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- Μηνύματα
- 2.343
- Reaction score
- 3.652
DAVE (Digital to Analogue Veritas in Extremis) is Chord Electronics' most advanced DAC to date. It features a digital preamplifier and a headphone amp - and it goes on sale this autumn for £7995.
DAVE WTA Filtering
* Dave has 164,000 tap WTA filter for the first stage alone (8x more than Hugo and almost thousand times more than a standard DAC)
* The WTA algorithm was subjectively optimised and improved to suit the longer tap lengths
* WTA filtering is now up to 256 FS – no other DAC has ever FIR filtered at such a high rate
* Dave has massively parallel processing with 166 DSP cores just for the WTA filtering alone
* Further advanced filtering to 2048 FS
* This means Dave much more accurately retrieves the original continuous analogue un-sampled signal (improved time domain, improved transient timing accuracy...Hugo's biggest strength gets an improvement)
Dave Noise Shaper
* The noise shaper takes the high resolution 2048 FS data and converts to 5 bits
* It also creates the 20 element Pulse Array outputs, so is the heart of the DAC
* It employs 17th order noise shaping, with total of 46 integrators – the design of the noise shaper alone would not fit into Hugo’s FPGA.
Analog Stage
* Unique 2nd order analogue noise shaper for output stage – this gives ultra high HF linearity and no increase in distortion with difficult loads
* Still employs single global feedback path with equivalent of simple 2 resistors and two polypropylene capacitors in direct signal path
* Headphone drive 6v and 0.5A RMS OP capability
Measurements
* Maximum output voltage 6v RMS – the reference voltage dBA, measured using APx 555
* THD and noise at 5v RMS 1kHz -124 dBA A wt
* THD and noise at 2.5v RMS 1kHz - 127 dBA A wt (-124 dBA into 33 ohms)
* THD 1kHz 2.5v RMS 0.000015%
* Dynamic Range at -60 dBFS 1kHz -127 dBA A wt
* No measurable noise floor modulation, no anharmonic distortion
* Analogue distortion characteristic – no distortion for small signals
* Blue 2.5v RMS, red no signal zero noise floor modulation. Noise floor at -178 dBA, distortion peaks -150 dBA, no anharmonic distortion