● First integrated amplifier featuring Balanced AAVA volume control ● Pure Class A operation(30 watts into 8 ohms) ● Guaranteed linear power: 120 watts into 2 ohms, 60 watts into 4 ohms,
30 watts into 8 ohms ● Output stage with power MOS-FETs in triple parallel push-pull configuration ● Instrumentation amplifier principle in power amplifier for fully balanced signal transmission,
complemented by MCS+ topology and current feedback amplification circuitry ● Strong power
supply with massive high-efficiency transformer and large filtering capacitors ● Preamplifier andpower amplifier sections can be used separately ● Numeric indication of volume level

The Reference Model of a New Integrated Amplifier Generation
Aiming for Ultimate Sound With Exquisite Sensibility and a Rich Array of Further
Refined Technology

Innovative engineering and top-grade parts and materials come together in this product featuring thesuperb Balanced AAVA type volume control and a triple parallel arrangement of power MOS-FETs in
the output stage. The power amplifier section employs the latest instrumentation amplifier configuration
for balanced signal transmission, resulting in an integrated amplifier with fully balanced configurationfrom the inputs right through to the output. The massive power supply and low-impedance output
circuitry deliver 150 watts per channel (into 1 ohm, with music signal) and a damping factor of 800.

■ Balanced AAVA volume control
As a first in an integrated amplifier, the E-650 features the sophisticated Balanced AAVA type volume control incorporated in Accuphase's
top-of-the-line preamplifier model C-3850. Balanced AAVA uses twoAAVA circuits driven in a fully balanced configuration. This completelycancels out any external noise and results in unsurpassed S/N ratio.

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

V- I Converter

16 current switches
216=65,536
possible combinations

E-650
How Balanced AAVA works

12

122

I-V Converter

123＋

Reconversion of current
into voltage
I-V

Current values
are added

1215

High Voltage
Current Feedback
Amplifier■ Balanced AAVA volume control assembly■ High-accuracy, high-rigidity volume sensor construction withmassive yet responsive feel
AAVA uses a volume control knob that looks similar to conventional controls. However, Accuphase also paid careful attention to volume sensor construction. The
rotary mechanism is assembled with high accuracy and mounted to a highly rigid
frame extruded from a single aluminum block. The solid brass shaft has a diameterof 8 mm and gives a pleasingly massive yet responsive operation feel to the volume
knob. Floating suspension technology developed by Accuphase for its SA-CD/CD
players is used tomount the volume
sensor mechanism
to the main chassis.
Furthermore, utterlysmooth and quiet
operation is assured
also when adjusting
the volume with theremote commander,
thanks to insulatorsthat dampen any
vibrations of the drivemotor.

1216

LEVEL DISPLAY＋INPUT

Balanced
Input－INPUT＋OUTPUT

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

VOLUME

Volume knob is turned andposition is detected

V- I Converter
12

1
22

BALANCE ATTENUATOR

123

Current values
are added＋I-V Converter

1216

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

16 current switches
216=65,536
possible combinations

Power MOS-FETs

Output power characteristics
225
200190W

Output power (W)175

Toroidal power transformer

150

125W

150W 125120W

75W

10075
5060W
25Max. outputpower
Rated outputpower

Filtering capacitors

30W8Ω4Ω
2Ω
1Ω
Impedance (Ohms)

I-V

Reconversion of current
into voltage

1215■ Triple parallel push-pull output stage with power MOS-FETs andpower amplifier stage mounted on a large heat sink. Two identical units are arranged on the left and right sides of the chassis.
■ Class A operation (30 watts into 8 ohms). Guaranteed linearpower of 120 watts into 2 ohms, 60 watts into 4 ohms, 30 watts
into 8 ohms per channel.
■ Strong power supply with massive high-efficiency toroidaltransformer and large filtering capacitors.
The E-650 uses a massive power transformer with high output
capability. Highly effective filtering is realized with two custom-madealuminum electrolytic capacitors, each with a large 50,000 µF rating.

220W

Balanced
OutputCPU

Power amplifier assembly－ OUTPUT

■ Supplied RemoteCommander RC-220
Allows volumeadjustment andinput sourceswitching.

