What’s your technique for making a voice recording (or any sound effect for that matter) sound like it’s outside?

Here’s the tricks I use: any kind of reverb tail must obviously be removed. I roll off some of the lows and raise 2kHz to 4kHz slightly. At times one or more delay taps can help if there are reflective objects close by. This gets me close but I feel more could be done to accomplish this. Any ideas?