I was thinking about that too, whether to submerge the outlet or just barely above the water line. However, don't you get water splashing sounds instead of gurgling sounds or is yours pretty silent? Just to clarify, my gurgling sound isn't too bad. I'm sure it would be drowned out by all the other sounds (skimmer pumps, circulation pumps, etc.), but I'm trying to isolate and eliminate / reduce every single source of sound in my system.
I've gone through the DAS thread and here are some of the approaches I've seen. Maybe some of you can chime in about your experiences in trying to quiet the outlet.
1. outlet submerged below water line
2. outlet barely above water line
3. put a PVC cap on the vertical piping
4. put some vinyl tubing in the vertical piping
5. put a gate valve on outlet
Thanks.