Since launching E-530 in 2002, Class-A integrated amplifiers
reigned as the top model in the integrated amplifier segment, withnumbers of engineering updates.
The innovative E-800 is the totally new series of Class-A integrated
amps, thought it is just an integrated amplifier but the highpowered one that can deliver the powerful output better than theseparate systems.
E-800 has the technical features of “Ultra Low Noise” and “SuperHigh Damping Factor”.
The superb Balanced AAVA type volume control completely
cancels out any external noise and results in unsurpassed S/Nratio with the circuits driven in a fully balanced configuration.
In a power amplifier section, the same architecture as A-48 andstrong power supply is employed, it helps the amplifier easily andcompletely to drive any kind of loudspeaker.
The E-800 realizes the ideal form of audio playback balancing bothClass-A operation and high power, We believe it just grabs not only
audiophiles’ but music lovers’ hearts.

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To realize the separate-system sound quality, E-800 is
given a new type of big and firm enclosure for a
integrated amplifier.
** E-650: Width 465mm, Height 191mm, Depth 428mm,
Weight 25.3kg

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The 30 segment digital power meter with -50 dB
indication range is able to swing even at the small
volume level less than -60dB.
** The power meter of E-650 has 26 segment.
3 lines of balanced inputs are equipped for various input
source.
**E-650 has 2 lines of balanced inputs.

3E-800 has a mono-block construction. The strong power
supply with a massive special made high-efficiency
toroidal transformer and two large 60000μF special madefiltering capacitors are installed in the center of the unit.
In addition, the two power amplifier units are kept
separate for the left and right channels.
Balanced AAVA module is set at the front of the unit toavoid the noise interference. The accurate operation is
performed with the custom-made high-accuracy volumesensor.
The volume sensor is upgraded from the one in C-2850.
It makes the movement smooth and the moving soundby the remote commander even gets smaller than before.

4The rated out put power is fully linear power progressionof 50W into 8 ohm, 100W into 4 ohm, and until 200W into
2 ohm. Even 1 ohm load condition, it can deliver 300Wpower.
E-800 can easily and completely drive any kind ofloudspeakers like powerful separated power amplifiers.

5E-800 marks 104dB of the guaranteed S/N Ratio.
This is 25% lower (2dB) than E-650.

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The AAVA (Accuphase Analog Vari-gain Amplifier) is a
volume control principle that eliminates all variable
resistors from the signal path. It is totally different fromany others.
E-800 employs two AAVA modules per channel with afully balanced configuration from the input to the output.
Tone control system which is the post stage of AAVA
works as balanced AAVA circuit as well.
The power amplifier section can receive those positive
and negative signals at the same time by the
instrumentation amplifier topology.
It works as the totally balanced circuit which is tolerant tointernal and external harmful noise.
The gold-plated signal paths also contribute to the longterm reliability and maintaining the sound quality.

7E-800 achieves 1000 of guaranteed Damping-Factor.
It is 25% higher than E-650.
*Damping-Factor, DF:
An index of speaker driving ability. Higher DampingFactor amplifier has higher speaker driving ability.
DF = 8 ohm / Output-impedance

8The output impedance is made lower by 6 parallel pushpull final stage arrangement of MOS-FETs.
Circuit configuration of the power amplifier engine is assame as the latest Class-A Stereo Power amplifier A-48.
E-800 features the new power MOS-FET device which isheavy-duty and has the large rated current characteristic.
**Current capacity of power MOS-FET
E-650’s MOS-FET(VISHAY): 21AE-800’s MOS-FET(Fairchild): 33A

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Remote Sensing is the technique to lower the output
impedance of amplifier by the negative feedback withsignal sensing from nearby the speaker terminals.
Balanced Remote Sensing is the technique to make theoutput impedance even lower by both the signal sensing
and the GND sensing, that is the negative feedback ofGND level.
Not only Damping Factor, but also Total Harmonic
Distortion and Intermodulation Distortion are all improvedby the Balanced Remote Sensing.

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Mechanical relays are the common components for speakerprotection but the contact resistance of mechanical relay ishigher than people think.
Therefore, Accuphase has chosen the MOS-FET switch
instead of conventional mechanical relays for speakerprotection.
Thanks to this MOS-FET switch, the Damping Factor,
reliability and sound quality are all improved.
E-800 features the new MOS-FET device for this switch
which has very low on-resistance.
**On-resistance of MOS-FET device
E-650’s MOS-FET: 1.6mΩ
E-800’s MOS-FET: 1.0mΩ
E-800 employs carefully-selected very low-impedancecomponents such as the large speaker terminals and so on.
Making signal paths thick and short also helps attaining thelow impedance.
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The newly designed output protection circuit can detect
any short-circuiting of the speaker terminals with due
consideration for the product safety.
Temperature-sensors which detects the heatsink
temperature are installed on the heatsink(2 sensors on aheatsink). Thanks to this, the unit accurately ascertains
the high temperature alarm in power amplifier section.
Moreover, the new circuit is added that the temperature
at output stage is controlled not to rise by decreasing theidle current.
Thanks to the photo-coupler, the detected signal iscompletely isolated from the output signal to minimize
the negative effects on the sound quality.
**When these protection circuits are activated, the unit
completely interrupts speaker output and makes thepower meters flash to indicate the abnormal condition.
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Two option board slots on the rear panel provide thefurther versatility of PC audio or vinyl record playback.
Not only the sampling frequency of digital input signal isshown in the multi function display but selecting thedigital input and MC/MM setting is also performed on thefront panel.

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