Dolby Pro Logic (DPL) II

An improved DPL system introduced in 2000, which processes any high quality stereo signal source to replicate a Dolby Digital 5.1 sound system (i.e. five separate full frequency channels (left, centre, right, left surround and right surround) plus one low-frequency-effects (deep bass) channel).

It implements greatly enhanced steering compared to DPL, and as a result, offers an exceptionally stable sound field.