Line and balanced input/output connectors

MOS-FET switches

12367［Sub panel］
1 Speaker output selector
2 Button for activating bass/treble tone controls
3 Phase selector button for output signal
4 Mono/stereo selector button
5 Loudness compensator button for enhanced volume
impression of bass sounds
6 DAC input selector button for use when DAC-50 orDAC-40 is installed

Protection circuitry45

8 Display mode selector button for switching between
volume level and sampling frequency indication
9 MAIN IN selector for separate use of preamplifier andpower amplifier sections
Recorder selector for recording or playback

12LOUDNESS COMPENSATOR：ONCutLow frequency
range

40−4−8−1210k

100kLoudness compensator characteristics

High frequency
range

8Boost

1kFrequency in Hz

97 MC/MM selector button for selecting phono cartridge
type when AD-50 or AD-30 is installed

16100

Ultra-heavy-gauge
edgewise coil

8Response in dB

181614121086420−2−4−610

Response in dB■ Power amplifier stage features instrumentation amplifier configuration for balanced signal transmission.
MCS+ topology and current feedback principle in amplification circuitry assure excellent phase characteristics in high range.
■ Semiconductor (MOS-FET) switches used for protection circuitry prevent contact problems and ensure
long-term reliability. Eliminating mechanical contacts
from the path of the music signal also further enhancessound quality.
■ Logic-controlled relays for signal switching assurehigh sound quality and long-term reliability.
■ MAIN IN switch and preamplifier output and power amplifier input connectors allow independent use of bothsections. Both line level and balanced connectors areprovided.
■ Tone controls with balanced circuit configuration andsumming active filters for optimum sound quality.
■ Versatile array of inputs with two balanced inputs toshut out external noise interference.
■ Individual phase setting supported for each input position.
■ Dedicated headphone amplifier constructed with discrete components.
■ Two option board installation slots on the rear panel
provide further versatility. With the AD-50, AD-30, or
AD-20 board, MC/MM switching is performed on thefront panel.
■ The DAC input selector button allows the user to selectthe desired input when using the Digital Input Board
DAC-50 or DAC-40 With USB Port. Display of the sampling frequency of the locked digital signal is also possible. (This is not supported with the DAC-30, DAC-20,or DAC-10.)■ LED-based bar graphpower meters with improved sensitivity andreadability.
■ Two sets of large speaker terminals that also accept
spade connectors or banana plugs.

−1610BASS
Adjustment range

TREBLE
Adjustment range

10010k1kFrequency in Hz

Tone control characteristics

100k

Bi-amping for further enhanced soundIn 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, whichenables playback with even higher sound quality.
Left speaker

Right speaker⊖ ⊕⊖ ⊕⊖ ⊕⊖ ⊕HIGHHIGH＊ The speakers must have abuilt-in crossover networkand separate inputs for theLOW and HIGH range.
＊ The example shows asetup with an additional
power amplifier for the low
frequency range.

RIGHT

E-650

－ ＋LOW

The E-650 has two option board installation
slots on the rear panel.
These are designed foruse with three typesof options boards, depending on requirements: DAC-50, AD-50,and LINE-10.
● The following option
boards can also be
used: DAC-40, DAC-30,
DAC-20, DAC-10, AD- 30,
AD-20, AD-10, AD-9,
LINE-9.

LOW

Digital Input Board● The front panel display of the E-650 can be used to show theUSB/OPTICAL/COAXIAL selection and the sampling frequency.
● USB:USB 2.0 cable with Type B connector (max. 2 m)
USB 2.0 High Speed (480 Mbps) compliant

DAC-50AD-50

Photo shows an option board installation example.

Line Input Board

LEFT

LINE-10

Sampling frequency 2.8224 MHz, 5.6448 MHz, 11.2896 MHz/1-bit (11.2896 MHz: ASIO only) 32 kHz to 384 kHz,32-bit● OPTICAL: Optical fiber, JEITA CP-1212 compliant
Sampling frequency 32 kHz to 96 kHz, 24-bit● COAXIAL: 75-ohm coaxial cable, IEC 60958/AES-3 compliant
Sampling frequency 32 kHz to 192 kHz, 24-bit

Provides an additional set of unbalanced line level inputs.

－ ＋DAC-50
connection example

AD-50

Analog Disc Input Board

Features a high-performance phono equalizer for playback of analog records.

Coaxial digital cable● MC/MM switching can be performed on the front panel ofthe E-650.

