INTEGRATED STEREO AMPLIFIER● AAVA volume control ● Power amplification stage with bipolar transistors
in double parallel push-pull configuration ● Rated for 120 watts into 4 ohms
and 90 watts into 8 ohms ● High damping factor of 500 ● Power amplification stage configured as instrumentation amplifier ● Current feedback
amplification topology in power amplification stage ● Logic-control relays for
shortest signal paths ● Strong power supply with massive high-efficiency
transformer and large f iltering capacitors ● Protection circuitr y using
MOS-FET switches ● Two rear panel expansion slots allow use of option boards

Integrated Amplifier with Scalability that Exceeds the Imagination
The AAVA volume control builds upon the knowledge of high-end equipment to control volume
without loss of information. The power amplification section utilizes the instrumentation
amplifier principle to create an ideal speaker driver. The low impedance design of the output
circuitry brings out the full potential of every speaker. Two option boards can be added forimproved expandability. The E-280 sound performance will defy the imagination.

Innovation – At the leading edge of technology■ AAVA volume control
AAVA is a revolutionary type of volume control that completely doesaway with any variable resistors in the signal path, instead using a
combination of 16 V-I converter circuits with different gain. Unlike
conventional volume controls, the music signal is not attenuated bya rotary resistor, so that low distortion and an optimum S/N ratio can be
maintained over the entire volume range. The E-280 utilizes maximum
gain in 4 parallel rows and secondary V-I converter circuits arrangedin 2 parallel rows, which doubles the total output current capability
and halves the circuit impedance to further reduce noise.

16 types (1/2 - 1/216) ofweighted current

16 current switches
216 = 65,536 paths total

Diagram ofthe AAVA Principle

V- I Converter
4 rows122 rows

High Voltage
Current Feedback
Amplifier

1
4

I-V Converter

18Current re-converted to voltage
I-V

INPUT

Adds current

OUTPUT

5-MCS■ The noise-minimizing AAVA volume control assembly【AAVA features】●Purely analog principle avoids the inherent noise of digital circuitry●Excellent S/N ratio at any volume level position●

No change in sound quality over the entire range●

Finely graded volume adjustment steps●No volume difference between left and right channels●High channel separation●

Left/right balance adjustment and attenuation also realized with AAVA

132768165536

Turn the volume control andthe sound level position is detected
CPU turns current
switches ON or OFF
to correspond withthe position of thevolume control

Sound quality – Simply aiming for the best
■ Reinforced power amplification stage
A power amplification stage with two bipolar transistors in a double
parallel pull-push configuration for the left and right channels mounted
directly to large heat sinks. Rated output of 90 W into 8 ohms or 120 W
into 4 ohms of high power.
■ 25% improved damping factor
Balanced Remote Sensing and MOS-FET switches result in a damping
factor of 500, representing a 25% improvement over the predecessor model.
■ Power supply circuitry designed for optimum stability
The large transformer and massive 30,000 μF filtering capacitors provide
rock-stable high-quality power.

Massive transformerLarge filtering capacitors

Bipolar powertransistors

LEVEL DISPLAY

Power amplifier assembly

・VolumeCPU ・Balance・Attenuator

Advanced Functions❶❷❸❶ Preamplifier / power amplifier

separator switch❷ Speaker output selector❹❺❻❸ Recorder selector❹ DAC input selector❺ Display mode selector button❼❽❾❻ MC / MM selector button❼ Phase selector button❽ Tone control on / off button❿❾ Bass control❿ Treble control⓫ Balance control

⓫⓬

⓭

⓮

⓬ Mono / stereo selector button⓭ Loudness compensator on / off button⓮ Attenuator on / off button

Advanced features■ Logic-control signal switching relays for shortest signal paths■ Five line level inputs and one balanced input■ Line input and output connectors for a recorder■ Individual phase setting for each input■ Stereo signal can be switched to monophonic operation■ Left/right balance control also realized with AAVA
■ –20 dB attenuator■ Loudness compensator enhances low end presence■ Tone controls using summing active filters■ Power amplification stage configured as
an instrumentation amplifier■ Current feedback amplification circuit topology assuresexcellent phase characteristics in high range■ Speaker output protection circuit guards against
short-circuiting■ Protection circuitry using MOS-FET switches■ Two sets of large speaker terminals■ Preamplifier and power amplifier sections can beused separately■ Preamplifier outputs also support bi-amping connection■ Power amplifier inputs allow use of that section only
■ Dedicated headphone amplifier designed for optimum
sound quality■ Two rear panel expansion slots allow use of option boards■ DAC input selector button for use when digital input board(DAC-50 or DAC-40) is installed■ Numeric indication of digital signal sampling frequency(when DAC-50 or DAC-40 is installed)■ High-sensitivity analog peak power metersLine input and output connectors

Balanced input connectors

Two rear panel expansion slots allow use of option boards■ Supplied RemoteCommander RC-250
Allows volumeadjustment, input
source switching,etc.

Protection circuitry assembly

Speaker terminals with thick, short connecting shaftsBi-amping for further enhanced soundOption Boards

In a bi-amped setup, the speaker units for the LOW frequency
range and the HIGH frequency range are driven by separate
amplifiers with equal gain, which enables playback with even
Left speaker
Right speakerhigher sound quality.

