T + A is a brand that they are constantly renewing their successful products, as an affirmation, the theory can be further improved and the application can be even more diverse. DAC 8 DSD is a story of crystallization simplicity from the most complex requirements.
As the updated version of DAC 8, the notable points about circuit design pioneering application in DAC 8 DSD is the strength to bring the quality of equipment far beyond many competitors in the same price range as well as calculation. power.
The body is completely matte black, rounded corners and sandwiched between two thin silver aluminum panels. There are four small screws on the roof and four metal feet lined with rubber under the sole. The front has 11 small buttons and display screen, a headphone jack.
The start button is on the left, there is a cluster of 4 buttons below for input information, DAC 8 DSD will automatically remember this information. Users will know which lane is being selected through the green indicator light. The next node cluster selects between forward and reverse polarization, representing four digital filters and Clean or Wide mode. Finally, there are two volume rocker buttons, which are quite different from the traditional knob but in return, harmonizing with the overall and working well. The audio range runs from 0 to 64, and has two independent volume levels for front and headphones inputs.
The high resolution monochrome display of the DAC 8 DSD is quite small, but still very clear and easy to see, when booting will run the full command information then only display the input sampling rate. Because the 8DSD DAC accepts direct reading of DSD files from USB, the screen will indicate the mHz ratio. Users will quickly become familiar with this expression through a conversion table included in the user guide.
On the back side, the left hand side is balance / unbalance for analog, Variable / Fixed switches and RCA digital output. In the middle, layout of inputs including S / PDIF (RCA), BNC, optical, AES / EBU, and USB. USB ports accept PCM standards up to 32-bit / 384kHz and DSD up to DSD512; DSD256 and DSD512 alone are available with USB streams of the Windows operating system. Finally, the Ethernet port and a Ctrl (control) interface are used in combination with intelligent home control systems such as Crestron or AMX. Considering that, the only missing feature of DAC 8 DSD up to this point is MQA technology.
In particular, DAC 8 DSD is designed to dissipate heat quite well, can operate for many hours but the temperature is only about 33 degrees. Accompanying the machine is a plastic remote, which is very sophisticatedly designed like other high-end products.
DAC 8 DSD is equipped with a number of technologies developed for other high-end products of T + A, most notably the separation of two signal lines for PCM and DSD. This means that DAC 8 DSD has two D / A converters with real 1-bit values, instead of having to switch from DSD to PCM. The switching circuit for PCM is the Quadruple Converter, using 4 DACs with a dual differential configuration channel, completely eliminating the conversion and non-linear errors while the dynamic range increases every 6dB. With the DSD part, T + A engineers use an exclusive design to prevent signal transfer to PCM.
After being transferred from PCM / DSD, the signals will be sent to the analog area by the same technique on the most advanced product line of T + A – HV Series. This process is further supported with a completely separate I / V converter circuit with selective high frequency conductors, a separate analog recovery layer suitable for FET field transistors.
Finally, the signal will be transferred to the correct resistor ladder, the design is completely symmetrical, balanced. T + A also noted, DAC 8 DSD uses high quality switches instead of gold relay relays like high-class lines. The resistors in the volume controller are also from the surface paste in the Vishay MMU series.
Another noteworthy feature of DAC 8 DSD is to customize Clean / Wide to avoid overheating the system. Analog filter with small angle coefficient is used to eliminate any noise from DSD source. According to Lothar Wiemann, T + A’s chief engineer, “DSD64 signals have a lot of high-band noise and increase dramatically from 20kHz or more, leading to a myriad of problems such as intermodulation modulation and tweeter inductor temperature. increase. All of these effects are negative with sound, and can be avoided by properly filtering high-frequency noise. ”
Therefore, the Clean feature is actually using a light slope, starting at about 30kHz, filtering unwanted noise high frequency noise when playing music from DSD 64 files. Wide features are used for other formats, PCM or higher proportion DSDs have lower background ultrasonic noise than DSD 64. T + A also recommends that customers use its products to make Wide mode for all situations.
In DAC 8 DSD, every detail, technical calculation has a clear purpose, and the most interesting thing, is that all these factors, aim to maximize people’s freedom of choice. use. Equipped with up to 4 filters – 2 FIR filters and 2 Bezier filters, together use 56 bit data for internal processing on high-speed platform for DAC 8 DSD keeps accumulated errors at minimum.