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%
|