Distracting Cacophony

Evocation [sonic]
Level: Artificer * 3, Bard * 2, Sorcerer */Wizard * 3
Components: V, S
Casting Time: 1 Standard Action
Range: medium (100 ft. + 10 ft./level)
Area: 20-ft. spread
Duration: 1 round/level (D)
Saving Throw: None
Spell Resistance: yes
  The air fills with loud and discordant noise, making concentration difficult. Casting a spell in this area of cacophony requires a concentration check (DC 15 + the level of the spell being cast). Any other concentration checks in the area have their DCs increased by 5. The DC of Perception checks involving hearing is likewise increased by 5.