Controlled Acoustic Bass System (CABS) A Method to Achieve Uniform Sound Field Distribution at Low Frequencies in Rectangular Rooms

The sound field produced by loudspeakers at low frequencies in small- and medium-size rectangular listening rooms is highly nonuniform due to the multiple reflections and diffractions of sound on the walls and different objects in the room. A new method, called controlled acoustic bass system(CABS), is introduced. The system utilizes from loudspeakers and extra loudspeakers on the opposite wall of the room processessed to cancel our the rear-wall reflections, which effectively conveys a more uniform sound field. The system works in the time domain and presents good performance over the loudspeaker low-frequency range. CABS has been simulated and measured in two different standard listening rooms with satisfactory results.