Kenmerken
- 2500mW Pure Class A Headphone Amp & Pre-amplifier
- Audio-gd in-house developed ACSS technology
- Non-Negative Feedback design
- Full Discrete Transistors Design
Specificaties
Verbetering kan leiden tot wijzigingen in specificaties en ontwerp zonder voorafgaande kennisgeving. | |
S/N Ratio | >125dB (Volume minimum) |
THD (THD) | <0.008 % |
Krijgen | Gain L : +14dB Gain H : +20dB |
Headphone amp Output Power ( Pure Class A ) |
25 ohm: 2500mW 40 ohm: 1600mW 100 ohm: 650mW 300 ohm: 325mW 600 ohm: 160mW |
Preamp Output Level (Max) | 8V @ RCA |
Input impedance | 47K ohm @ RCA <10 ohm @ ACSS |
Frequency Response | 20Hz – 20KHz ( +/- 0.3DB ) 10Hz – 125K (+0dB, -3dB) |
Power Requirement | 1 Version 100-120V AC 50/60 Hz 2 Version 220-240V AC 50/60 Hz |
Power Consumption | 20W @240V or 120V |
Package Weight | Approximately 3.5KG |
Dimensies | W240 X L360 X H80 (mm, black aluminum ) |
Accessoires | Power cord X1 |
IMPEDANCE MATCHING
There are a lot different quality DACs. They had different design and output impedance . To avoid negative effect on sound quality by differences in DAC’s output impedance, in the A-2, we have design a pair diamond differential buffers in the input . All the RCA input signals go through these buffers, the output impedance become very low, even if the source have high or low output impedance.
The diamond differential buffers working in pure class A , and it has a short signal journey. this way we can keep the sound quality without coloration ,(dry and harsh) .
CLASS-A ANALOGUE OUTPUT STAGES
The A-2 have in its design a pare diamond differential output stages.
The output stages have two pairs of 20W transistors offer 2500MW at 25 ohm Class A ,drive most headphones (work in pure class A ) ,no matter if you have low sensitivity headphones
ACSS – Current Amplification
Audio-GD has developed an advanced current-driven amplifier technique. Also known as ACSS, Audio-GD Current System Signal. This special technique ensures that the signal travels a much shorter path and that ensures a more transparent, faster and more neutral reproduction. A similar technique is used by, for example, KRELL. The Current Conveyor technology mostly components are the current mirror. The Current Conveyor technology isn’t a new technology, at 1966 , professor K.C. Smith and A.S.Sedra publish the concept “current mode analogue circuits “ .
HIGH PRECISION VOLUME CONTROL
Volume control is accomplished by a hi-graded ALPS-27 potentiometer.
R-CORE TRANSFORMER
De DAC bestaat uit een afgestemde R-cores transformator met laag geluidsniveau en lage fluxlekkage. In totaal 65W voeding voor alle digitale onderdelen en de linker en rechter analoge borden. De gelijkstroom wordt verdeeld over gescheiden vermogensregelaars. Ze zijn allemaal pure klasse A geluidsarme shunts; gevoed door lineaire voedingen. Dit resulteert in een ultrahoge snelheid en schone kracht voor alle afzonderlijke onderdelen.
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