Though the E-270, which was launched in 2016, was just theentry-class model , inheriting the great technologies from thehigher models, it has been attracting the audiophiles all over
the world and supporting their music life with its superb
electrical performance, sound quality and its ease-to-use.
The new E-280 employs the latest AAVA volume control
system and attains 12% lower noise performance.
And the power module section which adopts the contactless
MOS-FET switches represent a damping factor of 500.
2 options boards can be added for improved expandability,from the analog records to the Hi-res digital sources, E-280
allows audiophiles to give a direct access to every musicsource.
The evolved E-280 is irreplaceable to all music lovers with its
magnificent technology philosophy of higher-grade models.

1

The E-280 inherits the E-270’s sleek design with no subpanel, it is simple but sophisticated that contains all
required functions as an integrated amp.
The needle power meter with indication range to -50dB isable to move even at the small volume level less than 60dB.
Sampling Frequency Display has expanded to “MHz” tosupport the DAC-50 operation.

2

E-280 takes the mono block construction.
With the symmetrical arrangement of L / R power
amplifier blocks, the strong power supply with a massivehigh-efficiency transformer and two large 30000μF
specially-made filtering capacitors are installed at thecenter of unit.
AAVA circuit block is located near the front panel.
Preamplifier and power amplifier sections can be used
separately for further enhanced sound with the Digital
Voicing Equalizer DG series or a bi-amped setup driven
by separate amplifiers.

3

The rated output power of E-280 is 90W into 8ohm and120W into 4ohm.
Maximum output power is more than that.
They are 120W into 8Ω load and 150W into 4Ω load.
It is just an integrated amp but it can easily drive any lowefficiency loudspeakers in spite of their sizes.

4

The E-280 succeeds in achieving 44% noise reduction at
maximum volume position with a refined balanced input
circuit, it guarantees 107dB Signal to Noise ratio at themaximum gain.
Also, the E-280 marks 41μV of the actual noise voltage
even in usual volume level.
This is 12% lower(1.1dB) than the former model.

5AAVA(Accuphase Analog Vari-gain Amplifier) is a volume
control principle that eliminates all variable resistors fromthe signal path. This is the original Accuphase uniquetechnology.
The AAVA module in the new E-280 achieves low noiseby the fourth paralleled largest unit and the paralleledsecond largest unit in “V to I” converters.
This improvement helps to make the V-I converter amp’s
output current double, and it results in reducing the valueof the I-V converter’s feedback resistor and the noise
coming from them.
*AAVA module in the former model E-270 has paralleled
the largest two units in “V to I” converters.

6

Left and right channels are symmetrically arranged insideof the AAVA assembly board.

7

The E-280 guarantees the Damping Factor of 500,
representing 25% improvement over the former model.
**Damping Factor:
An index of speaker driving ability.
Higher Damping Factor amplifier has higher speakerdriving ability.
D.F. = 8Ω / Output-impedance8Same as other Accuphase self-standing power amplifiers,
the E-280 applies “Instrumentation Amplifier principle” inits power amplification section.
The output impedance of power amplifier is decreased by
the parallel push-pull final stage arrangement of highoutput current with the bipolar transistors of good linearity.
The low impedance design and optimized wiring andparts placement brings out the high damping factor of 500.

9

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.

10Although a mechanical relay is the most popular
component for speaker protection, it does not have highreliability and low contact resistance either.
E-280 applies a MOS-FET switch instead of mechanicalrelay for speaker protection.
Damping-Factor, reliability and sound quality are all
improved by this MOS-FET switch.
They have very low on-resistance of 1.9mΩ and highcurrent capability of 130A.
By connecting speaker terminals and PC-board directly,
the signal path can be made shorter to obtain the low
impedance.

11

To enhance the further product safety and reliability, E280 improves the protection circuit on Power amplifier
section.
・Newly-developed protection circuit
Over current protection circuit using photo-coupler isapplied, it does not affect the sound quality at all.
・Temperature-sensor
Temperature-sensors which detects the heat sinktemperature are installed on L / R both heat sinks one byone.
Thanks to this, the unit accurately ascertains the hightemperature alarm in power amplifier section.
**When these protection circuits are activate, the unit
completely cuts the speaker output off and makes thepower meters flash to indicate its abnormal condition.

12

Two option board slots on the rear panel provide thefurther expandability for PC audio and vinyl record
playback.
**E-270: One slot

13