RDL HRDAC1 Digital to Analog Converter

Herman # RDLHRDAC1




The HR-DAC1 is the ideal choice in installations requiring high quality analog audio from an AES/EBU, AES-3ID or S/PDIF digital audio source. The HR-DAC1 automatically detects a valid input on any of the four input jacks: S/PDIF optical, S/PDIF coaxial, AES-3ID or AES/EBU. The AES/EBU input is 110 Ω terminated; the S/PDIF coaxial and AES-3ID jacks are 75 Ω terminated. A front-panel LOCK LED indicates the presence of a valid digital audio source without any phase-lock or bit errors. Sample rates from 32 kHz to 192 kHz are supported with front-panel LEDs to indicate standard digital audio rates of 44.1 kHz, 48 kHz, 96 kHz and 192 kHz. Professional operating stability is achieved with RDL's proprietary Sure-Lok™ latch-up auto recovery.

The digital input is converted to stereo audio using high speed delta-sigma conversion, digital filtering and filtered wideband analog drivers. The high performance, low-noise converters are supplemented with digitally controlled analog gating to produce unparalleled performance. The LEFT and RIGHT output levels are individually adjustable using front-panel knobs. A dual-LED VU meter displays the output level of each channel to facilitate level adjustments. Balanced +4 dBu audio outputs are provided on a rear-panel detachable terminal block and on XLR jacks. Unbalanced -10 dBV outputs are provided on phono jacks.

The HR-DAC1 is powered from 24 Vdc, which may be connected through the detachable terminal block or through the dc power jack. A front-panel power switch is provided.
  • Broadcast Quality Audio Digital to Analog Conversion
  • Input: AES/EBU, Coaxial or Optical S/PDIF, AES-3ID
  • Outputs: Balanced and Unbalanced Stereo Audio
  • Adjustable Audio Output Gain Trim
  • Dual-LED Audio Output Level VU Metering
  • Operation Up to 24 bits, 192 kHz
  • Exclusive Sure-Lok™ Auto-Recovery Sentinel
  • Transformer Isolated AES/EBU Input
  • Automatic Sample Rate Detection with Indicators
  • Digital Signal Lock Indicator for Valid Inputs

Inputs (4):

110 Ω AES/EBU XLR, transformer isolated; S/PDIF optical;
75 Ω S/PDIF coaxial phono jack; 75 Ω AES‑3ID BNC

Outputs (6):

Left and Right: 150 Ω bal. XLR and terminal block, +4 dBu; ‑10 dBV unbal phono jack

Sample Rate:

32 kHz to 192 kHz


16 to 24 bits

Frequency Response:

5 Hz to 24 kHz (+/‑ 0.2 dB into high impedance load)


< 0.002% (20 Hz to 20 KHz, below +22 dBu)

Harmonic attenuation:

2nd: ‑105 dB; 3rd: ‑108 dB; 4th, 6th: ‑115 dB;
5th, 7th: ‑110 dB; above 7th: <‑115 dB, typical


< ‑100 dB (5 Hz to 3 kHz); < ‑90 dB (3 kHz to 20 kHz)

Output Level:

Adjustable OFF to +24 dBu (0 dBFS); Left and Right

Phase L to R, R to L:

±0.15° (5 Hz to 20 kHz)

Residual Noise:

< ‑100 dB (10 to 20 kHz, ‑120 dBFS input)
< ‑100 dB (10 to 20 kHz, ‑120 dBFS input)
< ‑110 dB (locked to digital input, digital audio off)

Dynamic Range:

> 110 dB (resolution 24‑bit unweighted)

Indicators (10):

POWER LED, blue; LOCK LED, green;
RATE: 44.1 kHz, 48 kHz, 96 kHz, 192 kHz;
dual‑LED VU meters, left and right


AES3‑2003, IEC60958

Power Requirement:

24 to 33 Vdc @ 175 mA

Ambient Operating Environment:

0° C to 55° C

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