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Weiss Medus DAC

$32,770.00 inc. GST


The MEDUS has its origins in our product line for professional mastering studios. Mastering Engineers have the Golden Ears to give the music recordings the final touch before their release. So the MEDUS is as transparent as it can be. Hands down the best Digital to Analog Converter money can buy.

MEDUS is a stereo 24 Bit/192 kHz Digital to Analog Converter designed with the aim of keeping an absolutely uncompromising audio signal path. Much detail and thought was spent on the digital input as well as the analog output stage. Both have in common the purest possible approach in audio design, aspiring for nothing less than excellence. This is coupled with an ergonomic design that gives the user immediate access to all necessary functions, while keeping an uncluttered and thus easy-to-use front panel. This combination makes a truly professional D/A converter catering for the highest expectations.

The MEDUS works with AES/EBU, S/DIF, USB and Firewire (optional) inputs and handles PCM as well as DSD signals. An IR remote unit controls all functions.

The MEDUS employs a twin metal frame. The inner chassis is made of steel and acts as a very effective shield against electrostatic and electromagnetic radiation. The outer frame is made of massive anodized aluminium for additional shielding, resulting in optimal heat convection and beautiful looks.


Power Supply
A powerful non-switching power supply is used. All sensitive voltages have their own regulators which are separated between left and right channels. The result is an analog output free of “digital noise” and channel crosstalk. The power switch activates a semiconductor relay which only switches on or off at zero crossings of the mains voltage. This assures a glitch free power switching. The mains transformer sits in a mu-metal shielding box.


The MEDUS is synchronized by the input signal present at the selected input. Several signal re-clocking schemes are combined for extremely high jitter attenuation down to subsonic frequencies, making the MEDUS virtually immune to jitter. With the USB or Firewire inputs the master clock is generated by the MEDUS.


Digital Inputs

There are a total of four inputs with the following input sockets:


  • Input #1: AES/EBU on XLR or RCA
  • Input #2: AES/EBU on XLR or RCA
  • Input #3: AES/EBU on XLR or USB
  • Input #4: AES/EBU on TOSLINK or RCA


Sampling frequencies can be 44.1, 48, 88.2, 96, 176.4 or 192 kHz. Inputs #1 and #2 can be used for the dual wire scheme of transferring 88.2 kHz…192 kHz data. All inputs accept up to 24 Bits of data word-length. Optional inputs are Firewire or ST type glass fiber.

Signals at 44.1 or 48 kHz sampling frequency are up-sampled in the MEDUS’ DSP chip, using our own up-sampling algorithms. Thus the DAC chip always receives signals at a 88.2 kHz minimum sampling frequency.


The 32 Bit DAC chip up-samples the input signal to about 1.5 MHz. Four D/A conversion channels are used per audio channel, resulting in exceptional performance specifications. The I/V conversion after the DAC chip uses two of our own discrete OP-AMPs (the OP1-BP) per channel.

Analog Outputs
All analog processing is done with our own discrete operational amplifier modules, the Weiss OP1-BP. The OP1-BP is arguably the best audio operational amplifier currently available. Four OP1-BP are used per channel, two for current to voltage (I/V) conversion and two for the balanced and unbalanced output stages. The OP1-BP run in class A mode for all common loads. Output levels can be set with a rotary switch at the back of the unit. The level range is 32 dB with a 1 dB step resolution. The outputs are symmetrical on XLR connectors and asymmetrical on RCA connectors. No sound degrading servo mechanisms or AC coupling capacitors are used.

Front panel controls

The power switch allows to switch on or off the MEDUS unit. Four switches select one out of four input sources. A display conveys information on the selected input, the sampling frequency, the output level, the oversampling filter type, the absolute output polarity, the mute status and the coarse output level setting


Remote Control
Allows to control all functions of the MEDUS, namely: The input selected for conversion, the output level, output muting, the coarse output level, the absolute polarity, the oversampling filter type, the display brightness.

Back panel elements from left to right

  • Analog outputs on XLR and RCA connectors with output level switch.
  • Digital inputs 1…4 (three XLR, three RCA, one USB and one TOSLINK connector).
  • Mains connector with fuses and voltage selector.


