Audio Database


Accuphase C-11
220,000 yen(July, 1989 release)


The stereo preamplifier which concentrated the development technical capabilities accumulated over the element and many years which were selected carefully, and was developed.
The balance input-and-output circuit is carried.

The dregs cord difference input and Class A push pull output stage are adopted as the high level flat amplifier handling signals other than an analog disc, and many characteristics are elaborated in it.
Moreover, the XLR type balance connector is carried in this amplifier portion at input and output, and ideal balance transmission is possible.

Equalizer amplifier is equipped with the input circuit for exclusive use in accordance with the cartridge of MC type and each MM model.
At the time of MM input, the FET Para input circuit which can maintain high input impedance over all the frequency bands is adopted in consideration of the Output voltage/Output load impedance of MM cartridge being high.
Moreover, since signal voltage is low, it thinks that a S/N improvement is important at the time of MC input, and it constitutes the input circuit from a small element of peculiar noise selected carefully.
These changes are performed by the relay and the change of the amplification degree which suited MM/MC simultaneously with it is also performed.

Since a straight signal course is constituted at the shortest, a relay is installed in a signal course required for a change, and it is changing by the logic relay control system which controls a relay electronically.
At this time, consideration is carried out also to the quality of the important relay, and the encapsulated type relay developed especially as an object for audios is adopted. A contact is a crossbar twin system and has acquired low contact resistance and high durability.

Input sauce and volume control can be performed now with attached remote control.
In this case, in order to prevent sound quality degradation occurring, the input change considered it as the system which changes a relay electronically, and volume control has also adopted the system which sound quality degradation makes rotate little manual volume by a motor.

The tone control for which the added type filter which was excellent in the characteristic was applied to tone control is developed and carried.
It passes straight, and if needed, an original flat signal is another, and makes the characteristic, and the principle of this tone control serves as a system adjusted from a flat signal, and is advantageous in sound quality.
Moreover, in order to think sound quality as important, it is used combining a quality element, and also an ON-OFF switch is formed, and a circuit is passed at the time of OFF.

The loudness Compensation is carried in order to rectify thinking that the quantity of low-pitched sound decreased at the time of small volume by man's hearing characteristic.
The characteristic is being interlocked with volume control volume and controls the amount of reinforcement automatically.

It is also possible to carry the recording selector and to record another sauce during viewing and listening.

Rear Attached

Rating of a mode
Form Stereo preamplifier
Frequency response
Balanced Input: 1.0Hz-400kHz+0 -3.0 dB
20Hz-20kHz+0 -0.2 dB
Unbalanced Input: 1.0Hz-500kHz+0 -3.0 dB
20Hz-20kHz+0 -0.2 dB
AD Input: 20Hz-20kHz±0.5dB
THD 0.005% (with all the input terminals)
Input sensitivity (rating / 0.5V output)/impedance Balanced: 126mV/31.5mV/40kohm (20kohm/20kohm)
Unbalanced: 126mV/31.5mV/20kohm
AD MM: 4.0mV/1.0mV/47kohm
AD MC: 0.13mV/0.032 mV/100 ohms
An Output power/impedance Balanced Output: 2.0V/50 ohm (25ohm/25ohm), a XLR connector
Unbalanced Output: 2.0V/1 ohm, a RCA phono jack
Tape Rec: 126mV/200 ohm, a RCA phono jack (at the time of AD input)
Headphone jack Conformity impedance: 4ohms - 100ohms
S/N ratio (at the time of a rated input S/N /EIA S/N) Balanced:97dB/91dB
AD MM:90dB/84dB
AD MC:74dB/83dB
Input conversion noise Balanced:-115dBV
AD MM:-138dBV
AD MC:-152dBV
Maximum-except-take-off level
(0.005% of a distortion, 20Hz - 20kHz)
Balanced Output: 8.0V, a XLR type connector
Unbalanced Output: 8.0V, a RCA phono jack
Tape Rec: 8.5V, a RCA phono jack (at the time of AD input)
The AD maximum inlet pressure (1kHz, 0.005% of distortion) MM Input:270mV
MC Input:8.5mV
Minimum load impedance Balanced Output: 600ohms
Unbalanced Output: 1kohm
Tape Rec: 10kohm
Tone control Bass: 300Hz, ±10dB (50Hz)
Treble: 3kHz, ±10dB (20kHz)
Balanced Input ->Balanced Output
->Unbalanced Output
->Rec Output
Unbalanced Input ->Balanced Output
->Unbalanced Output
->Rec Output
AD MM Input ->Balanced Output
->Unbalanced Output
->Rec Output
AD MC Input ->Balanced Output
->Unbalanced Output
->Rec Output
Loudness Compensation (Volume-30dB) +6dB(100Hz)
Subsonic Filter 17Hz, -12 dB/oct
Attenuator -20dB
The semiconductor used Transistor: 37 pieces
FET: 16 pieces
IC: 33 pieces
Diode: 59 pieces
Power source AC100V/117V/220V/240V, 50Hz/60Hz
Power consumption 28W
Dimensions the width 445x height 95(piece -- it includeds) x depth of 325mm
Weight 9.3kg
Attachment: Remote commander RC-3
Remote control system Infrared pulse system
Power source DC3V
Battery SUM-3(IEC name R6) 2 piece
The maximum Dimensions Width 64x height 149x depth of 18mm
Weight 140g (Battery includeded)