Internal ported band pass enclosure for sound cancellation

Lightweight acoustic damping treatment

Lined-duct acoustic filter

Method and apparatus for actively influencing the intake...

Method and system for attenuating noise from a cabinet...

Method and system for attenuating noise from a cabinet...

Muffler

Noise reducing apparatus

Noise reducing apparatus

Protective anc loudspeaker membrane

Silencer arrangement for combustion engines

Silencer device for exhausts of motors and similar, with acousti

Single cavity automobile muffler

Sound absorbing device

Sound attenuation apparatus

Speaker retention assembly for an active noise control system

System for cancelling sound waves

Tuned Helmholtz resonator using cavity forcing