m Parallel push-pull output stage delivers quality power: 90 watts perchannel into 8 ohms m Current feedback circuit topology provides
outstanding high-range phase characteristics m Logic-controlled relays
for optimum signal routing m Tone control circuitry m Option boards
allow digital signal input or high-quality analog disc reproduction

Enjoy high-grade CD reproduction enabled by option board with highprecision MDS type D/A converter digital input. Power amplifier uses current
feedback principle for outstanding high-range phase characteristics andimpeccable sound quality. Wide-band power transistors in parallel pushpull configuration deliver 115 watts per channel into 4 ohms or 90 watts perchannel into 8 ohms.

The Accuphase E-200 series of integrated
amplifiers is one of our core product ranges,
renowned for technological excellence andimpeccable quality. The model lineup so far
consisted of the E-210, E-210A, and E-211.
With the E-212, we are now introducing afurther refined version of the E-211, featuringlatest circuit design topology and top-notch
materials. Sound quality has reached an evenhigher level than before, presenting a superbly
matched blend of performance, features, andmusicality.
The power amplifier section of the E-212
boasts excellent phase characteristics andsmooth reproduction thanks to the highly renowned current feedback principle. In the output stage, a parallel push-pull arrangement ofhigh-current power transistors designed for
demanding audio applications is used, allowing the amplifier to drive even very low impedance loads with ease. The preamplifier section has its own power supply to eliminate interaction with the power amp circuitry. Tone
controls, loudness compensator and otherfeatures let the user tailor the sound if desired.
Up to two tape recorders can be connected
for recording and playback, and terminals fortwo sets of speakers are provided, making theE-212 a flexible and attractive performer. Inaddition, various options make the E-212 evenmore versatile. A digital input board with MDS(Multiple Delta Sigma) D/A converter allows
direct input of the digital signal for example
from a CD player for ultra-pure music reproduction. An option board for reproduction ofanalog records is also available.
Parallel push-pull power unit delivers
115 watts/ch into 4 ohms or 90 watts/ch
into 8 ohms
The power transistors used in the output stage
are multi-emitter devices designed for audio
applications, with optimum frequency response, forward-current transfer ratio linear-High-current power transistors

ity, and switching performance characteristics.
By connecting these devices in a parallel pushpull configuration (Fig. 1), the E-212 achieves
low internal impedance. The transistors aremounted to large heat sinks for efficient dissipation of thermal energy. This lavish design
results in high-quality power output capabilities rated for 115 watts into 4 ohms, 105 watts
into 6 ohms, or 90 watts into 8 ohms per channel.
Current feedback circuit topology in power
amplifier section assures outstanding
phase performance in high frequency range

ure 3 shows
frequency
response fordifferent gain
settings ofthe current
feedback
amplifier. TheFig. 3 Frequency response with current feedback
graphs dem- (Response remains uniform even when gain changes)
onstrate that
response remains uniform over a wide range.
Highly reliable logic-controlled relays
To realize the shortest possible signal paths,
all switching is performed by logic-controlled
relays arranged in an optimized layout. The
hermetically sealed relays are high-quality
types developed specifically for demanding
communication applications. The contacts are
twin crossbar types plated with gold for minimum contact resistance and outstanding longterm reliability.

In the E-212, signal current rather than voltage is used for feedback. Figure 2 shows theCurrent adder
Input
Buffer

I-V
converter
Trans-impedance
amplifierAmplifierOutputGold-plated input/output
jacks connected directly to relays

Current NFB
networkFig. 2 Current feedback amplifier principle diagram

operating principle of this circuit. At the sensing point of the feedback loop, the impedanceis kept low and current detection is performed.
An impedance-converting amplifier then converts the current into a voltage to be used as
the feedback signal. Since the impedance at
the current feedback point (current adder inFigure 2) is very low, there is almost no phaseshift. Phase compensation can be kept to aminimum, resulting in excellent transient response and superb sonic transparency. Fig-Tone controls use summing active filters
for highest sound quality
The tone control circuitry in the E-212 wasspecially designed with summing active filters.
Figure 4 illustrates the operation principle ofthis circuit. The flat signal is passed straight
through, and only when an adjustment is required, thecharacteristics arecreated at
F1 and F2and added
to the signal, thereby
producing
the desired
Tone control characteristics
change.

Input

OutputBias stabilizing
circuitFig. 1 Power amplifier circuit diagram (one channel)

Fig. 4 Tone control circuit diagram(summing active filter type)This design provides efficient control without
degrading signal purity.

Strong power supply with large powertransformer and high filtering capacity

Two pairs of speaker output terminals

The power supply is the source of energy for
an amplifier. The E-212 features a massive
400 VA power transformer and two large electrolytic capacitors rated for 22,000 µF each.
This assures ample reserves also for reproduction of demanding bass passages.

The oversize speaker terminals accept evenvery heavy-gauge speaker cable. The A/B
switch-selectable outputs allow driving two
pairs of loudspeakers, while the A+B position
can be used for bi-wiring where the low andhigh frequency drivers of a speaker are connected to the amplifier with separate leads.