Rear panel expansion slots allow use of
three types of option boards (DAC-50,AD-50, LINE-10). Up to two boards can beinstalled, according to the requirements.

＊The speakers must havea built-in crossover networkand separate inputs for theLOW and HIGH range.

■ The following option＋ ○− ○− ○＋○HIGH

LOW− ○＋ ○− ○＋○HIGH

LOW

AD-50

Photo shows an option board installation example.
RIGHTLEFT

Analog Disc
Input Board

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

Line Input
BoardLINE-9

Coaxial digital cable
LEFT

Optical fiber cable

RIGHT− ＋ − ＋USB cable

To INPUTPower amplifier

CD player

PC

DAC-50Power switch

Remotesensor

Level / frequency
display* Please see the previous pagefor details on these functions.

Frequency
Response

Damping Factor
Input Sensitivity,
Input ImpedanceMax.
input voltage
Output Voltage
Output ImpedanceGainLine Input Board LINE-10

High-performance DAC with twoAK4490EQ chips from Asahi Kasei
Microdevices driven in parallel.

Provides anadditional
set of unbalanced line
level inputs.

Input

Signal Sampling frequencies Number of bits
2.8 MHz
5.6 MHz11.2 MHzDSD
1-bit
USB
11.2 MHz:ASIO only
PCM 32 to 384 kHz 32-bit
OPTICAL PCM 32 to 96 kHz
24-bitCOAXIAL PCM 32 to 192 kHz 24-bit

LINE-10

Rear Panel
Option board
installation slots

Power amplifier input
Recorder input / output
connectors MAIN IN
connectors REC / PLAY
Line input connectors
Preamplifier output
TUNER / CD / LINE 1, 2, 3
connectors PRE OUT

Volume control

Headphonejack

Guaranteed Specifications
Continuous Average Output(both channels driven)
Power (20 – 20,000 Hz)
THD(both channels driven)௅+]Intermodulation Distortion

InputImpedanceMCMM66 dB
40 dB
30 ohms
100 ohms 47 kilohms
300 ohms

AD-50

Front Panel
Powermeters

Cartridge
Gain

DAC-50Digital component

From PRE OUT● Subsonic filter

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

Connection example

Inputselector● Supports MC and MM cartridges● Load impedance selector button (MC only)

Digital Input
Board

Digital Input Board− ＋ − ＋E-280DAC-50

AD-50

Features a high-performance phonoequalizer for playback of analog records.

boards can also be used:＊The example shows asetup with an additional
power amplifier for theLOW frequency range.

Analogoutputs

Analog Disc Input Board

4-ohm load
8-ohm load

120 W
90 W

4 to 16 ohm load

0.05%

Balanced input connectors
BAL CD Pin ② (‒), Pin ③ (+)* Can be changed with the phaseselector button on the front panel

AC power
supply connector

Speaker terminals A / B (2 sets)
Max.
Supported
16 mm
spade lug(0.63 )dimensions Min. 7 mm (0.28 )[Guaranteed specifications are measured according to EIA standard RS-490]

0.01%
At rated continuous
BALANCED INPUT
20 – 20,000 Hz (+0, -0.5 dB)
average output
At rated continuous
LINE INPUT
20 – 20,000 Hz (+0, -0.5 dB)
average output
At rated continuous௅+] G%
average output
MAIN INAt 1 watt output: 3 – 150,000 Hz (+0, -3.0 dB)
500 (with 8-ohm load, 50 Hz)
Input sensitivity
Input
Input
For rated output For 1 W output (EIA) Impedance
BALANCED INPUT
134 mV14.2 mV
40 kilohms
LINE INPUT
134 mV14.2 mV
20 kilohms
MAIN IN
1.07 V113 mV
20 kilohms
BALANCED INPUT
5.0 V
LINE INPUT
5.0 V
At rated continuous
PRE OUTPUT
1.07 Vaverage output
PRE OUTPUT
50 ohms
BALANCED INPUT ĺPRE OUTPUT
18 dB
LINE INPUT ĺPRE OUTPUT
18 dB
MAIN IN ĺOUTPUT
28 dB

Tone Controls

Turnover frequency and Bass: 300 Hz
adjustment range
Treble: 3 kHz

Loudness
Compensator
Attenuator+6 dB (100 Hz)-20 dB
Input shorted (A weighting)
Input

S/N Ratio±10 dB±10 dBS/N ratio at rated output

S/N ratio(EIA)

BALANCED INPUT
96 dB
97 dB
LINE INPUT
107 dB
98 dB
MAIN IN
122 dB102 dB
Logarithmic type peak level display of output in dB or percent
1 set of speakers
4 to 16 ohms
2 sets of speakers
8 to 16 ohms
Suitable impedance
8 ohms or higher

Power meters
Output LoadImpedance
Stereo Headphones
Power
120 V, 220 V, 230 V AC (voltage as indicated on rear panel), 50/60 Hz
Requirements
Idle
52 W
PowerConsumption
In accordance with IEC 60065
249 W
MaximumWidth 465 mm (18.31”) × Height 151 mm (5.94”) × Depth 420 mm (16.54”)
Dimensions
Net
20.4 kg (45.0 lbs)
Mass
In shipping carton
26 kg (57 lbs)

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
● Remote Commander RC-250●The specifications and appearance of this product are subject to change without notice.
B2100Y PRINTED IN JAPAN 850-2221-00（B1）