LEFTRIGHT

MC: For MC type cartridges with low output voltage
Gain:
66 dB
Input impedance: 30/100/300 ohms (selectable)－ ＋ － ＋
to INPUT

CD player

Power amplifier(A-47 or similar)

AD-50

MM: For MM type cartridges with high output voltage
Gain:
40 dB
Input impedance: 47 kilohms

Front Panel
Input selector

Level/frequency
display
Bar graph meters

Digitalcomponent

Digital (S/PDIF) output● On-board switches for input impedance switching andsubsonic filter

From PRE OUT

Analogoutputs

DAC-50

Provides inputs for reproducing digital music signals
from digital components.

Optical fiber cable
USB cable＊ For playback of material on a computer
via the USB port, it is necessary to
install software from the supplied USB
DAC-50Utility 2 CD-ROM. (Not required with an
Apple Macintosh computer.)Computer

Rear Panel
Function display
Volume control

Recorder input/output connectors
Line inputs
TUNER / CD / LINE 1, 2, 3
Option board

installation slots

Headphone jack
Attenuator button
Button for opening sub panel
Recorder selector
Preamplifier/power amplifier separator
switchBalance control
Loudness compensator on/off button
Display mode selector button
Mono/stereo selector button

Power switch
Sub panel
Speaker output selector
Bass control
Treble control
Tone control on/off button
DAC input selector button
MC/MM selector button
Phase selector button

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

Preamplifier output
connectors (Balanced)

AC power supply connector
Power amplifier input connectors(Balanced)

Balanced input connectors
Pin ② negative ⊖, Pin ③ positive ⊕＊ Can be changed with phaseselector button on front panel

Power amplifier balanced input
phase selector switch

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/ch1-ohm load (＊)
120 W/ch2-ohm load
60 W/ch4-ohm load
30 W/ch8-ohm loadNote: ＊1-ohm operation possible with music signals only.
Total Harmonic Distortion (both channels operating simultaneously, 20 - 20,000 Hz)
0.05%
2-ohm load
0.03%
4 to 16 ohm load
Intermodulation Distortion 0.01%
Frequency Response
HIGH LEVEL INPUT

Damping Factor
Input sensitivity
and impedance

At rated continuous average output: 20 - 20,000 Hz ＋0, –0.5 dB
MAIN INAt rated continuous average output: 20 - 20,000 Hz ＋0, –0.2 dB
At 1 watt output:
3 - 150,000 Hz ＋0, –3.0 dB

800 (with 8-ohm load, 50 Hz)

Input

Input sensitivity

Input

For rated output For 1 W output (EIA) impedance

14.2 mV
HIGH LEVEL INPUT 77.7 mV
14.2 mV
BALANCED INPUT 77.7 mV
0.617 V113 mV
MAIN IN LINE
0.617 V113 mV
MAIN IN BAL
Output Voltage and Impedance
PRE OUTPUT 0.617 V 50 ohms
(at rated continuous average output)

20 kilohms
40 kilohms
20 kilohms
40 kilohms

GainTone Controls
Loudness compensator
Attenuator
S/N Ratio,
Input-converted Noise

HIGH LEVEL INPUT → PRE OUTPUT: 18 dB
MAIN IN→ OUTPUT:
28 dB
Turnover frequency and adjustment range
BASS:
300 Hz ±10 dB (50 Hz)
TREBLE: 3 kHz ±10 dB (20 kHz)
＋6 dB（100 Hz）
─ 20 dB

Input
HIGH LEVEL INPUTBALANCED INPUT
MAIN IN

Bar graph meter
Output Load Impedance
Stereo Headphones
Power Requirements
Power Consumption
Maximum Dimensions
Mass

S/N ratio at rated output(A-weighted, with input shorted)

102 dB102 dB117 dBS/N ratio
(EIA)
97 dB
97 dB
101 dB

Represents output voltage value (dB) using 26 points
With meter on/off switching function
2 to 16 ohms
Suitable impedance: 8 ohms or higher
120 V/220 V/230 V AC, 50/60 Hz(Voltage as indicated on rear panel)
168 Widle290 W
in accordance with IEC 60065
Width465 mm (18.31")
Height
191 mm ( 7.52")
Depth
428 mm (16.85")
25.3 kg (55.8 lbs) net
32.0 kg (70.6 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-220●The specifications and appearance of this product are subject to change without notice.

5年間保証K1705Y PRINTED IN JAPAN 850-2206-00（B1）