High-capacity power transformer and filtering capacitorsn Power amplifier assembly with parallel pushpull output stage andcurrent feedback circuitry mounted to large
heat sinkAnalog peak power meters
The large analog power meters use logarithmic compression to cover a wide dynamic
range. The peak hold function lets the user
easily monitor the output level of the rapidly
fluctuating music signal.

n Supplied remote commander RC-23
Allows volume adjustment andsource switching.

Option Boards
Other Features and Functionsn Option board handles direct digital signal
input for high-grade CD reproduction.
n Option board allows analog record reproduction.
n High-quality volume control. Supplied remote commander for volume adjustment
and source switching.
n High carbon cast-iron insulator feet forhigh sound quality.

Digital Input Board
Three types of option boards are available for the E-212: theDigital Input Board DAC-10, the Analog Disc Input Board
AD-9, and the Line Input Board LINE-9. Insert the desiredboard in the rear-panel option board slot.

DAC-10This board features an MDS (Multiple Delta Sigma)
D/A converter and has inputs for coaxial andoptical fiber connections.
It can accept the digital output signal from components such as a CD player, MD recorder, DAT
recorder, etc. (sampling frequency range 32 - 96
kHz, 24 bits).

m The DAC-10 cannot be used in the models E-407, E-406V,E-306V, E-211, C-265.
m The Analog Disc Input Board AD-10 and the Line Input Board
LINE-10 can also be used.

Analog Disc Input Boardn Loudness compensator for enhanced bass
at low listening levels.

AD-9This board contains a high-performance, high-gain
phono equalizer.
Internal DIP switches control MM/MC operation, MC input
impedance, and subsonic filter on/off.

MMMC

Gain:
Input impedance:
Gain:
Input impedance:

36 dB
47 kilohms
62 dB
10/30/100 ohms
(selectable)

Line Input Board

LINE-9This option board provides an additional set of conventional
unbalanced line inputs which can be used to connect a CDplayer, tuner, or other component with analog output.

Compensator response
Option board shown in photo is DAC-10

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)

115 watts per channel into 4 ohms
105 watts per channel into 6 ohms
90 watts per channel into 8 ohms

m Total Harmonic Distortion
0.04%, with 4 to 16 ohms load
(both channels driven, 20 - 20,000 Hz)
m Intermodulation Distortion

0.01%

m Frequency ResponseHIGH LEVEL INPUT: 20 - 20,000 Hz +0, - 0.2 dB(at rated continuous average output)m Damping Factor

100 (with 8-ohm load, 50 Hz)

m Input Sensitivity, Input Impedance
Input
HIGH LEVEL INPUTBALANCED INPUTn Rear panel
Option board
expansion slot

Sensitivity
For rated output
For 1 W output (EIA)
213 mV
22.5 mV
213 mV
22.5 mV

Input impedance
20 kΩ
40 kΩ

m GainHIGH LEVEL INPUT ➞ OUTPUT:(UNBALANCED/BALANCED)

m Tone Controls

Turnover frequency and adjustment range
BASS:300 Hz±10 dB (50 Hz)
TREBLE: 3 kHz±10 dB (20 kHz)m Loudness Compensation+6 dB (200 Hz) (Volume control setting -30 dB)

m Attenuator-20 dB

42 dB

m Signal-to-Noise Ratio
Input
HIGH LEVEL INPUTBALANCED INPUT★

A INPUT SELECTOR
LINE-BAL LINE CD TUNER
B Peak Power Meters(Decibel Scale, direct reading)
C VOLUME Control
D POWER Switch
E SPEAKER Selector
OFFA
B
A+B
F BASS Control
G TREBLE Control
H TONE Controls ON/OFF Button
I STEREO/MONO Button

OPTIONJ COMPENSATOR Switch
K TAPE RECORDER Selector
REC OFF SOURCE TAPEL BALANCE Control
M Attenuator Button
N PHONES JackO High Level Input Jacks
P PLAY, REC Jacks
Q LINE INPUTS (BALANCED)R SPEAKERS Terminals (A, B)
S AC Power Supply Connector★

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:

Input shorted, IHF-A weighting
S/N ratio at rated input
110 dB
92 dB

S/N ratio (EIA)
81 dB
81 dB

m Power Level Meters

Logarithmic compression, peak reading meterswith a dB scale calibrated for an 8-ohm loadm Load Impedance

4 - 16 ohms

m Stereo Headphones

Suitable impedance:m Power Requirements

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

m Power Consumption

30 watts idle
220 watts in accordance with IEC-65

m Maximum Dimensions

WidthHeightDepthm Weight

18.9 kg (41.6 lbs) net
23.0 kg (50.7 lbs) in shipping carton

8 - 100 ohms

475 mm (18-11/16”)
150 mm (5-7/8”)
422 mm (16-5/8”)

m Supplied Remote Commander RC-23 Remote control principle:Infrared pulse
Power supply: 3 V DC (IEC R6 batteries × 2)
Dimensions:
45 (W) × 136 (H) × 18 (D) mm
Weight:85 g (including batteries)• AC power cord
• Remote commander RC-23• Specifications and design subject to change without notice for improvements.
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K015Y PRINTED IN JAPAN 850-0121-00 (AD1)