Optional back-panel elements

  • Firewire connector.
  • ST type glass fiber connector.


  • Mains volt­age: 100…120 / 200…240 Volt
    Fuse rat­ing: 500 mA slow blow
  • Power con­sump­tion: 80 VA max.
  • Power con­sump­tion in standby: 2 VA max.



  • Depth: 30 cm
  • Width: 45 cm
  • Height: 6,6 cm
  • Height with feet: 7,4 cm


Size Remote

  • Depth: 2,5 cm
  • Width: 6,2 cm
  • Height: 16,9 cm


Avail­able Color

Sil­ver, Black

Dig­i­tal Inputs

  • (3) XLR con­nec­tors
  • (1) TOSLINK con­nec­tor (optical)
  • (3) RCA connectors
  • (1) USB connector
  • All in­puts ac­cept pro­fes­sional or con­sumer stan­dard, i.e. ac­cept AES/EBU or S/PDIF signals
  • Sam­pling fre­quen­cies; sin­gle wire scheme: 44.1kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz or 192 kHz on any of the four inputs
  • Sam­pling fre­quen­cies; dual wire scheme: 88.2 kHz, 96 kHz, 176.4 kHz or 192 kHz on in­puts 1 and 2
  • DS­D64: On USB input
  • Sam­pling fre­quency tol­er­ance: ±80 ppm
  • Max­i­mum in­put word-length: 24 Bits


Ana­log Outputs

  • (2) XLR Connectors
  • (2) RCA Connectors
  • Servo-less, DC cou­pled, short cir­cuit proof out­put circuitry
  • Out­put im­ped­ance: < 100 Ω
  • Out­put level: vari­able from −4.0 dBu to +27.0 dBu bal­anced on XLR con­nec­tors (−10.0 dBu to +21.0 dBu un­bal­anced on RCA con­nec­tors) with 0 dBFS in­put, in 1 dB steps (−4 dBu is 0.49 V, +27 dBu is 17.35 V, −10 dBu is 0.245 V, +21 dBu is 8.67 V)
  • Out­put stage: Dis­crete Class A


D/A Con­verter chip

  • Over-sam­pling multi-bit sigma-delta converter
  • Four con­vert­ers per au­dio channel



  • Syn­chro­nized via the in­put signal
  • Ex­tremely ef­fi­cient Jit­ter at­ten­u­a­tion down to sub­sonic frequencies
  • Sam­pling fre­quen­cies: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz


DSP algorithms

Up-sam­pling, jit­ter reduction



The mea­sure­ments be­low have been taken at the fol­low­ing con­di­tions (un­less noted oth­er­wise): 1 kHz, +24.0 dBu out­put level (−3 dBFS in­put level), 192 kHz sam­pling fre­quency (fs).


Fre­quency Response:

  • Fs = 44.1 kHz: 0 Hz…20 kHz: within ±0.25 dB
  • Fs = 48 kHz: 0 Hz…20 kHz: within ±0.25 dB
  • Fs = 88.2 kHz: 0 Hz…30 kHz: within ±0.75 dB
  • Fs = 96 kHz: 0 Hz…30 kHz: within ±0.75 dB
  • Fs = 176.4 kHz: 0 Hz…40 kHz: within ±0.75 dB
  • Fs = 192 kHz: 0 Hz…40 kHz: within ±0.75 dB


Sig­nal To Noise Ra­tio (SNR) at −40 dBFS input:

  • > 129 dB un-weighted
    (rel­a­tive to full scale output)
  • > 132 dB A-weighted
    (rel­a­tive to full scale output)



  • At 0 to −100 dBFs in­put level:
    < ±0.05 dB de­vi­a­tion from ideal
  • At −100 to −120 dBFs in­put level:
    < ±0.2 dB de­vi­a­tion from ideal


To­tal Har­monic Dis­tor­tion plus Noise (THD+N) ratio:

  • < −112 dB @ −3 dBFS input
    (0 dBFS = +27.0 dBu)
  • < −115 dB @ 0 dBFS input
    (0 dBFS = +27.0 dBu)


< −110 dB, 0.20 kHz

Additional Information