Here's a new idea:
Tinker: Hypersonic Voice Amplifier
Adds a Hypersonic Voice Amplifier to a neck slot item, enabling you to activate it, Silencing all targets in a 10 yard range for 3 secs. Can only be activated once every 5 minutes.
The engineer can only Tinker his/her own gear and Tinkering causes the targeted item to become Soulbound.
(Adds the flavor text "It's time to bring the Noise" if the item has none)
Basically, you yell so loud you rupture the eardrums of everyone close to you.