
Accuphase C-2450 - Precision Stereo Control Center
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Blending the purely analog AAVA volume control circuit with sophisticated technology inherited from the C-2850 results in a superb S/N ratio and a refinement of expression that brings new clarity to the music. The utterly smooth operation feel of the volume sensor assembly and a top plate made of brushed aluminum with a hairline finish demonstrate a level of dedication and hands-on craftsmanship that pervades every aspect of this preamplifier. Each C-2450 is individually honed to provide nothing short of perfection.
1-year manufacturer's warranty
AAVA the operation principle is purely analog
The AAVA circuit converts the input music signal into 16 types of weighted currents which are then combined according to the position of the volume control knob. The combination of signal currents forms a variable gain circuit that adjusts the level of the music signal.
High-accuracy, high-rigidity volume sensor assembly with a responsive yet solid feel
Although AAVA adjusts the volume level by combining the output of weighted amplifiers, it is operated using a volume knob that appears similar to conventional systems. Internally however there are major differences. The volume sensor mechanism that detects the angular position of the volume knob rests on a frame extruded from a massive aluminum block and is finished with utmost precision. The volume knob feels both responsive and solid when rotated and ensures extremely accurate position detection. The entire mechanism is supported on the chassis by a floating suspension using insulators, which has the added advantage of extremely quiet motor-driven operation when the remote commander is used.
Separate unit amplifiers for left and right
The main amplification tasks such as input buffering, AAVA, balanced output, and headphone output are handled by a total of six modular amplifiers for each channel. These unit amplifiers are mounted on a glass epoxy motherboard, with left and right sections being kept completely separate. To eliminate unwanted mutual interference between the amplifiers, a sturdy frame is used to provide support. As a result, both electrical interference and physical vibrations are reliably suppressed, creating an ideal operating environment.
Separate left/right power supplies
The power supply circuitry not only acts as the energy source of an amplifier, but the current that it supplies to the load also has a significant influence on sound quality. The C-2450 incorporates four custom-made filtering capacitors which are rated for 10,000 μF and have been specially tuned for optimum sonic properties. Along with the power transformer, the entire power supply section is duplicated and kept separate for the left and right channels, resulting in a full mono construction. The entire circuitry from the input right through to the output benefits from a strong and stable supply of current which enhances the quality of the musical signal
Frequency Response | BALANCED/LINE INPUT 3 - 200,000 Hz +0 -3.0 dB 20 - 20,000 Hz +0 -0.2 dB AD INPUT [MM/40 dB, MC] 20 ‒ 20,000 Hz ±0.2 dB AD INPUT [MM/30 dB]: 20 ‒ 20,000 Hz ±0.3 dB |
Total Harmonic Distortion (for all inputs) | 0.01% |
Input Sensitivity, Input Impedance | Input Input sensitivity For rated output For 0.5 V output Input impedance AD: MM/30 dB INPUT 8.0 mV 2.0 mV 47 kilohms AD: MM/40 dB INPUT 2.5 mV 0.63 mV 47 kilohms AD: MC/60 dB INPUT 0.25 mV 0.063 mV 10/30/100/300 ohms, switchable AD: MC/70 dB INPUT 0.08 mV 0.02 mV 10/30/100/300 ohms, switchable BALANCED/LINE 252 mV 63 mV 40 kilohms/20 kilohms |
Rated Output Voltage, Output Impedance |
BALANCED/LINE OUTPUT 2 V 50 ohms RECORDER REC (with AD input) 252 mV 200 ohms |
S/N Ratio | Input Input shorted (A weighting) S/N ratio at rated output EIA S/N AD: MM/30 dB INPUT 94 dB 85 dB AD: MM/40 dB INPUT 84 dB 85 dB AD: MC/60 dB INPUT 80 dB 85 dB AD: MC/70 dB INPUT 72 dB 85 dB BALANCED/LINE 110 dB 108 dB |
Maximum Output Level (0.005% THD, 20 ‒ 20,000 Hz) | BALANCED/LINE OUTPUT: 7.0 V RECORDER REC (with AD input): 6.0 V |
Maximum Line Input Voltage | BALANCED/LINE INPUT: 6.0 V |
Maximum AD Input Voltage (1 kHz, 0.005% THD) |
MM [30/40 dB] INPUT: 310/96.5 mV MC [60/70 dB] INPUT: 9.5/3.2 mV |
Minimum Load Impedance | BALANCED/LINE OUTPUT: 600 ohms RECORDER REC 10 kilohms |
Gain (18 dB position) Gain selector switch: 12/18/24 dB switchable |
BALANCED/LINE INPUT → BALANCED/LINE OUTPUT: 18 dB LINE INPUT → LINE OUTPUT: 18 dB LINE INPUT → BALANCED OUTPUT: 18 dB LINE INPUT → LINE OUTPUT: 18 dB BALANCED/LINE INPUT → RECORDER REC: 0 dB AD [MM: 30/40 dB] INPUT → BALANCED/LINE OUTPUT: 48/58 dB AD [MM: 30/40 dB] INPUT → REC OUTPUT: 30/40 dB AD [MC: 60/70 dB] INPUT → BALANCED/LINE OUTPUT: 78/88 dB AD [MC: 60/70 dB] INPUT → REC OUTPUT: 60/70 dB |
Tone Control | Turnover frequency and adjustment range Bass: 300 Hz ±10 dB (50 Hz) Treble: 3 kHz ±10 dB (20 kHz) |
Loudness Compensation | +6 dB (100 Hz) |
Headphone Jack | Output level: 2 V (40 ohms), Suitable impedance: 8 ohms or above |
Subsonic Filter | 10 Hz: –18 dB/octave |
Attenuator | –20 dB |
Power Requirements | 120 V/220 V/230 V AC, 50/60 Hz (Voltage as indicated on rear panel) |
Power Consumption | 38 watts |
Maximum Dimensions | Width 465 mm (18.3") Height 150 mm (05.9") Depth 409 mm (16.1") ( Depth 414 mm (16.3”) with AD-2850 installed) |
Mass | 19.0 kg (41.9 lbs), 19.9 kg (43.9 lbs) with AD-2850 installed 25.0 kg (55.1 lbs) in shipping carton |