The decoder Formula newly launched by Aqua Italy. See the physical map for the interface. Three-year licensed warranty(The maintenance fee is free for non-human reasons, and the customer has to bear the freight).
The internal circuits of Formula are all developed by aqua, including DAC decoding, are designed for themselves, using resistor ladder(Resistance network)In this way, each channel uses two sets of resistance circuits, which is very feverish. After the digital signal enters the resistor ladder, it is processed by the FPGA. In order to isolate the digital and analog cross-interference, the signal generated by FGPA uses optocoupler (optical coupler) isolation. Of course, Formula does not have non oversampling (NOS). Aqua believes in the original taste, and the digital conversion analogy that pursues optimization and is loyal to the original signal is a good sound! Each circuit board of Formula can be upgraded independently. In the future, if there is a better technology, it can be easily upgraded at any time. Its power supply uses two C-Core transformers, and the digital analog is independently powered. Angstrom amplifier and Diesis speakers were used on site.
So this is still a NOS decoding of R2R structure and R2R of discrete resistors. As for Optologic, it refers to optocoupler isolation technology. There are six sets of digital inputs on the back of the machine, and the casing is still of that special material, which is similar to the lower-level products La Voce and La Scala. The whole machine is not very heavy, it is not the kind of stupid and heavy stacking machine.