The Heed Audio Abacus is a high-fidelity digital-to-analogue converter (DAC) that can be upgraded to a streamer with an optional expansion card. Designed and handcrafted in Hungary, it caters to audiophiles seeking a natural and musical sound signature. Key Features Digital Inputs: 1x RCA coaxial, 1x BNC, 2x optical (TOSLINK), 1x asynchronous USB-B, and 1x expansion slot for an optional streamer card. Analogue Output: 1x line-level RCA. Output Level: 2.1 Vrms. Frequency Response: 3 Hz to 50 kHz (dependent on sampling rate). Digital Audio Support: PCM: Up to 384 kHz / 32-bit via USB. DSD: Native DSD64 and DSD128 support. Construction: Discrete analogue buffer stages and isolated digital/analogue sections to minimise interference. Power Consumption: Maximum 50 VA. Dimensions: 22 cm (W) x 8.7 cm (H) x 32.5 cm (D); Weight: 4.5 kg. Streaming Capabilities (with Expansion Card) By installing the optional streamer card, the Abacus transforms into a full-featured network streamer with: Roon Ready certification Spotify Connect Tidal integration UPnP/DLNA support