| Situation
| Modifier
|
| Distance (indoor/outdoor)*
|
|
| Up to 5 feet/yards
| +10%
|
| Up to 25 feet/yards
| ----
|
| Up to 50 feet/yards
| -10%
|
| Up to 100 feet/yards
| -25%
|
| Up to 150 feet/yards
| -50%
|
| Up to 200 feet/yards
| -75%
|
| Up to 300 feet/yards
| -100%
|
|
|
|
| Ear Covering
|
|
| Cap
| -10%
|
| Scarf/Cloth
| -10%
|
| Hat
| -25%
|
| Leather helmet
| -50%
|
| Metal helmet
| -75%
|
|
|
|
| Sound Obstructions
|
|
| Closed door
| -50%
|
| Ear pressed to door
| -20%
|
| Bend in corridor
| -10%
|
| Curtains
| -15%
|
|
|
|
| Sound Volume
|
|
| Whisper
| -25%
|
| Personal conversation
| ----
|
| Speaking to an audience
| +10%
|
| Shouting
| +25%
|
| Yelling
| +50%
|