Commentary

The Stereo Control Center has refined its performance and sound quality by following up on the technologies accumulated so far.
The model name of the 200 series has been inherited as a successor to the C-200 series of separate amplifier which has been the main pillar since the foundation.

The amplifier uses a current feedback amplifier circuit that feeds back the output signal in the form of an electric current.
In this circuit, the impedance of the input terminal on the feedback side is lowered to detect a current, and the current is I-V converted by a transformer impedance amplifier to produce an output signal. Since the impedance of the feedback input part is low, phase rotation hardly occurs, and various characteristics can be greatly improved with a small amount of NFB.

The line amplifier unit is a pure complimentary service push-pull circuit with 3 parallel input elements for low noise. It is a current feedback amplifier circuit and consists of discrete parts.

The C-245 is an AccuPhase original MCS (Multiple) with a fully independent 6-child line amplifier unit of 3 parallel x2 configuration. By integrating the left and right line amplifier units into two line amplifiers with three parallel connections, various characteristics such as S / N ratio and distortion factor have been greatly improved.

Six line amplifiers, balanced input amplifiers, and balanced output amplifiers are completely independent to create a total of 10 unit amplifiers on the left and right sides.
These unit amplifiers are firmly fixed with a frame material so that they do not interfere with each other, preventing resonance due to external vibration.

The power transformer, filter and condenser are independent on the left and right sides and are electrically monaural.
A wide-band low-impedance power supply is provided for all unit amplifiers, and each amplifier is equipped with a dedicated power supply to prevent mutual interference between the amplifiers.

The tone control features an additive active filter tone control.
In this method, the original flat signal passes straight through, and characteristics are controlled by making another characteristic as necessary and adjusting it from the flat signal.

It uses a logic relay control method to configure the shortest and straight signal path.
The relay used for this is a closed type relay for the communication industry. The contact is gold-plated and crossbar twin system, and the quality of low contact resistance and post-durability is high.

Equipped with a balanced input terminal.

Uses insulator made of high carbon cast iron.

Equipped with an EXT PRE function for enjoying with an external preamp.

It is equipped with a compensator function to increase the bass range when the volume is low.

It comes with a remote commander that can change volume and input.

An option board can be added to the option slot on the rear panel.

Model Rating

Type	Stereo Control Amp
Frequency Response	Balanced, Unbalanced input : 3 Hz ~ 300 Hz + 0 -3.0 dB 20 Hz ~ 20 kHz + 0 -0.2 dB
Total Harmonic Distortion Factor	0.005%
Input Sensitivity / Impedance (Rated Output / 0.5 v Output)	Balanced : 252mV/63mV/40k Ω Unbalanced : 252mV/63mV/10k Ω
Rated Output / Impedance	Balanced, Unbalanced output : 2V/50 Ω Tape rec : 252mV/200 Ω
S/N, input conversion noise	Input Short A - Correction S/N at rated output Input Conversion Noise EIA S/N Residual Noise Balanced: 108dB -120dBV 97dB 1.0 μ V Unbalanced: 121dB -133dBV 97dB 1.0 μ V
Maximum power level (0.005% distortion rate, 20 Hz to 20 kHz)	Balanced, Unbalanced output : 5.0 v Tape rec:5.0V
Minimum Load Impedance	Balanced, Unbalanced output : 600 ohms Tape rec : 10k Ω
Gain	Balanced, Unbalanced input → Balanced, Unbalanced output : 18 dB Balanced, Unbalanced input → Rec output : 0 dB
Tone Controls	Bass (300 Hz) + / - 10 dB (50 Hz) Treble (3 kHz) : ± 10 dB (20 kHz)
Loudness Compensator	+ 6 dB (100 Hz, Volume -30dB)
Attenuator	-20dB
Headphone jack	Applicable Impedance : 8 Ω ~ 100 Ω
Power Supply	100 VAC, 50Hz/60Hz
Power Consumption	16W
Maximum External Dimensions	475 mm wide x 150 mm high x 409 mm deep
Weight	16.8kg
Included : Remote Commander RC-20
Remote Control Method	Infrared Pulse Method
Power Supply	DC 3V
Dry Battery	AA, 2 pcs
Maximum External Dimensions	55 mm wide x 194 mm high x 18 mm deep
Weight	100g (including dry batteries)
Sold Separately : Option Board
No Image Digital Input Board DAC-10 (¥ 50,000) Equipped with MDS (multiple ⊿ Σ) D/A converter, digital outputs such as CDs can be connected. Sampling frequency : 32 kHz to 96 kHz, 24 bit It has coaxial and optical fiber input terminals. Line Input Board Line-10 (¥ 8,000) General, unbalanced high-level input terminal. Play analog signals such as CD players and tuners. Analog Disk Input Board AD-10 (¥ 50,000) Equipped with a high-performance high-gain equalizer, it is compatible with all types of cartridges. MM/MC switching, MC input impedance and subsonic filter on/off can be set by the internal DIP switch. MM Gain : 29 dB Input impedance : 47k Ω MC Gain : 60 dB Input impedance : 10, 30, 100 Ω switching