A method for an automatic equalization of sound pressure levels in at least one listening location, where the sound pressure is generated by a first and at least a second loudspeaker, comprising supplying an audio signal of a programmable frequency to each loudspeaker, where the audio signal supplied...http://www.google.com.au/patents/US20090086995?utm_source=gb-gplus-sharePatent US20090086995 - AUTOMATIC BASS MANAGEMENT
