m Revolutionary AAVA-II volume control m Parallel push-pull output
stage with high-power transistors delivers plenty of quality powerm Instrumentation amplifier principle in power amplifier section allows
fully balanced signal transmission m Current feedback topology
m Logic-control relays for straight and short signal paths m Robust
power supply with large transformer and high filtering capacity

Integrated amplifier with innovative AAVA-II volume control — Instrumentation amplifier configuration in power amplifier section allows balanced signaltransmission. Current feedback design ensures optimal high-range characteristics. High-power transistors in parallel push-pull arrangement are supported
by ample power supply with massive transformer and large filtering capacitors.
The result is an abundance of quality power: 100 watts per channel into 8 ohms.
The acclaimed E-300 series has a strong following
among discerning music lovers and plays a central
role in the Accuphase integrated amplifier lineup.
Technological excellence is a common theme, andknow-how is inherited and further enhanced throughout
the series. The E-350 represents a full model change
from the model E-308. Featuring the revolutionaryAAVA-II (Accuphase Analog Vari-gain Amplifier) volumecontrol, the E-350 combines latest technologicalsophistication with high-grade parts and materials,
resulting in an integrated amplifier capable of bringing
out the finest nuances in any music source.

The AAVA principle was introduced to high acclaimin the model E-550, adding another highlight tothe roster of Accuphase audio innovations. The
E-350 now features a further refined version of thisrevolutionary circuit. While AAVA in its initial form
required a considerable amount of physical space,AAVA-II delivers the same peerless performance ina more compact form factor. This was made possible
by implementing highly sophisticated surface mounttechnology while increasing component density andintegration as well as optimizing the layout.
The power amplifier section is configured as anadvanced instrumentation amplifier, which enables
fully balanced signal transmission throughout. In
conjunction with the current feedback principle, thismakes for even better electrical characteristics. The
output stage uses high-power transistors designed
for audio applications arranged in a parallel push-pullconfiguration, greatly improving the capability of theamplifier to drive low impedance loads. Speaker
operation is sustained by a large power transformer
and amply dimensioned filtering capacitors, allowing
the amplifier to deliver plenty of quality power: 2 × 140
watts into 4 ohms or 2 × 100 watts into 8 ohms.

AAVA-II (Accuphase Analog Vari-gain Amplifier) type volume control
AAVA-II (Accuphase Analog Vari-gain Amplifier) is a novel volume control concept that completely does away with variable resistors in the signal path. Because
the music signal does not have to pass through such devices, there is no adverse influence from changes in impedance. This means that the outstanding S/Nratio and low distortion of the amplifier are not compromised in any way, and the same superb sound quality will be obtained at any volume setting.

n AAVA-II input stage employs current

feedback principle that ensures high-speed,
low-noise operation and assures excellent
characteristics at high output voltages.
n Volume control resolution
The listening volume is adjusted by a combination of
16 V-I converters. The number of possible volumesteps is 2 to the power of 16 = 65,536, as determinedby current switches.

n AAVA-II circuitry is deceptively simple

Because AAVA-II employs circuitry that is electricallyvery simple, long-term reliability is excellent, withperformance and sound quality that will remainunchanged also after prolonged use.

n AAVA-II means analog processing

The AAVA-II circuit converts the music signal froma voltage into a current, to allow control by current
switches, and then back into a voltage. The entire
process is carried out in the analog domain.

n No more left/right tracking differences orcrosstalkBecause AAVA-II is an electronic circuit employing
only fixed-value resistors, there is virtually no left/righttracking error also at low volume levels, and crosstalkalso does not present a problem.

n AAVA-II maintains high S/N ratio anduniform frequency response

Because AAVA-II does not introduce any change inimpedance, there is no deterioration of S/N ratio or
alteration of frequency response. Changing the volumewith AAVA does not mean introducing noise or otherwise
degrading the sound quality of the amplifier.

n Control knob gives same operation feel aswith a conventional high-quality volumecontrol.
n Attenuator and balance control also
implemented by AAVA-II

AAVA-II operation principle
16 current switches(65,536 possible combinations)

How AAVA-II works

I-V Converter
Current feedback
amplifier
INPUT

Reconversion of current
into voltage+

OUTPUT

AMP.

–Current
values areaddedFeedback
network

CPU

Volume knob isturned and position
is detected

VolumeBalance
Attenuator

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

n CPU assembly for control of AAVA-II
and various functions

CPU detects position of volume
knob and operates current
on/off switches according toknob positionn AAVA-II volume control assemblywith higher integration density ofcomponents and circuitry

AAVA-II operates by feeding the music signal
to a V-I (voltage - current) converting amplifier
where it is weighted in 16 steps [1/2, 1/4, ...,1/32,768, 1/65,536]. The 16 current steps areturned on or off by 16 current switches, andthe combination of switch settings determines
the overall volume. The switching operationis controlled by a CPU according to theposition 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 intoa music signal voltage by an I-V (currentvoltage) converter.

n Supplied remotecommander RC-200
Allows volume adjustment and input sourceswitching.

n Output stage is configured

with high-power transistors
in parallel push-pull configuration, delivering high-quality
power: 140 W/4 ohms or 100
W/8 ohms per channel.
High-power transistorsn Instrumentation amplifier principle in power amplifier section works

in tandem with current feedback design, for outstanding high-range
phase characteristics.

n Logic-controlled relays for signal

switching ensure high sound quality and long-term reliability.

n Balanced input connectors shutn Power amplifier

out external noise interference.

assembly withparallel push-pull
devices mounted
to large heat sink andcurrent feedback circuitryn “High Carbon” cast iron insulator
feet further enhance sonic purity.

