What is the maximum frequency limit for the matrixed back channel in Dolby Surround?

The maximum frequency limit for the matrixed back channel in Dolby Surround is 7,000 Hz. This frequency limit is established to ensure the effective transmission of audio signals that are most relevant for rear-channel sound effects and ambience in a surround sound system. Frequencies above this limit do not carry as much spatial directionality, which means that they are not as critical for creating an immersive sound experience in a typical home theater setup.

By capping the frequency at 7,000 Hz, Dolby Surround optimizes the audio experience by focusing on the frequency range that enhances the sound stage without overwhelming the system bandwidth. It also accounts for the capabilities of various playback systems to reproduce these sounds accurately, which can help in maintaining the integrity of the overall audio output.