睿志音响

Note: Because applied the high performance transformers, the C-400 transformers shield box had removed.

About ACSS:
ACSS (Audio-gd Current Signal System) is Audio-gd's system for transmitting audio signals in the current domain. This concept, first seen in 1966, we have used for many years, and since 2006, have evolved the technology to include all audio signals in our systems from the digital source to the power amplifier. Since 2007, ACSS components have become Audio-gd's most popular products.

Technical features:

    Dual mono design: genuine Class-A current transmission gain circuit design from signal input to output. At the input stage, audio signal in voltage mode will be transformed into current mode beforehand and the signal remains intact through the gain stage to the output stage. If the input signal is in ACSS mode, it will reach the gain stage directly for ACSS signal amplification.

    All signal amplifications are in current mode, achieved by the unique open loop multiple output current mirror and with good open loop linearity. It yields ultra high precision yet very low distortion to the gain circuit, and all transistors are working in Class A status.

    No total negative feedback circuit is in the amplifier, which could only be achieved by very linear current transmission amplifier with ultra-low distortion which produce open, clean and pleasing sound.

    Driving stage of ultra-low distortion provides output stage with high speed and linearity, yet minimal exposure to effects of low resistance or low reactance loading.

    32 pieces of high power transistors rated at 15A are used and working in Class A mode which guarantee most existing speakers docile.

    Parallel regulated power supply makes signal immune from interference of AC power, signal of high purity could be expected.

    Two toroid 650w transformers (total 1300W) made with imported high quality cores are sealed in isolated metal box, getting rid of interference to the critical amplifier circuit. The circuit thus could work in a quieter and cleaner environment. Filtering capacitors of 120,000uF in total guarantee ample power supply even to highly dynamic signal.

     Please note: Because we upgrade the transformers so the transformers shield box had cancel without any sound quality and S/N degrade.

How to choose the functions in C-400:
       With the C-400, 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; chooses between 70 or 99 volume steps display 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; makes the display show as pictures below.
Step C: Turn the volume knob; choose between memory "ON" or "OF" on left.
Step D: Push off the "Debug" switch.
Volume memory active. Volume memory off.

C - 400 Specification:
　

Improvement may result in changes in specifications and
design without notice.
　

Power output	200W(4Ohm，THD <0.1%，C-400)
Power output	100W(8 Ohm，THD <0.1%，C-400)
Frequency breadth	20HZ-20KHZ(+0DB,-0DB)
Slew rate Etc	220V/uS（CAST输入时）
N/S	116dB（Volume is Min，CAST model）
Input max level	0.5VRMS (RCA/XLR input) 2MA (CAST input)

	Wisdom in mind, enthusiasm at heart.