and Dolby SRD.

The most elaborate mode of this codec in common use involves five channels for normal-range speakers 20 Hz - 20,000 Hz (right, center, left, right surround, left surround) and one channel (20 Hz - 120 Hz allotted audio) for the subwoofer driven low-frequency effects. Mono and stereo modes are also supported. AC-3 supports audio sample rates up to 48 kHz.