MPN #DAC2    
Weiss DAC2


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The Weiss DAC2 is a high performance stereo Firewire based digital to analog and digital to digital converter for usage either standalone or in conjunction with a PC or MAC.

The DAC2 is based on the renowned DICE Firewire chip of the TC Applied Technologies company on the digital side and on the equally well received Burr Brown D/A converter chips on the analog side. The combination leads to a flexible and very good sounding D/A Converter.

As a high performance stereo, Firewire based, digital to analog and digital to digital converter, the DAC2 can be used either standalone or in conjunction with a PC or MAC computer. It allows for various format conversions like Firewire to analog, AES/EBU to analog, Firewire to AES/EBU, AES/EBU to Firewire. In addition it offers a digital insert point between the Firewire input and the analog output. The analog output level can be controlled via the front panel keys.

The DAC2 supports the following conversions:
  • Firewire to analog
  • AES/EBU to analog
  • Firewire to AES/EBU
  • AES/EBU to Firewire
  • Inputs
    There are three digital inputs on XLR, RCA and TOSLINK (optical) connectors. In addition a computer can be connected via a Firewire interface. The accepted sampling frequencies are 44.1, 48, 88.2, 96, 176.4 and 192 kHz. AES/EBU signals in single wire or dual wire formats can be used. Digital outputs on XLR and RCA connectors are used to convert Firewire to AES/EBU and also for the insert point feature described below.

    The DICE Firewire interface chip in the DAC2 uses a dual PLL scheme for clock (re-)generation. This yields a very high jitter suppression down to subsonic frequencies.

    Output, level control
    The DAC2 uses THAT line driver chips with low output impedance and excellent distortion figures. Separate driver chips are employed for the XLR and the RCA outputs. The output level can be set in the analog domain in four coarse steps to accommodate for the subsequent amplifier. Fine tuning of the level can be done via the digital level control which is operated via the front panel keys.

    Front panel controls
    The front panel shows a power key, three keys for the input selection and four LEDs for sampling frequency display. The front panel keys have several functions: The selecting of the input source, the enabling or disabling of the "insert mode", which allows to insert a digital device in the signal chain between Firewire input and analog output and finally the setting of the output level in the digital domain with "up/down" controls.

    Back panel elements
    On the back panel there are three digital inputs (XLR, RCA, TOSLINK) and two Firewire sockets. Then there are two digital outputs (XLR, RCA) two pairs of analog outputs on XLR and RCA. The screwdriver operated rotary switch allows to set the analog output level in four coarse steps.

    Internal jumper settings
    Internal to the DAC2 there is a jumper to select the dual wire mode for 176.4 or 192 kHz signals.
    Bit transparency check
    The DAC2 allows to check the player software running on the computer for Bit transparency. This is done by playing a test audio file on the computer. The DAC2 then checks whether it receives the special Bit pattern from the test file. This check is running in the background of the DAC2 software, i.e. as soon as the DAC2 detects such Bit patterns it flashes three of the LEDs on the front panel.

    Optional interfaces
    Options for the DAC2 include an USB/DSD interface which allows to play back DSD files via the DAC2. A ST type glass fiber input is another option. For connecting the DAC2 to Thunderbolt there is a Thunderbolt to Firewire adapter available from Apple at low cost.
    Mains voltage: 115 V or 230 V with voltage selector
    Fuse rating: 250 mA at 115 V, 500 mA at 230 V, slow blow
    Power consumption: 7 VA max.
    Power consumption in stand-by mode:
    3 VA max.

    Depth: 30 cm
    Width: 18,8 cm
    Height: 6,6 cm (1.5HU)

    AES/EBU Input:
    Sampling frequencies: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz
    Maximum input word-length: 24 Bits
    Channel Status Data: Input accepts professional or consumer format
    Connector: One XLR female (110 ), one RCA (75 ), one TOSLINK (optical)

    AES/EBU Output:
    One XLR male connector
    One RCA connector

    Firewire Input/Output:
    Two Firewire 400 sockets to allow for daisy-chaining of Firewire units

    Balanced Analog Output
    Two XLR male connectors, pin 1 ground, pin 2 hot, pin 3 cold
    Servo circuit, i.e. pin 3 can be grounded for asymmetrical outputs
    Not earth free
    Short circuit proof
    DC coupled
    Output impedance: 50

    Output level selectable via a rotary switch at the back:
    +17 dBu (5.48 Vrms) with a 0 dBFS sine wave input
    +11 dBu (2.74 Vrms) with a 0 dBFS sine wave input
    +7.2 dBu (1.78 Vrms) with a 0 dBFS sine wave input
    +4.8 dBu (1.35 Vrms) with a 0 dBFS sine wave input

    Single Ended Analog Output:
    Two RCA connectors
    Short circuit proof
    DC coupled
    Output impedance: 50

    Output level selectable via a rotary switch at the back:
    +17 dBu (5.48 Vrms) with a 0 dBFS sine wave input
    +11 dBu (2.74 Vrms) with a 0 dBFS sine wave input
    +7.2 dBu (1.78 Vrms) with a 0 dBFS sine wave input
    +4.8 dBu (1.35 Vrms) with a 0 dBFS sine wave input

    Thunderbolt interface via the Apple Thunderbolt adapter
    USB interface with DSD to PCM conversion capability
    ST glass fiber input

    Firewire drivers for Windows? and OSX? operating systems are supplied

    Measurements taken at the following conditions (unless otherwise noticed): +17 dBu output level, 0 dBFS input level, 48 kHz sampling frequency (fs), 22 kHz measurement bandwidth.

    Frequency Response:
    DC...20 kHz: ±0.3 dB

    THD+N at 1 kHz:
    At 3 dBFS input: 97 dB

    SNR at 20 dBFS input:
    107dB unweighted, relative to full scale output

    From 0 dBFS to 120 dBFS input level: less than ±1 dB deviation from ideal

    Less than 110 dB, DC...20 kHz

    Inter-channel phase response:
    Less than ±0.5°, DC...20 kHz
    Toronto, ON
    December 22, 2020
    The best DA I've ever used
    I can't tell you how much time I've saved mixing and mastering my songs through the Weiss. The bass is really tight and defined on the Weiss unit, and the mids are clear and defined, without sounding sterile or hard sounding. The highs are nice and soft, never clinical. Read more
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