Rockna Audio · DACs
Wavelight PRE/DAC
An R2R DAC and preamplifier with 117 dB range and digitally controlled analog volume.
fig. 01 · dacs
Wavelight PRE/DAC
From Rockna Audio
The Wavelight PRE/DAC pairs a 25-bit R2R ladder DAC with a built-in preamplifier. It handles PCM to 384 kHz and DSD to DSD512 over USB, running on a Xilinx Spartan7 FPGA with 60-bit math precision and Parks-McClellan filters (2500 taps).
Volume control is digitally controlled but stays in the analog domain. Three gain settings per output (RCA and XLR) and a home-theater bypass make it flexible in mixed systems. Four filter modes include NOS for purists.
Specifications
| S/PDIF | 24bit 44.1-192k PCM, DSD64 |
|---|---|
| AES/EBU | 24bit 44.1-192k PCM, DSD64 |
| USB | 32bit 44.1-384k PCM, DSD64-512 |
| OPTICAL | 24bit 44.1-176k PCM, DSD64 |
| I2S (LVDS) | 32bit 44.1-384k PCM, DSD64-512 |
| THD+N: R2R/HYBRID | -0.005%/TBD |
| S/N ratio (0 dB): | 117 dB |
| Dynamic range: | 117 dB |
| Output impedance: | 50 ohms |
| Max. out (SE/XLR): | 2.4/5.8 Vrms |
| THD+N (RCA): | -113 dB |
| THD+N (XLR): | -119 dB |
| Selectable Gain (RCA): | 0/6/9.5 dB |
| Selectable Gain (XLR): | 8/14/17.5 dB |
| HT bypass | YES |
| Silicon technology: | Xilinx Spartan7 |
| Dac type: | R2R 25 bit + Hybrid mode (in development) |
| Memory-based PLL, digital domain only: | 300 fS jitter |
| Custom digital filters: | NOS, linear, minimum and hybrid phase, 8x |
| Filter type: (advanced convolution) | Parks-McClellan, 2.5K taps |
| Mathematical precision: | 60 bit |
| Stopband attenuation: | - 135 dB |
| Passband ripple: | 0,00003 dB |
| Volume control: | Digitaly controlled ANALOG |