HD25
The HD25 is a compact DAC with a built-in preamp and remote control, used to connect computers, tablets, streamers and TV sources to an existing audio system. It suits listeners who want to feed active speakers, headphone amplifiers or an amplifier from digital sources.
- 4 digital inputs: USB, 2 x coaxial, 1 x optical
- XLR balanced and RCA unbalanced line outputs
- 32 bit/192 kHz multilevel sigma-delta DAC
- Built-in preamp and remote control
- Two selectable digital filters
- All inputs galvanically isolated
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The HD25 converts digital audio from four inputs (one USB soundcard, two coaxial and one optical S/PDIF) into analog signals on balanced XLR and unbalanced RCA line outputs. A built-in preamp and a remote control allow it to drive active loudspeakers or a headphone amplifier directly. Inputs can also be switched by tapping the front panel.
The design uses technology taken from the maker's Reference line, including silicon-germanium transistors for low noise, a choice of two digital filters, impedance-matched inputs and galvanic isolation on all inputs. The DAC is a 32-bit/192 kHz multilevel sigma-delta type, and power comes from a built-in toroidal transformer with 30,000 μF capacitors.
USB works as plug and play for standard use. For 24/192 material over USB, a switch on the rear panel is set and a high-resolution driver is installed; the other inputs handle this resolution without extra drivers. The unit is listed in the maker's discontinued range.
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Specifications
- Brand
- Hegel
- Model
- HD25
- Category
- Hi-fi and home audio › Other hi-fi
Inputs
- Digital inputs
- 1 x USB soundcard, 2 x coaxial and 1 x optical S/PDIF
- Input matching
- All inputs impedance matched
- Input isolation
- All inputs galvanically isolated
- USB high-resolution mode
- 24/192 via rear panel switch and high-resolution driver
Outputs
- Line outputs
- 1 pair of RCA unbalanced, 1 pair of XLR balanced
- 0dBFS signal output
- 2,5 V RMS
- Output impedance
- 22 ohms unbalanced and 44 ohm balanced
Audio
- DAC resolution
- 32 bit/192 kHz multilevel sigma-delta DAC
- Frequency response
- 0 Hz to 50 KHz
- Phase response
- Linear Phase Analogue filter
- Noise floor
- Typically -145 dB
- Distortion
- Typical 0,0006%
- Digital filters
- 2 selectable
- Transistors
- Silicon-germanium
Connectivity
- USB driver
- Plug & Play; high-resolution driver for 24/192
- Remote control
- Included functionality, built-in preamp control
Power
- Power supply
- Built-in torodial transformer, 30,000 μF capacitors
Physical
- Dimensions (H x W x D)
- 6 cm x 21 cm x 26 cm
- Weight
- 3,5 kg
- Dimensions US (H x W x D)
- 2.35" x 8.3" x 10.24"
- Weight US
- 7 lbs