Input/output connectors directly linked to relays

n Power supply features mas-sive high-efficiency 550 VA
transformer and two large
filtering capacitors (22,000 µF× 2)

n Analog peak power meters.
n Option board installation

Biasstabilizer

slots.

NFB
network

Large power transformer

Filtering capacitorsn Two sets of large-size speaker terminals suitable for Y lugs.

INPUT
NFB
networkBiasstabilizer

NFB
network

OUTPUTn E-350 front panel switchingenables MC/MM selection for
optional Analog Disc Input
Board AD-20.

n EXT PRE button and preamBias
stabilizer

Circuit diagram of E-350 power amplifier (one channel)

plifier output/power amplifier input connectors allow
independent use of preamplifier and power amplifier
sections.

“MC/MM” button“EXT PRE” button

Large-size speaker terminals

Option Boardsn Tone controls using summing active
filters for optimum sound quality

–A1

Input

–A2

OutputDigital Input Board

Three types of option boards can be used in the E-350:
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.
m It is possible to install two identical boards.

F1m Inputs for coaxial and optical fiber connections are provided.

m The Analog Disc Input Board AD-9/AD-10 and the Line Input
Board LINE-9 can also be used.

VR1m When using the AD-9/AD-10, the MC/MM button of the E-350
has no effect. MC/MM switching must be performed on theboard.

F2
VR2Analog Disc Input Board

AD-20

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

Tone control circuit principlen Loudness compensator for enhanced
bass at low listening levelsm MC/MM switching is possible on the front panel of theE-350.
m Internal DIP switches control MC input impedance andsubsonic filter on/off.

1816Gain: 62 dBGain: 36 dB

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

1412DAC-20

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

LOUDNESS COMPENSATOR: ON10Response in dB

8MM Input impedance : 47 kilohms

6420

Line Input Board–2–4
10100

1k
Frequency in Hz

10kLINE-10

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

–6100kCompensator characteristics

Photo shows an example
for option board installation.

n Front Panel

Guaranteed Specifications[Guaranteed specifications are measured according to EIA standard RS-490.]m Continuous Average Output Power (both channels driven, 20–20,000 Hz)
140 watts per channel into 4 ohms
1120 watts per channel into 6 ohms
1100 watts per channel into 8 ohmsm Total Harmonic Distortion (both channels driven, 20–20,000 Hz)
0.03%
with 4 to 16-ohm loadm Intermodulation Distortion

0.01%

m Frequency Response
20 – 20,000 Hz
3 – 150,000 Hz

HIGH LEVEL INPUT/POWER IN+0, –0.2 dB (for rated continuous average output)+0, –3.0 dB (for 1 watt output)m Damping Factor

120 (with 8-ohm load, 50 Hz)

m Input Sensitivity, Input ImpedanceSensitivity
Input
For rated output For 1 W output (EIA) impedance
142 mV14.2 mV20 kΩ
142 mV14.2 mV40 kΩ
1.13 V113 mV
20 kΩ

Input

Pressing this button
opens the sub panel.

n Rear Panel
Option board
installation
slots

HIGH LEVEL INPUTBALANCED INPUTPOWER IN

m Output Voltage, Output Impedance
PRE OUTPUT:
1.13 V, 50 ohms
(at rated continuous average output)
m GainHIGH LEVEL INPUT → PRE OUTPUT:→ OUTPUT:POWER INm Tone Controls

18 dB
28 dB

Turnover frequency and adjustment range
BASS:
300 Hz±10 dB (50 Hz)
TREBLE: 3 kHz±10 dB (20 kHz)m Loudness Compensation+6 dB (100 Hz)

m Attenuator–20 dBm Signal-to-Noise Ratio (input-converted noise)
Input shorted (A weighting)
S/N ratio at rated output
106 dB
91 dB
121 dB

Input
HIGH LEVEL INPUTBALANCED INPUTPOWER IN

Input selector
LINE 2 LINE 1 LINE-BAL CD-BAL CD
TUNER OPTION 1 OPTION 2
Left/right channel output meters
Function indicator LEDs
Volume control
Power switch
Speaker selector OFF A
B
A+B
Copy selector
1→2OFF
2→1
Recording output selector REC OFF, SOURCE 1, 2
Function buttons
MC/MM, EXT PRE, MONO/STEREO, Meter ON/OFF
Compensator ON/OFF, Tone Control ON/OFFBass controlTreble control
Balance control
Attenuator button
Headphone jackLine inputs (unbalanced)
Recorder inputs and outputs
Preamplifier outputs
Power amplifier inputs
Left/right speaker output terminals A/B
CD/LINE inputs (balanced)
AC power connector

EIA S/N
92 dB
92 dB
98 dB

m Power Level Meters

Logarithmic compression, peak reading meters
Output dB/% scale

m Load Impedance

4–16 ohms

m Stereo Headphones

Suitable impedance:m Power Requirements

AC 120 V/230 V 50/60 Hz(Voltage as indicated on rear panel)m Power Consumption

49 watts idle
280 watts in accordance with IEC 60065

m Maximum Dimensions

WidthHeightDepthm Mass

21.7 kg (47.6 lbs) net
26.0 kg (57.3 lbs) in shipping carton

465 mm
171 mm
422 mm8–100 ohms

(18-5/16”)(6-3/4”)(16-5/8”)

m Supplied Remote Commander RC-200
Remote control principle: Infrared pulse
Power supply:
3 V DC (IEC R03 batteries × 2)
Maximum dimensions:
56 mm × 175 mm × 26 mm
Mass:
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.

n Supplied accessories:m AC power cordm Remote Commander RC-200m

Specifications and design subject to change without notice for improvements.

http://www.accuphase.com

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