Modular in its conception, the HS-DA1 is available in two versions: single DAC and DAC PRE. 

HS-DA1 also features an output for two headphones: the output drive is low impedance, so that any type of headphones can be managed in the best possible way. To optimally adapt to the different sensitivities of the headphones models, the gain and the output level can be chosen among X values. In addition, the user can set a different reference level for the RCA output and the headphone output, in order to normalize all levels when switching line/headphone. 

Conceived to be very compact and modular, the HS-DA1 combines remarkable operational versatility with the exclusive and original Norma sound

Norma Audio HS-DA1 Compact DAC:
Type: Compact DAC

Inputs:
5 Digital Inputs: USB, 2 x SPDIF RCA, SPDIF OPTICAL, AES-EBU (XLR)
Supported Resolution (USB & SPDIF): Up to 24 Bit / 192 KHz

Digital Processing & Features:
Oversampling Frequency Selection: 44.1 KHz, 48.0kHz, 88.2KHz, 96.0KHz, 176.4kHz, 192.0 KHz or AUTO
Per-Input Customization: Oversampling value, clock source, digital filter, phase
Clock Source: Can use local oscillator or clock from input signal
Local Clock Oscillators: Two separate oscillators for 22MHz / 24 MHz (44.1 / 48KHz families)
Oscillator Quality: High stability, low Jitter and low phase noise
DAC Chipset: Two PCM 24 Bit Digital to Analogue converters
Digital Filter: x8 (or x4) oversampling
Filter Roll-off: User selectable (Sharp & Slow)
I/V Conversion: Proprietary I-V architecture conversion

Outputs:
Analog Outputs: RCA and Balanced (XLR) output connection
Output Stage: Analogue output stage based with full discrete devices amplifier
Topology: Extreme low noise, high resolution, high speed, wide band (>2 MHz)

Power Supply:
Design: Separate power supply for Digital and Analogue Output stage
Filtering: High filtering capacity with numerous low impedance capacitors
Regulation: 15 Power supply regulators
Transformer: Toroidal transformer specially designed for audio applications