Audio Database


Accuphase E-406V
380,000 yen(December, 1996 release)


Integrated amplifier which the Accuphase supplied the technology cultivated by development of separate amplifier, and developed as a new reference model of integrated amplifier.

The power transistor for the Oide power audios excellent in many characteristics, such as the high frequency characteristic, a current gain linearity, and switching, is adopted as the output element of a power amplifier part.
By constituting this element from a 3-parallel push pull, the power which had realized operation stabilized to change of load, and was excellent in a reactance component and low impedance load drive capability is demonstrated.

The current feedback magnification circuit without phase rotation is adopted as a power amplifier part and a line amplifier part.
In this circuit, the impedance of the input terminal which is a return side was lowered, current was detected, I-V (current-voltage) conversion of that current was carried out with the transformer impedance amplifier, and the output signal is made. For this reason, since the impedance of a return input portion is low, it is hard to generate phase rotation, and there is almost no necessity for phase compensation.
By this, many characteristics have been sharply improved by a little NFB(s), it excelled in dynamic characteristics, such as a standup, and the natural energy response is realized.

The pure complimentary push pull circuit which carried out the dregs coding of the first class magnification stage is used for a line amplifier part. This consists of discrete parts by a current feedback magnification circuit.
Phase compensation of each stage could be made light by this, and more natural sound quality has been obtained.

Tone control of the added type active filter system currently used for the full-scale graphic equalizer is carried in the tone control part.
By this system, it passed straight, if needed, the original flat signal was another, made the characteristic, is making it adjust from a flat signal, and has controlled the characteristic.

Since a straight signal course is constituted at the shortest, the logic relay control system has been adopted.
The encapsulated type relay for communication industry is adopted as the relay to be used, and contacts are a plated with gold and a crossbar twin system, and have realized low contact resistance and quantity durability.

The efficient Troy Dahl type power transformer which became independent in power amplifier / preamplifier part is adopted as a power-source part, and the mutual intervention between amplifier is prevented.
Since a toroidal transformer is the structure of coiling thick copper wire around a doughnut-like core, it has the feature that impedance is low, and is small and conversion efficiency is high. Furthermore, the toroidal transformer adopted by E-406V has a section of an iron core close to a circle, can also roll a coil closely circularly, since adhesion nature is good, there are few losses, can do weight lightly and makes small the leakage flux at the time of load. Moreover, iron loss and in rushes current are reduced by enlarging the rate of a bulk density of copper wire for the cross-sectional area of an iron core small.

The large-sized terminal of brass Naked material shaving appearance which can respond also to a very thick speaker cable is adopted as a speaker terminal. Moreover, it can be used being able to change two lines and bi-wiring connection is also supported.

The large-sized power meter which monitors output electric power is carried.
this meter -- logarithm compression -- since type, a large dynamic range can be seen at once.

An input selector side can input eight lines and two tape recorders, and also two balance inputs are carried.

A preamplifier part and a power amplifier part are separated and the changeover switch and its input-and-output terminal for using it as independent amplifier are carried.

Two slots which can insert an option board easily are carried in the rear panel, and the option boat corresponding to an AAB interface standard can be added.

Rear Option
Logic Troy Large-sized

Rating of a mode
Form Integrated stereo amplifier
Rated continuation average output
(Both channel operation, 20Hz - 20kHz)
220 W/ch (4ohms)
170 W/ch (8ohms)
THD (both channel operation) 0.02% (4ohms - 16-ohm load)
IM distortion 0.01%
Frequency response
Main amp input: 20Hz-20kHz+0 -0.2 dB (at the time of a rated continuation average output)
2Hz-150kHz+0 -3.0dB (at the time of 1W output)
High Level input: 20Hz-20kHz+0 -0.2 dB (at the time of a rated continuation average output)
Dumping factor 120 (8-ohm load, 50Hz)
Input sensitivity/impedance
(An Output power / EIA1W output)
High Level input: 147mV/11.2mV/20kohm
Balanced input: 147mV/11.2mV/40kohm
Main input: 1.47V/112mV/20kohm
An Output power/impedance Pre output: 1.47V/50 ohm (at the time of a rated continuation average output)
Gain Main input -> output: 28dB
High Level input -> Pre output: 20dB
S/N, input conversion noise
Input short-circuit and A-compensation EIA S/N
At the time of a rated input S/N Input conversion noise
Main amp input: 127dB -123dBV 103dB
High Level input: 113dB -130dBV 82dB
Balanced input: 90dB -108dBV 82dB
Tone control Low-pitched sound (300Hz): ±10dB (50Hz)
Loud sound (3kHz): ±10dB (20kHz)
Loudness Compensation + 6dB (100Hz, Volume-30dB)
Power meter Logarithm compression type peak level display
dB scale and the output Direct reading at the time of 8-ohm load
Load impedance 4ohm-16ohm
Headphone jack Conformity impedance: 4ohms - 100ohms
Power source AC100V, 50Hz/60Hz
Power consumption 55W (at the time of no inputting)
350W (Electrical Appliance and Material Control Law)
585W (at the time of an 8-ohm load Output power)
The maximum Dimensions Width 475x height 180x depth of 423mm
Weight 23kg
Attachment: Remote commander RC-20
Remote control system Infrared pulse system
Power source DC 3V
Battery AA -- type (SUM-3/R6) and two pieces
The maximum Dimensions Width 55x height 194x depth of 18mm
Weight 100g (Battery includeded)
Option: Option board
The Line-in board Line-10 (8,000yen)
The common high-level input terminal of an imbalanced system.
Analog signals, such as CD player and a tuner, are played.
The Analog disc input board AD-10 (50,000yen)
All cartridges are supported by loading of a highly efficient high gain equalizer.
With an internal DIP switch, a MM/MC change, MC input impedance, and Subsonic-Filter on/off can be set up.

MM Gain: 29dB
Input impedance: 47kohm
MC Gain: 60dB
Input impedance: 10, a 30 or 100-ohm change