Stranger.things.s03.complete.1080p.nf.web-dl.dd...

The acronym "DD" in your search refers to the audio codec. For the 1080p Web-DL of Stranger Things Season 3, the standard is Dolby Digital Plus (E-AC-3) at 640 kbps.

Why does this matter for Season 3 specifically? Stranger.Things.S03.COMPLETE.1080p.NF.WEB-DL.DD...

Source (Netflix). This is the most important tag for identifying where the file came from. The acronym "DD" in your search refers to the audio codec

Absolutely. Season 3 was shot digitally using Red Helium cameras (5K and 8K resolution), then mastered and downscaled. Here is how 1080p holds up: Verdict: If you have a standard 1080p TV

Verdict: If you have a standard 1080p TV or monitor, you are getting the full intended experience. The Duffer Brothers color-graded the show on 1080p reference monitors.