● Revolutionary AAVA volume control ● Output stage with high power transistors in parallel push-pull
configuration produces quality power: 100 watts x 2 into 8 ohms ● Instrumentation amplifier principle
for power amplifier input stage allows fully balanced signal transmission, complemented by current
feedback amplification circuitry ● Logic-control relays for shortest signal paths ● Strong power
supply with massive high-efficiency transformer and large filtering capacitors ● POWER IN button
allows separate use of preamplifier and power amplifier sections ● Numeric indication of volume level

Prepare to Be Surprised The E-370 takes the performance and sound quality of the integrated
amplifier to another level. Featuring a wealth of technological advances, such as the renowned
AAVA volume control with even lower noise level and a power amplifier section with super low
impedance, it delivers S/N ratio and drive power that stand out from the crowd. With soundquality to rival much higher ranked products, it opens up a world of unlimited musical enjoyment.
Inheriting outstanding technology from thetop-of-the-line E-600 and the high-power version
E-470, the E-370 represents a full model change
from the E-360. It is an integrated amplifier that
redefines what this product category can do, both interms of technical excellence and sonic performance.
Internally, the preamplifier and power amplifier
sections are kept entirely separate, in order to allow
each to develop their full potential, rivaling thefunctional concept and quality of separate typecomponents. With a simple flick of a switch, thePOWER IN feature allows individual use of the two
sections.
At the heart of the preamplifier section is the sameversion of the AAVA volume control as found in theE-600, pushing the noise floor to an absoluteminimum. The power amplifier block employs thelatest instrumentation amplifier topology, enabling
fully balanced signal transmission in all stages. Thisreliably shuts out external noise interference andensures perfectly stable operation. As a result,overall S/N ratio has been improved by 3 dB. Other
impressive features include MOS-FET switches inplace of relays for speaker protection, helping toensure superb electrical characteristics and improve
long-term reliability. The circuit topology of the output
stage is designed for extremely low impedance,
resulting in a damping factor of over 400, demonstrating excellent speaker drive capability.
Bipolar transistors arranged in a parallel push-pull
configuration for each channel further enhance
performance with low-impedance loads, producing
an impressive 150 watts into 4 ohms.

Preamplifier Section Functions and Features

AAVA (Accuphase Analog Vari-gain Amplifier) Volume Control
AAVA volume control with further lowered noise floor

The volume control is the most important aspect of a preamplifier, with a decisive influence of performanceand sound quality. AAVA is a revolutionary type of completely analog volume control that does away withany variable resistors in the signal path. This ensures that the signal remains completely unaltered, freefrom the adverse effects of impedance changes. As a result, both S/N ratio and sound quality are excellent
at any volume setting.
■ No more left/right tracking differences or crosstalk.
■ Attenuator and balance control also implemented by AAVA, eliminating additional circuitry.
■ Operation feel is exactly the same as a conventional volume control, and remote control is alsopossible.
■ Combination of 16 typesof weighted V-I converter
amplifiers gives 65,536
possible volume steps.
■ Volume level can bedisplayed accurately asa numeric indication.
■ AAVA volume control assembly with increased circuit and parts mounting density★ 2 parallel circuits★
12Upper two V-I
amps paralleled
for improved S/Nratio

122

Input music signal

16 current switches(65,536 possible combinations)

AAVA configuration in E-370★

I-V Converter
Reconversion ofcurrent into voltage

123＋ Current

BUFFERINPUT5-MCS

Input buffer
amps driven in
powerful 5-MCSconfiguration

Hermetically sealed relays designed for industrial
communication applications are used in an
optimized logically controlled configuration torealize a wide array of input choices, includingbalanced connections that are impervious toexternally induced noise.

I-V
OUTPUTvalues areadded

LEVEL DISPLAY

1215

1216

V- I Converter

CPUConversion into current
with 16 weighting stages(1/2 - 1/216)

VolumeBalance
Attenuator

Volume knob is turnedand position is detected

CPU detects position of volumeknob and operates current on/offswitches according to knob position

Power Amplifier Section Functions and Features
Strong power supply with oversized high-efficiency
transformer and large filtering capacitors (30,000 µFx 2) providing 1.5 times more smoothing capacity.

Parallel push-pull power amplifier unit withhigh-power transistors produces ample power:
150 watts per channel into 4 ohms or 100 watts
per channel into 8 ohms.

Line and balanced input/output connectors

PHASE
selector button

Two option board installation slots on the rear
panel provide further versatility.
The DAC input selector button allows the user toselect the desired input when using the Digital
Input Board
DAC-40 WithUSB Port.
Display ofDAC input selector button and LED indicators
the sampling
frequency of the locked
digital signal is also
possible.
Sampling frequency display example

When the Analog Disc Input Board
AD-30 is installed, MC/MM switching ispossible with a selector on the front
panel of the E-370.

