Sony STR-GX9O0ES Operating Instructions Manual page 35

Wall Material Simulation (WALL TYPE)
When sound is reflected off a wall made of soft material,
such as wood or a wall covered with a curtain, the high
frequency elements are reduced. A hard wall is highly
reflective and does not significantly affect the frequency
response of the reflected sound.
The WALL TYPE parameter controls the level of high
frequencies to simulate the wall material. The S indicator on
the display signifies a soft wall. The H indicator signifies a
hard wall. The middle point designates a standard wall
made of wood.
Soft Walk-~
Level
Early reflections
Reverberation
Frequency
Low High
Hard Wall
| Early reflections and reverberation
ance
Frequency
>
Low , High
Seat Position Simulation (SEAT F/L, L/R)
If you sit in the front of a room, you hear more direct sound
from the front speakers. As you move to the rear, the
reflected sound from the front speakers increases. Similarly,
the reflected sound changes if you move from left to right,
and vice versa. The F/R and L/R parameters control the
balance of the direct and reflected sound and other elements
of sound to simulate your listening position.
When adjusting the F/R parameter, the F indicator on the
display signifies the front position of the room. The R
indicator signifies the rear position, the middle point of the
indicator designates the center position. When adjusting the
L/R parameter, the L indicator signifies the left position of
the room. The R indicator signifies the right position. The
middle point of the indicator designates the center position.
HALL and STADIUM modes