The Speaker is an enemy faced in Carltron's Lair as part of the final boss battle.
The player must destroy the Speakers and the Fans to advance to the next stage of the battle. They have no damaging attack, but can blast sound and wind at the player to drive them back across the room, potentially into the path of Bombs. Otherwise they are defenseless and the player should have no trouble destroying them.
The player gets no rewards for destroying the speakers.