Recording application set to record at low sample rate and/or bitrate.
Check the application settings and ensure the sample rate is at least 44.1 kHz and the bit-depth is at least 16-bit (or the bitrate is 192 kbps or higher if recording to a glossy format).
Immersive mode is enabled but the application does not allow selection of discrete mic signals.
(instead the application sums the received channels to mono/stereo, causing artefacts such as comb filtering due to the processing applied to the different output channels within the SSL Connex unit).