Aqua HiFi Formula xHD DAC

The Aqua HiFi Formula xHD DAC represents a comprehensive approach to high-resolution audio conversion. At its core lies Optologic, a proprietary D/A architecture utilizing discrete resistor ladder technology with four 24-bit resistor banks and sign-magnitude converter topology. Galvanic and magnetic isolation between the FPGA and R2R converter ensures complete digital-analog separation, yielding a pristine ground plane and perfect symmetry between counter-phase halves. Operating as a filter-less DAC, the Formula prioritizes native sample rate processing without upsampling compensation, favoring emotional authenticity over instrumental metrics. Its modular construction—with each resistor bank and circuit board independently mounted on connectors—enables future upgrades and technological evolution. The xHD update introduces a hybrid XMOS xCore 200 dual-core processor paired with optimized FPGA code, supporting playback up to 768kHz PCM and native DSD512. Fully-floating USB decoding with