Eversolo details DAC-R8 resistor-ladder DAC and preamp

Eversolo has detailed its forthcoming resistor-ladder converter and preamplifier. The Eversolo DAC-R8 uses the company's proprietary OriginR2R discrete conversion architecture and supports PCM audio up to 32-bit/768kHz and DSD playback up to DSD512.

PCM conversion uses a segmented 5+20-bit design, with the 5-bit section handling larger conversion steps and the 20-bit section handling finer adjustments. An FPGA manages digital filtering and switching timing. DSD signals use a dedicated native 1-bit conversion path, avoiding conversion to PCM before reaching the analogue stage. Both conversion paths share the same precision resistor network.

The DAC-R8 employs fully balanced R2R analogue volume control using relay-switched precision resistor arrays. Digital processing options include NOS, OS with selectable 2×, 4× or 8× oversampling, and BEST modes, alongside six FIR digital filters. A browser-based control interface provides equalisation, filtering, dynamics processing and delay settings via USB. These controls allow independent adjustments for the left and right channels.

Digital inputs comprise USB Audio, I²S, AES/EBU, coaxial, optical and HDMI ARC/eARC. The AES/EBU and coaxial inputs feature electrical isolation. An in-house-developed 10MHz oven-controlled crystal oscillator provides timing, while a custom O-core linear power supply supplies the circuitry.

The front panel has a 5.2-inch IPS display that presents operating information, spectrum analyser graphics and VU meter views. The DAC-R8 can also form a dedicated digital source system with Eversolo's T8 streaming transport.