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— In-Game Description
Sergei's Subwoofer is a shotgun featured in Battlefield Heroes for the National Army and was introduced with the Aliens update on March 5th, 2013. The weapon is statistically and functionally identical as Steve's Sonic Boom for the Royal Army.
Unlike other shotguns, the Sonic Boom emits a wave of sonic energy once fired. This results in a sound wave that pushes back and damages enemy players.