Thanks guys for having me at your forum, where headphones are the main theme.
I am posting this because I am looking for advice. We are very close to release a headphone DAC and we would like to know your opinion - whether or not we thought of everything that people might need.
I am the designer of this beast and I can still add or modify things before formal release.
Your input much appreciated.
The basic features are:
Fully balanced lampizator DAC integrated with tube output stage.
We want to beat the normal DAC connected to a headphone amp - even a good one - by means of internal integration.
Tube power supply with a big dual diode and a big choke.
Transformer coupled output
Capacitor-less signal path
Pure single ended triodes in tube stage (no phase splitting) working in differential mode.
Ability to connect and use up to 3 headphones at the same time (for sharing music with friends)
Output to the loudspeaker amplifier (to use the device like a normal DAC) : balanced as well as SE, independent from volume control.
Manual volume control with stepped resistive attenuator for the headphone output.
Wide range of impedance from 600 down to 4 Ohms
10X volume headroom for outstanding dynamics
Total integration of the DAC resulting in an incredible clarity and realism
Inputs: USB, SPDIF/RCA.
Outputs: 2 x small jack, 1 x large jack, amplifier XLR, amplifier RCA.
(do we need headphone XLR as well ??)
We want to be able to use DAC chip directly coupled to the good triode with just an inch of silver wire, no caps, no resistors - nothing in between. We want to combine DAC output I/V conversion, analog filtering, balanced to SE conversion, signal amplification and impedance matching - all these features in one tube circuit. There will be just three parts in total: Chip - triodes and transformer.