New C-2450 launched inheriting the superior
technologies from Accuphase flagship Pre-amp C-3850
and C-2850. Thoroughly seeking the ultimate in the highfidelity music playback, Accuphase is confident that thisC-2450 will make you throw into the world of true musicalworks and soak up the inspired ambience.
C-2450 is the 4th generation high-end pre-amplifier
descended from brilliant C-2400 series.
C-2450’s technical feature is 10 % lower noise
performance than C-2420, achieved by the improved
AAVA(Accuphase Analog Vari-gain Amplifier) volume
control circuit.

1The size of C-2450 is as same as the former model C2420.

2

C-2450 newly applied the aluminum “hair-line” finished
top plate. It brings an elegant atmosphere with naturalwood grain finished side panels.
**The former model C-2420 used the velvet-coated ironplate .

3

C-2450 is redesigned the operation display section tosimplify and create the sophisticated image.
Level display section is able to show both volume leveland MC load setting.
This feature is effective only if the optional dedicatedPhono Equalizer Unit (AD-2850, AD-2820, AD-2810, AD2800, AD-290, or AD-290V) is present.

4

C-2450 inherits C-2420’s internal construction as it is.
C-2450 has the dual monophonic layout with strong
power supply comes from large power transformer and 4
pieces of custom-made 10,000μF capacitors.

5

The music signal does not pass volume mechanism inAAVA. It is just a position sensor to set and adjust thevolume level.
However, the feeling of the volume knob is very
important for audiophiles.
Therefore, the volume sensor mechanism with splendid
operation feeling needed to be developed in C-2800’sproject.
It is built with CNC machining aluminum block, extrathick shaft and more.
C-2450 incorporates exactly same volume sensor
mechanism as C-2850.

6

Former model C-2420 had a small operating noise
because the motor’s vibration directly came down to thechassis when adjusting the volume with a remotecommander.
C-2450 succeeds in reducing such an operation noise bymaking the volume sensor mechanism float from thechassis to block off the vibration with specially madesilicon rubbers.

7

The former model C-2420 has excellent noise
performance, however, the output noise voltage of C2450 is 10% lower than even C-2420.
C-2450 guarantees,
SN ratio: 110dB
Input referenced noise: -122dBV

8

The AAVA(Accuphase Analog Vari-gain Amplifier) is a
volume control principle that eliminates all variable
resistors from the signal path. It is totally different fromany others.
The AAVA module in C-2450 achieves the low noise
performance by the special configuration for upper two VI converter amps.
- With a special buffer amp for the topmost.
- parallel operation for the topmost and the second level.
This newly-adopted buffer amp helps to make the V-I
converter amp’s output current double, and it results in
reducing the value of the feedback resistors and thenoise coming from them.
**In C-2420 AAVA module, no buffer amps were used forthe topmost V-I converter.

9

AD1 & AD2 inputs are available only when the dedicatedPhono Equalizer Units, AD-2800 series are installed.
C-2450 is able to store the separate phono equalizer
settings for each input when AD1 or AD2 input isselected.
An elegant high-quality remote commander is supplied
with.
**C-2420 was capable of storing the MC Load value only.

10AD-2850 is the 4th generation dedicated Phono EqualizerUnit.
AD-2850 technical features are 10% lower noise
performance than the former model AD-2820 and low
RIAA equalization error achieved by Differential RIAA
Equalizer configuration.

11

AD-2850 is the function-rich Phono Equalizer Unit.
All functions are able to be controlled with the function
buttons on the sub panel of pre-amplifier installing theunit.

12AD-2850 shows ultra low noise performance.
Its output noise voltage is 10% lower than the former
model AD-2820.

13

AD-2850 has quite unique configurations, as it consistsof two amplifiers, Head Amp and Differential RIAA
Equalizer Amp.
The first stage of Head Amp features separate input
circuitry, it switches between bipolar-transistor for MC
type cartridges and junction-FET for MM type cartridges,and realizes ultra low noise performance.
Differential RIAA Equalizer Amp is balanced input EQ
amplifier, it is designed to provide low RIAA equalization
errors when changing the AD GAIN value.

14

AD-2850 is supported by not only current models butfollowing models for backward compatibility.
- C-2800, C-2810, C-2820, C-2850- C-2400, C-2410, C-2420, C-2450- C-290, C-290VRemarks;
1. MC LOAD impedance 300Ω is not available for any
models other than C-2850, C-2820, C-2450 and C2420 due to no impedance selector button.
2. For any models other than C-2850, C-2820, C-2450
and C-2420, AD GAIN value should be unified into
MC: 60/70dB & MM: 30dB/40dB different from theinscribed values on products.

15