Sony CFD-ZW150 Operating Instructions Manual page 24

Adjusting the audio emphasis (MEGA BASS/4 BAND GRAPHIC
EQUALIZER/SURROUND) (continued)
24
Setting Up
CFD-ZW150/.ZW160/ZW200.E_3-859-373-1X.U2/CA2/AU6
Getting the surround effect (CFD-ZW160/
ZW200 only)
Press SURROUND.
The "SURROUND" indication appears in the display.
You can get the surround effect without connecting
surround speakers.