INT202 | INT203


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INT202 | INT203



You may own your favorite D/A Converter already. It may be not the latest and greatest, but you like its sound and its looks and features. So you don’t like the idea to get another DAC just to be able to connect the computer. This is where our interfaces come in (also see the INT204 interface described elsewhere). They allow to connect any DAC to any computer. And this in a decent way, with the computer slaved to the internally generated clock and with absolute bit transparency.
The INT202/INT203 interfaces are two variants with slightly varying features. Common to both units is that they handle all standard sampling frequencies between 44.1 and 192 kHz.


The INT202 is a stereo Firewire to AES/EBU (unidirectional) interface with infrared remote control for volume and absolute polarity. It supports dual wire data transfer in 176.4/192 kHz mode for older D/A Converters. The bit transparency of the player software on the computer can be checked with the INT202.
The INT203 is for bidirectional interfacing between AES/EBU and Firewire and also includes an infrared remote control for volume and absolute polarity. The bit transparency of the player software on the computer can be checked. The INT203 can serve as an input to the computer, e.g. to connect an A/D Converter for transferring vinyl records.


“It’s easy to install, easy to use and very easy to like. (…) An essential component if you want PC audio to sound its best.”

Nicholas Bedworth on



Both units come in a silver anodized aluminum frame.


Power Supply
Power can either be fed via the Firewire bus power or alternatively via an external power supply. A power supply is supplied with the unit. If the external power supply is connected, power is automatically taken form that power supply and not from Firewire bus power.


The sampling frequency is generated with an internal generator in the INT202/INT203. This makes sure the transfer between computer and D/A Converter is low jitter. The INT203 in addition can be switched to external synchronization via its XLR or RCA AES/EBU inputs. Both units work at all standard sampling frequencies between 44.1 and 192 kHz.


Digital Input
Two Firewire 400 connectors are used to connect the computer. The second socket can be used to daisy-chain other devices on the Firewire bus. It is not possible to connect two computers to the two sockets simultaneously.
The INT203 in addition has an XLR and an RCA connector as inputs.
Note, a Thunderbolt equipped computer can be easily connected with the help of Apple’s® Thunderbolt to Firewire adapter.


Digital Outputs
For the INT203 there are one XLR socket and one RCA socket for outputting an AES/EBU signal. The INT202 has two pairs of XLR/RCA sockets, allowing to output AES/EBU in the dual wire format. If the dual wire format is selected it is enabled if the sampling frequency is 176.4 or 192 kHz. All other frequencies stay in single wire format.


Front panel controls
There are two switches on the front panel, one for power on/off and another one for switching the transparency checking mode on/off. Then there is the IR receiver, a power on indication LED, the power input socket and two Firewire 400 sockets.


Remote Control
The INT202/INT203 units come with an optional IR remote control. This remote allows to control the volume and the absolute polarity of the signal passing from the computer to the D/A Converter. The signal fed into the INT203 to be recorded on the computer is not affected by the remote control.


Back panel elements from left to right
The back panels differ between the INT202 and INT203 units: The INT202 has two RCA output sockets, one single wire/dual wire mode selection switch and two XLR output sockets.
The INT203 has one RCA output socket, one RCA input socket, a switch to select either the RCA or the XLR input as the sync source, one XLR output socket and finally one XLR inout socket. Note, both RCA and XLR inputs are active, this allows to record four channels via the INT203 and not just two.


Software features
Both INT202 and INT203 support bit transparency checking, i.e. by playing specific audio files on the computer (files are supplied on the driver CD) it is possible to test the playback software for bit transparency. This is a check to make sure the bits read from the computer’s hard-disk reach the D/A Converter absolutely unchanged. In addition there is a digital level control with a proper dithering algorithm applied. Plus an absolute polarity inversion feature. The INT203 in addition has a special level control mode in that if there is no Firewire signal connected to the INT203, it feeds the input signal at the RCA or XLR sockets via a level control to the XLR and RCA output sockets. So the INT203 can be used as a simple remote controllable level control between any two digital audio devices.






Either from Firewire bus power or from an external power supply at 8…12 V

Depth: 10,5 cm
  • Width: 10,5 cm
  • Height: 4,4 cm
  • Height with feet: 4,7 cm


Size Remote

  • Depth: 2,1 cm
  • Width: 4,5 cm
  • Height: 16,6 cm


Available Color


Digital Inputs

  • (2) Firewire 400 connectors (also serve as output with the INT203)
  • (1) RCA connector (INT203 only)
  • (1) XLR connector (INT203 only)


Digital Outputs

  • (2) RCA connectors (INT203 only one)
  • (2) XLR connectors (INT203 only one)
  • Word-length up to 24 Bits



  • Sampling frequency is generated internally
INT203: Synchronization can be supplied via the RCA or XLR inputs
  • Supported sampling frequencies: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz

DSP algorithms

  • Volume control
  • Absolute polarity control
  • Bit transparency checking



Ultimate CAS Interface

In addition the audio volume / absolute phases can be controlled in the digital domain via an infrared remote control unit. With the volume control feature it can also replace a preamplifier. The INT202 is the ideal bridge between traditional audio system with latest computer as source on files playback.

The internal circuit design of INT202 shows swiss made Weiss quality level. The firewire connection uses internal master clocks which located extremely close to the firewire DICE circuit and AES/EBU output connectors. This ensures the highest precision timing and work as the master clock for computer as source system.



This video shows the Weiss INT202 latest version TRSP (Bit Transparency Check) function. When the TRSP Check is ON, it checks the computer firewire playback bit pattern with our supplied WAV files. If the data is bit transparent, the LED is flashing. When the firewire playback is not transparent, it stops flashing (for example in this video 00:11-00:15, the iTunes volume is not at maximum)


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