Technical Resources
Creating a custom audio interface in win|RTA
The USBPre2 is an excellent digital audio interface and has been integrated into the D2 system as the default audio interface. But many other interfaces can be used with the D2. This article will show how to use another interface with the D2.

The device needs two balanced line inputs. Without balanced inputs, the level will be 6 dB low, plus probable increased noise level. The interface must have an ASIO driver. You will also need an RMS reading voltmeter to complete this procedure. This procedure can also be used (with some changes) with the other winRTA versions.

  1. Connect the interface and start the D2 software. Next select Config→Interfaces→Custom→ASIO or Config→Interfaces→ASIO.

  2. Select Cinema

  3. Select the driver. In this example we will create a custom interface using the USBPre2 and ASIO driver.

  4. Select Out.

  5. Go to Config→Output and verify the output level. The meter reads dBu, so select dBu in the Output Levels section, and set the level to -20.

  6. Select Sine in Test Signal Type.

  7. Connect the interface output to the voltmeter to read RMS voltage. The frequency should be 1 kHz.

  8. The meter reads -17.8 dBu, so we must enter -2.2 in the Gain (db) box (to match the -20 dBu output we previously set) and press ENTER.

  9. Now connect the output to the USBPre2 line input, and select dBu in the SPL window.

  10. Select Configure Line.

  11. Click RUN on the main RTA screen.

  12. In this case, the SPL window reads -21.0 dBu, so we enter 1.0 in the Gain window so that the reading in the SPL window matches the output setting in Config->Output.

  13. Save the interface name.

  14. Finally, switch to Config→Output, select Pink, and do a 60 second average to verify that the pink noise measurement is flat.

If you click Save Configuration, the D2 software will load with the custom interface selected. You can also select the new interface by selecting Load under Audio Interface Profile. The interface configuration will appear in the program directory with an extension of AIX.

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