Editing Matrix decoder (section)

== Dolby Pro Logic II matrix (5:2:5) ==
{{Main|Dolby Pro Logic II}}
{| class="wikitable"
|-
! Matrix !! Left !! Right !! Center !! Rear Left !! Rear Right
|-
! Left Total
| <math>1</math> || <math>0</math> || <math>\sqrt{\frac{1}{2}}</math> || <math>j\frac\sqrt{3}{2}</math> || <math>j\frac{1}{2}</math>
|-
! Right Total
| <math>0</math> || <math>1</math> || <math>\sqrt{\frac{1}{2}}</math> || <math>k\frac{1}{2}</math> || <math>k\frac\sqrt{3}{2}</math>
|}
''<math>j = +90^\circ</math> phase-shift, <math>k = -90^\circ</math> phase-shift''

The Pro Logic II matrix provides for stereo full frequency back channels. 
Normally a sub-woofer channel is driven by simply filtering and redirecting the existing bass frequencies of the original stereo track.