MPN #DAC1-MK2    
Weiss DAC1-MK2


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The Weiss DAC1-MK2 is a stereo 24 bit / 192khz D/A converter designed with the aim of keeping an absolutely uncompromised audio signal path.

Much detail and thought was spent on the digital input as well as the analogue 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.
There are three digital inputs on XLR connectors, and one on Toslink (optical). The accepted sampling frequencies are 44.1, 48, 88.2. 96, 176.4 and 192kHz. AES/EBU signals on a single connector are used. Each XLR input is actively routed to a corresponding XLR digital output, allowing monitoring at multiple stages in a digital studio setup.

Several signal reclocking schemes are combined for extremely high jitter attenuation, making the DAC1-MK2 virtually immune to jitter over a very wide bandwidth.

The correlation technique (using two converters per channel) which was already successfully employed in the ADC1 gives the DAC1-MK2 an edge over other D/A converters with equal wordlength and sampling rate specifications, resulting in improved SNR and THD.

The discrete Class A outputs have a virtually zero Ohm output impedance, but still can drive large loads without stability problems. Output levels can be set between -infinity and +27dBu. The outputs are symmetrical, but do not have any sound degrading servo mechanisms built in. For asymmetrical operation only one leg of the XLR connector (plus ground) is used.

By hooking up an analog potentiometer or fader to the remote connector, the output level can be remote controlled. This level control happens in the digital domain. The input source selection can also be remote controlled.

Frontpanel Elements
  • Four switches for input selection
  • Six LEDs for sampling frequency display (44.1 / 48 / 88.2 / 96 / 176.4 / 192)
  • Three LEDs for input wordlength display (1..16, 17..20, 21..24 bits)
  • One Emphasis LED
  • Two 25 turn trim potentiometers for fine trimming the output level

  • Backpanel Elements
  • Three digital inputs on XLR
  • One digital input on Toslink
  • Three digital outputs on XLR, buffered from XLR inputs
  • Two analog outputs (channel 1,2) on XLR
  • Output level range switch (high / low) Remote connector with the following signals:
  • Power supply to external faders
  • Tapers from two external faders
  • four input selection switches
  • four LEDs for input selection switches
  • Power:
    Mains voltage: 115 V or 230 V with voltage selector
    Fuse rating: 500 mA slow blow
    Power consumption: 80 VA max.

    Depth: 30 cm
    Width: 43,3 cm (19")
    Height: 4,4 cm (1HU)

    AES/EBU Input:
    Sampling frequencies: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz
    Maximum sampling frequency deviation: ±80 ppm
    Maximum input word-length: 24 Bits
    Channel Status Data: Input accepts professional or consumer format
    Connector: Three XLR female (110 ), one TOSLINK (optical)

    AES/EBU Output:
    Three XLR male connectors with buffered versions of the corresponding XLR input. One of the outputs can be switched such that it reflects the currently selected input to the DAC.

    Analog Output DAC1-MK2:
    Two XLR male connectors, pin 1 ground, pin 2 hot, pin 3 cold
    No servo circuit
    Not earth free
    Short circuit proof
    DC coupled
    Class A
    Output impedance: 0.2
    Output level: continuously variable between dBu and +27 dBu including a 12 dB high/low switch

    Wired Remote Control Connector:
    15 pin DSUB connector pinout:
    01 Ground
    02 Ground
    03 Key #2 (switch to ground, selects input #2)
    04 Key #4 (switch to ground, selects input #4)
    05 LED #1 (anode of LED for key #1, cathode at ground)
    06 LED #3 (anode of LED for key #3, cathode at ground)
    07 Ground
    08 +5 V supply for external fader (connect fader between +5 V and ground)
    09 Not connected
    10 Key #1 (switch to ground, selects input #1)
    11 Key #3 (switch to ground, selects input #3)
    12 LED #2 (anode of LED for key #2, cathode at ground)
    13 LED #4 (anode of LED for key #4, cathode at ground)
    14 Fader channel 1 taper
    15 Fader channel 2 taper

    Firewire/Thunderbolt interface
    USB interface with DSD to PCM conversion capability
    ST glass fiber input
    IR remote control for volume control (DAC1-MK3 only)
    Wired remote control for volume control and inout source selection

    Measurements DAC1-MK2:
    Measurements taken at the following conditions (unless otherwise noticed): +27 dBu output level, 0 dBFS input level, 44.1 kHz sampling frequency (fs), 22 kHz measurement bandwidth.

    Frequency Response:
    Fs = 44.1 kHz, DC...20 kHz: ±0.05 dB
    Fs = 48 kHz, DC...20 kHz: ±0.05 dB
    Fs = 88.2 kHz, DC...40 kHz: ±0.5 dB
    Fs = 96 kHz, DC...40 kHz: ±0.5 dB

    Dynamic Range:
    115 dB unweighted
    118 dB A-weighted

    THD+N at 1kHz:
    At 3 dBFS input: 104 dB
    At 0 dBFS input: 105 dB

    SNR at 40 dBFS input:
    114 dB unweighted, relative to full scale output
    117 dB A-weighted, relative to full scale output

    From 0 dBFS to 100 dBFS input level: less than ±1 dB deviation from ideal
    From 100 dBFS to 130 dBFS input level: less than ±1.5 dB deviation from ideal

    Less than 130 dB, DC...20 kHz
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