Philips CRT TV Owner's Manual page 16

Use of the menus
16
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Select with the cursor up/down.
Sound Mode
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Enter the list of Sound modes with the cursor right.
As you select an item of the list, a graphic appears to the right, illustrating the
speakers configuration.The illustration is updated according to the chosen
speaker setup and the selected sound mode.
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Select the sound mode according to the sound signal being broadcast.
Stereo
This mode reproduces only the left and right front sound signals.
You only hear a stereo sound if the broadcast which you are receiving is
transmitted in stereo.
3 Stereo
The sound signal is now distributed over the front left, the front right and the
center TV speakers.
The rear speakers do not produce any signal.
Hall
The special sound signal is distributed over the rear speakers which creates a
hall effect from the rear.
The center speaker does not reproduce any signal.
This mode is recommended when you wish to add surround sound to a
broadcast which is not encoded Dolby Surround or to a mono signal.
3D Surround
3D Surround enables you to experience the effect of Dolby Surround Pro
Logic without the need of having rear speakers connected or activated.
Select the level of 3D Surround Effect in the Sound menu.
Pro Logic (with Dolby Surround broadcasting)
In addition to the left and right internal speakers, the center and the rear
surround speakers reproduce the Dolby Surround Pro Logic sounds.
This 4-channel sound is always present in the movie or program marked with
G Dolby Surround.
This mode is especially recommended for such programs or movies.
With two extra front speakers connected
To enhance the sound reproduction of your TV you may connect two extra
front speakers via an external amplifier. (See Connect Accessory Devices,
External speakers/Amplifier, p. 36.)
In the Sound modes, Hall and Stereo the internal TV speakers do not produce
any sound if your amplifier is turned off.
Note: If extra front speakers are connected, the external amplifier has been turned
on, and Center Mode On is selected in the Speakers menu, all internal
TV speakers produce center sound in the surround modes Pro Logic, 3 Stereo
and 3D Surround.