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Audio-GD A-2 / A2 - 2500mW Pure Class A Headphone Amplifier & Preamp
- Class A design built by discrete analog stages without any OPA or coupling caps in the signal channels.
- 2 pair accurate matched 20W (in total 80W Pcm) output transistors .
- Non- feedback ACSS and output stage designs
- 2500mW at 25 ohm Pure Class A ,drives most headphones working in pure class A
- ALPS-27 hifi grade volume port
- 14DB and 20DB gain can drive the high and low sensitivity headphones
- 3 groups input: RCA X2, ACSS X1
- Preamp output : RCA
- Headphone amp output: 6.3MM X1
- Built in two groups sound flavor settings for users tweak the sound match with the system or personal favorite
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 colouration ,(dry and harsh) .
Strong class A 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
Hi-Fi parts apply:
Though the A-2's price is low but it apply the high grade parts, include the well know good sound quality ALPS volume port , foot holes transistors ,high performance R core transformer, full aluminum chassis, CMC RCA sockets, there is no compromise on the building quality .
SPECIFICATIONS (Improvements may result in changes without notice)
S/N Ratio: >125DB (Volume minimum)
THD: <0.008 %
Gain: 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 Breadth (XLR input): 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
Dimensions: 240mm (W) X 240mm (L) X 85mm (H) (with feet, Fully Aluminium )
Accessories: Power cord x1
#starspicker #audio-gd #a2