When I used Onkyo it was a DTS setting for 2channel width on my current Anthem it's also a DTSX setting. Used to fill in a wider stereo image. When playing stereo modes.

I set my 160 to 40 or 60Hz. and it has a wonderful bold deep male dialog.

Have you felt to make sure all drivers are functioning?

I do that with my Qs10s almost weekly. They blend so well I end up thinking they're disconnected.