MC/MM
selector button

A dedicated headphone amplifier optimized forsound quality is built in. Setting the speaker
output to OFF allows musical enjoyment via
headphones only.

Massive power transformerPOWER IN button andseparate preamplifier
outputs/power amplifier
inputs give independent
access to preamplifierand power amplifier
sections. This makes it
easy for example to try
another preamplifier or
add a second power
amplifier for bi-amping.

Filtering capacitors

High-performance high-power transistors
designed for audio applications

Output power characteristics
200

POWER IN
selector button

192W

175
150

Preamplifier outputs (left)
Power amplifier inputs (right)

Semiconductor (MOS-FET) switches used for speaker protection circuitry prevent contact problems andensure long-term reliability. Eliminating
mechanical contacts
from the music signal path also furtherenhances sound quality.
MOS-FET switches

Output power (W)Individual phase setting ispossible for each input position.
The balanced connectors
support both pin 2 and pin
3 configurations.

125

121W

150W

100
75

100W

50
25Max. output power
Rated output power8Ω
4Ω
Impedance (Ohms)

Two sets of large speaker terminals (A / B) also
accept spade and banana connectors and facilitate bi-wiring connection of loudspeakers.
Metal bus bars
directly link thespeaker terminals
with the output
circuitry, for minimum losses andmaximized perforTwo sets of large speaker terminals
mance.

Power amplifier assembly

Redesigned NFB circuit topology minimizes output impedance and improves
the damping factor,
thereby contributing
to enhanced soundquality.

Balanced remote sensing technology provides
feedback for both the signal and GND lines fromnear the speaker terminals to ensure lowest
impedance and improved damping factor.

++ INPUT

Signal sensing–NFB
NETWORK+NFB
NETWORK– INPUTThe analog peak
power meters feature a new type ofLED lighting for improved readability.
The meters provide
visual enjoyment as well as precise information
about constantly fluctuating output levels.

＋ Signal

POWERAMP.

–NFBNETWORK

Speaker terminals–－ GND+

Protection circuit assembly

Ground sensing

Balanced remote sensing

Parallel push-pull output stage and power amplifier stage
mounted on large heat sink. Two identical units are arrangedon the left and right sides of the chassis.

The use of High Carbon cast iron insulator feetfurther enhances sound quality.

Circuit diagram of E-370 power amplifier section (one channel)+ B3+ B2BIAS
STABILIZER

Q5Q 13

Q9＋Q7－Q1

Q 15

Q 11Q3NFB
NETWORKINPUTOUTPUTNFBNETWORKBIASSTABILIZERNFBNETWORKQ2－

Q4
Q6＋Q 12Q 10BIASSTABILIZER– B3■ Supplied remotecommander RC-230
Allows volume
adjustment andinput source
switching.

+ B1

Q8

Q 14

Q 16– B1– B2Connection Example For Bi-amping Setup
In a bi-amped setup, the speaker units for the LOW frequency
range and HIGH frequency range are driven by separateamplifiers of equal gain, for even better sound quality.
＊The speakers must have abuilt-in crossover networkand separate inputs for
LOW and HIGH range.
＊The example shows asetup with an additional
amplifier for the high frequency range.

Left loudspeaker Right loudspeaker＋ ○－ ○－ ○＋
○
LOW
HIGH

RIGHT

E-370

－ ○＋ ○－ ○＋○
LOW
HIGH

Option Boards

Digital Input Board● Twoslots allowing easy
insertion of option boards
are provided on the rearpanel.
● Option boards can be used
to implement high-quality
reproduction of a digitalmusic signal supplied directly to the amplifier, or
high-quality reproductionof analog records.
● It is also possible to install
two identical boards.

● COAXIAL: For 75-ohm coaxial cable

Supported sampling frequency
range: 32 kHz to 192 kHz, 24 bit● OPTICAL: For optical fiber cable● USB:AD-30
Photo shows an example for
option board installation.

Analog Disc Input Board

Coaxial digital cable(Up to 192 kHz/24 bit)● MC/MM switching is possible on the front panel

Digital componentof the E-370.

