Xfinity modem causing noise in audio equipment

I have high-end audio equipment in the same room as my Xfinity cable modem.  Specifically, I have an Origin Effects audio compressor (guitar pedal), which is very high quality.   That compressor is approximately 3-5 feet from the cable modem (which is also a mesh router).  When I engage the compressor, I hear a pulsing sound.  I confirmed it was coming from the cable modem.  If I place aluminum foil around the compressor, the noise is substantially reduced.  No other audio equipment in the room is affected.    The pulsing sound seems to be from the mesh router sending out a signal looking for satellite routers.

I bridge the cable modem into Eero mesh routers.  If I disable the Eero and connect directly to the Xfinity cable modem, the pulsing noise persists.  So the pulsing noise is not from the Eero device.

I do not use the Xfinity cable modem's mesh router capability.  How can I disable the Xfinity modem's mesh routing capability?