/UNBALANCED OUTPUT:
RECORDER REC:

600 ohms
10 kilohms● Crosstalk–74 dB or better (10 kHz)● Residual Noise

0.8 μV or less (A weighting)● Gain (gain selector: 18 dB)✽ Gain switchable to 12/18/24 dB
BALANCED/UNBALANCED INPUT → BALANCED/UNBALANCED OUTPUT:
BALANCED/UNBALANCED INPUT → REC OUTPUT:

A Input selector
B Function LED indicators
C Volume control
D Power switch
E Output selector
F BASS/TREBLE controls
G Function selector buttons
Phase, stereo/mono, MM/MC, tone control on/off,
40/100 Hz turnover, 8/20 kHz turnover
H Recorder selector
OFFON PLAY
I Gain selector
12dB 18dB 24dB
J Balance control
K Loudness compensator button

L Attenuator
M Headphone jack
N Line inputs
TUNER CD LINE1, 2, 3
O Recorder outputs/inputs
P Unbalanced output connectors (2 sets)
Q External preamplifier inputs(unbalanced)
R CD/LINE balanced inputs
a Groundb Inverted (–)
c Non-inverted (+)
S Balanced outputs
T External preamplifier inputs (balanced)
U
21 AC power connector

18 dB
0 dB

● Tone Controls

Bass/Treble controls with selectable turnover frequencies
BASS:40/100 Hz ±8 dB
TREBLE: 8/20 kHz±8 dB● Loudness Compensation+6 dB (100 Hz)● Attenuator–20 dB● Headphone Jack

Suitable impedance: 8-100 ohms

● Power Requirements

AC120 V/230 V, 50/60 Hz(Voltage as indicated on rear panel)● Power Consumption

32 watts● Maximum Dimensions

Width 465 mm (18-5/16”)
Height 150 mm (5-7/8”)
Depth 405 mm (15-15/16”)● Mass

16.8 kg (37.0 lbs) net
22.0 kg (48.5 lbs) in shipping carton● Supplied Remote Commander RC-200
Remote control principle: Infrared pulse
Power supply:
3 V DC (IEC R03 batteries × 2)
Maximum dimensions:
56 × 175 × 26 mm
Weight:153 g (including batteries)

Remarks
This product is available in versions for 120/230 V AC. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.
The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.

■ Supplied Accessories● AC power cord
● Audio cable with plugs (1 m)● Remote commander RC-200●Specifications and design subject to change without notice for improvements.

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