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Design Features:
C-3 Final version applies ACSS (Current Audio
Signal Transmission) technology. The heart of our ACSS technology is in
the ultra low distortion BPM-7110 V2 module. The sound of C-3 Final
version is neutral and faithful-like, very neutral and sounds
exceptionally clear and transparent. Soundstage is precise, three
dimensional and huge, detailed and lifelike midrange, and transparent
treble with tight and extended bass.
This circuit has exceptionally high sound
restoration ability. With this excellent preamplifier, you can input
not only XRL balanced signal or RCA unbalanced signal, but also the top
grade ACSS current signal. It can also output RCA signal, balanced XRL
signal, ACSS current signal to the power amplifier. No matter what kind
of signal it is input, it is able to transfer it to current signal and
amplify it.
C-3 Final version adopts a complete separation
of left and right channels and digital display control. Three special
transformer are used to supply power separately for the audio and
control circuit. The signal amplifying section and the voltage and
control session are separately installed in different machine boxes,
which further promotes the transparency of tone to its peak.
To achieve a better effect, C-3 Final version
also employs the complex Three-stage parallel stabilized voltage supply
to get a purer power supply so that a better sound quality is
guaranteed. C-3 Final version uses a new power supply model, Current
Transfer Power Supply.
C-3 Final version uses heavyweight all aluminum alloy box to prevent
the eddy current of transformer from interfering on circuit board. Two
empty chassis net-weight is 16KG. Furthermore, the interior is
separated into 2 sections with aluminum boards for the best channel
separation.
All the sockets of C-3 Final version are
Hi-End grade products. It is sealed by WBT silver solder. Everything we
do, we do for a better audio and sensational effect.
The control function of C-3 Final
version is very user friendly. The switch of volume adopts IV method
which effectively decreases the effect on tone quality. The change of
volume applies another way, too. To lower the control circuit's
interference on audio circuit, we apply high-speed optocoupler to separate
control signals and executing sessions, which is the way that other
high-sky price imported equipments adopts to improve quality.
Without operation, the control circuit is stopped and the control
signal is temporarily stored in the memory which also outputs direct
current level to control the executing session. It will effectively
eliminate the detrimental effect caused by long-duration data output
of ordinary control circuit.
C-3 Final version has memory function. It can
independently memorize the status of the 6 input channel groups,
maintain them even when the machine is shut down. Unlike machines
without memory function, the users don¡¦t need to adjust the input
channel and volume every time they open the machine. This function
brings a more convenient and pleasant way for the users to enjoy music.
The input channels of C-3 Final version adopt
separated shielding method. When switching, the idle signal lines
linked to the equipment and the ground wire are completely
disconnected. The idle input ports of the equipment are shielded. In
that case, the tone quality won¡¦t be affected even with more connected
equipment.
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About volume in ACSS circuits:
C-3 Final version uses ACSS technology, which is
very different from conventional technology.
In conventional technology the gain is fixed, like 3DB or 6DB.
But in ACSS
technology the gain changes with volume, and while you close the
volume, the gain is -80DB or -100DB (in conventional technology it
can't work lower than 0DB).
While you are listening in normal
volume, the gain may be around -50DB, or between -80 to +12DB.
The volume control is also
different from conventional technology. Conventional technology volume
control is placed in the input, and attenuates the signal.
But in ACSS, it is placed at the
ACSS modules output, where the output is the current signal, not the
voltage signal. The volume control is I/V conversion, and the volume
depends on the current (I) conversion to the voltage (V). (Like D/A
chips output I/V conversion)
As you can see, ACSS circuits have
no gain, as it is a completely different circuit.
The sound quality benefits from
I/V change volume control. Mark Levinson also knows that current
volume control has great benefits, so in their Top End preamp NO.32
volume control, they use many components to change the signal to become
current signal (I), then through the R-2R network to control the
volume, and then change back to voltage signal (V) again. But C-3
Final version is simply a more complete work in terms of the current
signal, and technically, it is superior to conventional technology.
ACSS is fully non-feedback with
very low distortion, so sound is neutral (neutral and faithful) because
it has no feedback effect.
How to
choose the settings in C-3 Final Version:
With the C-3 Final version, the user has a choice
of 70 steps and 99 steps of volume control, and you can also choose
whether to have volume memory.
1. Choose 70/99 steps volume control:
Step A: Push in the "Debug" switch.
Step B: The display shows as pictures below.
Step C: Turn the volume knob; choose between 70 or 99 on right.
Step D: Push out the "Debug" switch.
70 step
volume
control
99 step volume control
2. Choose volume memory:
Step A: Push in the "Debug" switch.
Step B: Turn the selector knob; the display shows as pictures below.
Step C: Turn the volume knob; choose between "ON" or "OF" on left.
Step D: Push out the "Debug" switch.
Volume memory
active.
Volume memory off.
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