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The PowerDAC-RX is a discrete power multi-bit DA converter without -any- amplifiers or buffer circuits in the signal path

  • Custom DAPI receiver offers high source immunity
  • Toslink input
  • Bit-perfect tester built-in
  • Optional IR remote control
  • Local volume control keys integrated in display, press left/right
  • Connect to (pre)amplifiers using RCA
  • Connect to headphones with optional RCA to 3.5mm Headphones adapter cable
  • Firmware upgradable
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Vendor: EC Designs



Vendor: EC Designs



Universal DAC with integrated lossless volume control and discrete multibit fractal-7 matrix DA converter primarily intended for driving power amps.

This device comes with a built-in power supply that works with both 115V and 230V. It uses a 2-way Euro 8 mains socket. It features a 192/24 Toslink DAPI receiver with a low jitter master clock and an integrated bit-perfect tester for optimal music reproduction quality.

There's an integrated lossless 25-step volume control (1.5dB/step) ranging from 25mV to 1.7V rms. No lossy analog circuits or components are present in the signal path. You can control the volume using the local keys on the 7-segment LED display or an optional rechargeable IR remote control.

For headphones (32 Ohms and up), you can connect them using an RCA to 3.5mm jack socket adapter cable. The device comes in a durable anodized aluminum housing. For more details and specifications, refer to the User Guide, which you can download.

“New” digital audio interface

This new digital audio interface is backward compatible with the Toslink interface and S/PDIF protocol. It effectively eliminates unwanted jitter in the digital audio source, interlink, and all DAC circuits, even in the presence of significant crosstalk.

The interface ensures low noise and low jitter, improving the sound quality of existing Toslink DACs. The transmitter side (digital audio source) connects to a coaxial cable through an RCA connector. At the cable's end, there's an optical connector compatible with the Toslink input on the DAC. This setup combines an electrical interface (low jitter) and an optical interface (low noise, eliminates ground loops).


The DAPI controller has 4 S/PDIF inputs, but using all of them introduces unwanted noise. The PowerDAC aims for minimal noise and distortion without amplifiers in the signal path. Originally, we wanted to use all inputs, but this would allow up to 4 S/PDIF sources simultaneously, causing noise. To resolve this, we suggest an external switch with 4 S/PDIF inputs and remote control for active input selection.

When using the PowerDAC i.c.w. an external (pre)amplifier performance is degraded as any active device in the audio path will degrade performance !

piCore Player

For a straightforward music player with PowerDAC-BX, try piCorePlayer. Run it on an RPI4, connect music via USB or NAS. Use JustBoom Digi HAT or HifiBerry Digi(+) HAT with a Toslink cable for PowerDAC-BX. It supports various sample rates.

Ensure Audio Volume Control is fixed at 100%, Audio Crossfade is No, and Volume gain is None. Install "Material Skin" in LMS for a user-friendly interface accessible from any PC in your network through a browser.

Enjoy Deezer and Tidal, and use plugins for Spotify and Qobuz.

technical specifications
DAC type
4 x 20 bit Fractal-7 matrix, discrete, switch & resistor-based multi-bit power converters
Digital input
1 x Toslink 16/24 bit: 44.1 kHz / 48 kHz / 88.2 kHz / 96 kHz / 176.4 kHz / 192 kHz
Power Supply
Programmable internal linear power supply. Standard 230V (option: 115V)
Power Consumption
Approx. 2 Watts
Output impedance
50 Ohms regardless of volume setting
Volume control
Volume is controlled by a combination of supply voltage programming (1.5dB steps) and bit shifting (6dB steps). This way we can realise lossless volume control with no extra components in the signal path and with 36dB range. This integrated volume control enables us to directly drive headphones and power amps / buffers without the need for an always lossy pre amp or attenuator.
Output voltage
28 mV rms … 1.77 V rms Output voltage. Output can be fixed to 1.77 V rms with jumper setting
2 x RCA output, headphones can be connected through optional RCA to jack adapter cable RCA35.
LED indicator
Volume 0 … 24, - = stand-by, P = bit perfect test passed.
Theoretically 100 MHz (based on switching speed)
< 0.001% (0dB)
1.77 V ms
DAPI firmware update
The DAPI firmware can be updated using the USB socket and jumper setting positions for firmware update.
Width: 30cm, Height: 5cm, depth: 23cm
1.5 kg

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