● Internal DIP switches control MC input impedance

Digital (S/PDIF) output

DAC-40Power amplifier (P-4200, A-36 or similar)

Front Panel❶ Input selector

MM Gain:

66 dB
Input impedance: 30/100/300 Ω (selectable)

Sub panel（40 dB
Input impedance: 47 kΩ

ComputerLine Input Board＊For playback of material on a computer via the USB port, itis necessary to install software from the supplied USB Utility
CD-ROM. (Not required with an Apple Macintosh computer.)❹ Volume control❺ Power switch

Speakers ON/OFF A/Bcontrol
MONO/STEREO switching
POWER IN switching
Phase switching
Tone controls ON/OFF

USB cable

Type B connector
Up to 192 kHz/24 bit❸ Function LED indicators❷ Volume level display❼ Bass control❽ Treble control❻ Function selector buttons ❾ Left/right balance

MC Gain:（To INPUT
CD player(Up to 96 kHz/24 bit)

RIGHT

－ ＋ － ＋Analog
outputand subsonic filter on/off.

Optical fiber cable
LEFT

AD-30

Features a high-performance, high-gain phonoequalizer for playback of analog records withoutstanding sound quality.

DAC-40 connection example

From PRE OUT

Supported sampling frequency
range: 32 kHz to 96 kHz, 24 bit
For USB cable (Type B connector)
Supported sampling frequency
range: 32 kHz to 192 kHz, 24 bit

DAC-40

LEFT－ ＋ － ＋DAC-40

Features a high sound quality, high-performance
MDS++ D/A converter. The USB port allows
connection to a computer via USB cable, forreproduction of high-resolution music librarydata with superior sound quality.

LINE-10

Provides a set of general line level inputs.

Rear PanelLine inputs
TUNER / CD / LINE 1, 2, 3

Recorder input/
output connectors

Option Board
installation slots

Preamplifier output connectors (Line)Power amplifier
input connectors (Line)
Left/right speaker
output terminals (A/B, 2 sets)

Headphone
jackAttenuator
Loudness
compensatorAC power connector★
CD/LINE balanced input connectors
Pin ② – , Pin ③ ＋＊Can be changed with phaseselector button ❻Pressing this button
Function selector buttons
opens the sub panel.
Recorder ON/PLAY selection
DAC input switching, Meter ON/OFF
Display mode switching, MC/MM switching

E-370 Guaranteed Specifications [Guaranteed specifications are measured according to EIA standard RS-490.]● Rated Continuous Average Output Power (both channels operating simultaneously, 20 - 20,000 Hz)
150 W/ch4-ohm load100 W/ch8-ohm load
● Total Harmonic Distortion (both channels operating simultaneously, 20 - 20,000 Hz)
0.05%
4 to 16 ohm load
● Intermodulation Distortion 0.01%● Frequency Characteristics HIGH LEVEL INPUTAt rated continuous average output:
20 - 20,000 Hz +0, – 0.5 dB
POWER INPUTAt rated continuous average output:
20 - 20,000 Hz +0, – 0.2 dB
At 1 watt output: 3 - 150,000 Hz +0, –3.0 dB● Damping Factor
400 (with 8-ohm load, 50 Hz)● Input Sensitivity, Input Impedance

Input

Input sensitivityInput

For rated output For 1 W output (EIA) impedance

14.2 mV20 kΩ
HIGH LEVEL INPUT 142 mV
14.2 mV40 kΩ
BALANCED INPUT 142 mV
1.13 V113 mV
20 kΩ
POWER IN
● Output Voltage, Output Impedance
PRE OUTPUT 1.13 V 50 ohms
(at rated continuous average output)● GainHIGH LEVEL INPUT → PRE OUTPUT: 18 dB
POWER IN
→ OUTPUT:
28 dB● Tone Controls

Turnover frequency and adjustment range
BASS:
300 Hz ±10 dB (50 Hz)
TREBLE:
3 kHz ±10 dB (20 kHz)● Loudness Compensation +6 dB (100 Hz)–20 dB● Attenuator● S/N Ratio, Input-converted Noise

Input shorted (A weighting) S/N ratio(EIA)
S/N ratio at rated output
HIGH LEVEL INPUT
107 dB98 dB
BALANCED INPUT
97 dB
97 dB
POWER IN
123 dB102 dBInput● Power Meters● Load Impedance

Logarithmic peak level indication, shown in dB and %4 - 16 ohms (Terminals A or B)
8 - 16 ohms (Terminals A and B simultaneously)● Stereo Headphones
Suitable impedance: 8 ohms or higher● Power Requirements 120 V/230 V AC, 50/60 Hz(Voltage as indicated on rear panel)● Power Consumption
46 watts idle
245 watts in accordance with IEC 60065● Maximum Dimensions Width
465 mm (18-5/16")
Height
171 mm ( 6-6/8")
Depth
422 mm (16-5/8")● Mass22.7 kg (50.1 lbs) net
29.0 kg (63.1 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 AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.

Supplied accessories● AC power cord
● Remote Commander RC-230●The specifications and appearance of this product are subject to change without notice.

5年間保証

K1505Y PRINTED IN JAPAN 850-2194-00（B1）