Using Stereo Channels on the Si Impact
Written by Jose Liberio Cruz
Updated at January 14th, 2026
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Unlike the Si Expression and Si Performer, the Si Impact does not have ¼" line inputs. There are 4 stereo channels available on the mixer, they just are not assigned or patched by default.
How To Assign and Use Stereo Channels on Si Impact:
There are total of 8 stereo channels on Si mixers. On all Si mixers, 4 are used for F/X Returns. These are usually ST 5 to ST 8. On Expression and Performer, 2 or 4 are used for the 1/4" line inputs. Seeing the stereo channels do not have a mic preamp, they can only be used for line level sources. On the Si Impact, you can use ST 1 through ST 4 for digital inputs, such as MADI channels from the USB interface.
This is how you assign the stereo channels to faders and patch input signal to them:
- On the Main Menu select Fader Setup.
- Select an open channel (or you can change any existing channel if you like).
- Under Assign Stereo Channels, select one of the unused stereo channels. In this example, ST 1.
- Select Inputs and VCA.
- Make the patch. In this example, we are patching MADI channels 33 and 34 (USB audio return channel 1 and 2) to the stereo fader ST 1.
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