Outside of using subscriber units, a handful of the dispatches in the area sound subpar on scanners and/or DSD.
Hamburg PD on DSD and a scanner; their dispatch sounds terrible. Using an NXDN radio, it sounds crystal clear.
A handful of dispatches on SaiaNet sound eh on my 436; however, they sound fine on DSD, and I'd imagine on subscriber units, it sounds fine too.
Systems are designed for subscriber units, not scanners, not SDRs. So everyone's mileage will vary on the audio quality. That is not to say they are using the "best mic" (I have no idea if they are or aren't), or someone is talking far away from it because it's "in the way", but it's not designed for "us".