Editing Matrix decoder (section)

=== Backwards-Oriented encoder ===
{| class="wikitable"
|-
! Matrix !! Left Front !! Right Front !! Left Back !! Right Back
|-
! Left Total 
| k1.0 || 0.0 || k0.7 || 0.7
|-
! Right Total 
| 0.0 || j1.0 || -0.7 || j0.7
|}
''<math>j = +90^\circ</math> phase-shift, <math>k = -90^\circ</math> phase-shift''

The Backwards-Oriented Encoder was the reverse of the Forward-Oriented Encoder - it allowed sounds to be placed optimally in the back half of the room, but mono-compatibility was sacrificed.
When used with standard stereo recordings it created "extra wide" stereo with sounds outside the speakers.

Some encoding mixers had channel strips switchable between forward-oriented and backwards-oriented encoding.