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Underwood Hifi is glad to be selling Audio GD products. Audio GD is a 18 year old Chinese company that produces state of the art products at affordable prices. Reviews all their products have been excellent.
See the great R7 MK2 review in 10audio where they say:
"When a DAC can convey the air of open space, thunderous bass, outstanding vocals, clear & extended treble, and a huge soundstage, it will certainly provide long-term listening satisfaction. The main challenge for this DAC is really a challenge for you: the R7 is so transparent and resolving that it needs high quality recordings to sound like a high-quality DAC. Give it an early digital recording, maybe from the 1980s, and you will definitely hear the immaturity of the technology. Feed the Audio-GD R7 MK2 with high quality, high resolution recordings, and you will not be surprised when the term “upgrade” fades from your thoughts."
Overall Rating: 10 LPs
Read the entire review at: 10audio review
The R7 MK2 is an all discrete, dual mono, fully balanced Class A design. It is a reference quality R2R resistor Ladder FPGA controlled PCM/DSD DAC that offers close to state of the art performance and, we feel, the best DAC that you can buy for less than the $5k of the HE version. Technology and features are all the same as the the top of the line HE less the built in regenerator. Build and parts quality are superb. And, as the HE version, it is future up-gradable with a software down load.
Compare this DAC to anything we have heard under $10k.
Inputs include Asynchronous USB, coaxial, optical, I2S and AES/EBU. It also has an input for an external clock.
Overview of this spectacular DAC
Fully discrete parts are used in a truly balanced current transmission design.
-4 sets of fully discrete and independent DSD hardware decoders.
-8 sets of fully discrete R-2R DA modules to form a two-channel balanced push-pull decoder.
-2 reference Accusilicon Femto clocks provide synchronization for the DAC. Tthey are applied to the playback of all data rates without PLL up-conversion.
-32bit / 384K asynchronous Amanero USB interface synchronized with the FPGA. USB and HDMI modules are equiped with galvanic isolators and fed by two groups of independent isolated power supplies, to avoid the mutual electrical contamination between USB and HDMI.
-The DAC uses the latest discrete servo stabilized power supply, whose performance is comparable to batteries after more than a year of calibration and optimization for each part of the circuit. The digital circuit uses new discrete servo stabilized power supplies, while the clock and the analog circuits are still powered by pure class-A power supplies to achieve the best sound, as determined during listening tests.
-The digital circuits of the whole DAC are comprised of 1 FPGA and 7 programmable chip sets which allow separating the different functional circuits and preventing interference.
-The FPGA operates in the parallel data processing mode even at the fastest data rate, and supports firmware upgrades to improve sound quality when new and better design ideas are eventually found and implemented.
-The input signal sampling rate is displayed.
-Support of an external 10MHz clock input (default is 50 ohms, can be customized to 75 ohms ).
-All digital mode settings can be changed on the front panel live.
-A firmware upgrade port is featured on the rear panel of the machine (no need to open to take off the cover to upgrade the firmware).
In order to completely eliminate the influence of jitter in the incoming signal, the R7 HE MK2 uses an asynchronous clocking process. First it reads and stores a considerable amount of signal data into a RAM buffer. It throws away the original clock of the signal source and directly uses the high-performance built-in Accusilicons Femto clock to clock the output from the RAM buffer. Since both data and clock signals are handled by the FPGA the impact of transmission on jitter is negledgeable. The jitter level is essentially the same as what is specified for the clocks. The DAC uses an asynchronous Amanero USB interface synchronized with the FPGA. It also has 4 sets of fully discrete and independent DSD hardware decoders.The power supply is servo controlled and virtually as quiet as a battery. The digital circuits are also servo controlled. It offers support for a 10MHz external digital clock.
We ship from stock out of our Georgia warehouse. We also service the product in Georgia.
We accept PayPal, Visa, AMEX, Discover, MasterCard, bank wires & money orders.
Read our over 13,700 points of AudiogoN #1 rated feedback and then call 770-667-5633 with questions or to order this fine DAC or other Audio GD products.
Add $25.00 for Canada shipments
GA & HI residents add sales tax.
Brands carried: Audio Alchemy, Audio GD electronics, Audio GE speakers, Black Ice Audio tube electronics, Bluesound servers & streamers, Core Power Technologies A/V Power conditioners & cables, DSPeaker room correction, EAT Turntables, Emerald Physics speakers & amplifiers, Focal headphones, HifiMan headphones, Iso-Acoustics, LSA speakers, headphones, turntables & electronics, Marantz Reference, Martin Logan speakers & subwoofers, Mofi Electronics, Musical Fidelity, Music Hall, Ortofon cartridges, Peachtree Audio, Project turntables, Quad, Raal headphones, Sendy headphones, Silverline Audio speakers, SPL electronics, Sumiko cartridges, Sweet Vinyl pop & click filters, Wireworld, Wywires, Zesto Audio tube electronics
Sales policies on the Underwood Hifi Inc. website at www.underwoodhifi.com