Arrangement for active sound damping

摘要

To increase the loudspeaker durability of loudspeakers (12) which are used for active sound suppression in exhaust installations, it is specified according to the invention that the loudspeaker (12) be set into the partition (18) of a double chamber box (17) and the sound exit opening (20) of this box (17) be connected via a bass reflex tube (21) to the exhaust pipe (10). Penetration of the exhaust gases into the bass reflex tube (21) is excluded if both tubes (10, 21) in the immediate opening region (22) and, respectively, the flow direction PA of the exhaust gases in the exhaust pipe (10) and the flow direction PL of the oscillating air column in the base reflex tube (21) enclose an angle between 0 and 90 DEG . <IMAGE>