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Audio-GD R2R11 mk2 review by Currawong
HIGHLIGHTS
- Headphone / Preamp (menu selectable)
- Remote control included
- RCA Output preamp or fixed mode (menu selectable)
- Volume memory on/off (menu selectable)
- 2 Gain modes (menu selectable)
- Headphone +6dB Gain boost option
- Neutral or warmer sound option
TECH
- Discrete R-2R NOS DAC
- Discrete transistors pre- & headphone amplifier
- Output power 3800 mW @25 ohm, driving most headphones easily.
- 4 fully discrete R-2R DA converters (2 per DA-8 board) in push-pull
- 2 discrete native DSD decoders.
- Current signal transmission design.
- USB 32bit / PCM384K / DSD512 by Amanero
- Supporting future firmware improvement updates
| Please note: The manufacturing process and design can be updated at any time without notification, bringing improvments and changes in specifications. | ||
| S/N Ratio | 100dB | |
| THD+noise | < 0.04% | |
| Frequency Breadth | 20Hz – 90KHz (-3DB) | |
| Output Level | Headphone output : 10V RMS | |
| Output power (headphone) | 3800mW/25 ohm | |
| Output impedance | 2 ohm / Headphone output – 2 ohm / DAC output | |
| Input Sensitivity | 0.5 Vp-p(75 Ohms, Coaxial) / 19 dBm (Optical) | |
| USB OS Support | Windows, Mac，IOS，Linux | |
| Sample Rates | USB PCM model: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz , 192kHz, 352.8kHz,384kHz USB DSD native mode: DSD64-512 Coaxial model: 44.1kHz, 48kHz, 88.2kHz, 96kHz, 192kHz Optical model: 44.1kHz, 48kHz, 88.2kHz, 96kHz | |
| Power | 220-240V OR 100-120V AC 50/60 Hz | |
| Power Consumption | 15W | |
| Package Weight | 4.5KG | |
| Product Weight | 3.5KG | |
| Dimensions | W240 X L280 X H85(MM, Fully aluminium，with feet, without protrusion ) | |
| Accessories | AC power cord X 1 USB cable X 1 Remote Control (Plastic) | |
R2R 11 LADDER DAC CHARACTERISTICS
- R2R-11 and R2R-15 are a breakthrough of discrete R-2R designed ladder dac’s. Audio-GD are first in the market offering high performance discrete R2R in this price-range
- Two pieces DA-8 modules equipped with ultra-high speed CPLD processors to correct the discrete resistor ladder. Unique parallel processing to achieve superb performance
- Analogue section design based on Audio-GD’s ACSS current driven technology; fully discrete transistors amplifiers
- Double stages ultra-low noise high speed power supplies offers a musical and black background and favorable transparency
- Built in Amanero combo 384 USB interface. Amanero offers satisfying USB compatibility and marvelous sound quality
- True NOS design. NOS is less sensitive to jitter and offering neutral sound. To avoid the digital artifacts exlusive noise rejection processing technology is applied
- Native DSD support. Avert switch noise when changing DSD / PCM.
- Built with purity components: KOA transistors / Vishay high low tolerance resistors , silver tin soldering and ALPS 27 volume potentiometer
- Exotic sound quality! Smooth, coherent and analogue.
- Option to set Neutral or Warm sound (Jumper setting) according to personal taste.
RESISTOR TOLERANCE
Some manufactures claim to achieve good performance becuase they use lowest tolerance ladder resistors. The following calculation example will cover this. At 16 bit the tolerance of 1/66536, 0.1% (1/1000) it is by far not enough to achieve decent performance. Even using resistors with 0.01% (1/10000) tolerance, lowest tolerance available today,cannot deliver the desired performance This is just 16 bit, imagine a 24 calculation! To process 24 bit resolution it would require resistors with a tolerance of 001%. This is purely theoretical; if this tolerance would exist the discreteness of the switch logic chips will already have too much internal impedance and will shake-up such design.The tolerance of the resistor will never solve Imperfections of a ladder.
The solution lies in the correction the ladder and not only depend on the tolerance of resistors. It’s a combination of both: Ultra-low tolerance resistors controlled by a correction technology using very high speed with parallel FPGA processing.
