New RT Audio Design Orpheus Hi-Res USB DAC


"The Hi-res USB dac Orpheus is PCM 24bit/192kHz audiophile product, based on Burr -Brown flagship audio DAC with current differential output. Our company has chosen this chip for our new project after multiple auditions together with Bulgarian audiophiles. Passive I/V converter is implemented for best sound. The advantages of the passive I/V conversion are low THD, low phase shift, and low output noises. There are no active components in output section. The passive I/V conversion is realized with high precision resistor and step-up transformer with ratio 1:4, connected in differential mode without common ground point."

"We use Sowter 4383 or Lundahl LL1674 transformers. The transformer plays a simultaneously role od amplifier and LPF, with very low phase shift and very wide frequency range. For best sound we use battery power supply with Li-Ion rechargeable batteries. All passive components (resistors, capacitors) are high quality with low manufacture tolerance. We also use ultra low noise LDO stabilisers from Linear Technology (Analog device). The USB section uses new Xmos separate modul with new firmware. This dac is available in SE and EX modification.This DAC module perfectly plays jazz, rock and vocals with incredible timbral fidelity."

Technical data

- Frequency range: 10Hz-70kHz
- Phase shift: < 2%
- THD+N: 0.0004%
- Dynamic Range: 132dB
- Resolution: 24bit/192kHz PCM
- Output level: 2.1Vpp
- Digital inputs: USB 2 Hi- res : SPDIF HI- res(AES/EBU in SE and EX version)
- Analog outputs: RCA(XLR in SE and EX version)
- Dimentions: 220 mm x 50 mm x 180 mm