Sony HT-IV300 Operating Instructions Manual page 26

For fixed angle speaker intallation
The screw should protrude 6mm to 8 mm
6 mm to 8 mm
Hook on the rear of the front and surround
speakers
5 mm
10 mm
Hook on the rear of the center speaker
5 mm
10 mm
26
GB
For multi angle speaker installation
The screw should protrude 4 mm to 5 mm
4 mm to 5 mm
Horizontal speaker installation
5 mm
5 mm
10 mm
Vertical speaker installation
or