AQUA Formula xHD Rev. 2 DAC

FEATURES:

The AQUA Formula xHD Rev. 2 is a highly acclaimed and reference-level digital-to-analog converter (DAC) designed and manufactured by the Italian company AQUA.

DESIGN AND TECHNOLOGY:

• Employs AQUA’s proprietary “Optologic” D/A conversion system, which is an FPGA-based digital decoder without a digital filter
• Utilizes a discrete R2R resistor ladder DAC architecture using precision low-noise resistors
• Hybrid analog output stage combining a valve (tube)/MOSFET direct-coupled design in pure Class A without negative feedback
• Uses a pair of specially selected ECC81 tubes (recently changed to Genalex Gold Lion ECC81 from Telefunken) for the tube output section
• Galvanic and magnetic isolations between the FPGA and R2R ladder converter
• Jitter-free digital interface “AQlink” using the I2S protocol for connecting to AQUA CD transports
• Modular design with easily replaceable circuit boards for future upgrades

INPUTS AND OUPUTS:

• Digital Inputs: USB, S/PDIF (RCA, BNC), AES/EBU
• Analog Outputs: Balanced (XLR), Unbalanced (RCA)

PERFORMANCE AND SOUND QUALITY:

• Praised for exceptional sound quality, tonality, timbre reproduction, soundstage depth/width, fine detail retrieval, and ability to handle complex musical passages
• Tube output stage provides a seductive, liquid midrange without compromising speed or dynamics
• The digital filter and the R2R architecture contribute to its highly resolving and transparent sound
• Delivers a silky, elegant, and nicely transparent presentation, fantastic dynamics, regardless of source or genre

The Formula xHD Rev. 2 is considered a true reference-level DAC, offering exceptional performance and sound quality through its innovative design and meticulous engineering. It is highly regarded by reviewers and audiophiles for its ability to faithfully reproduce the emotional content and soul of the music.

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