Test Signals; Pink Noise; Dolby Noise; External - Extron electronics SSP 7.1 User Manual

Setup, cont'd

Test Signals

Test signals are used during setup to calibrate each channel's levels and to ensure
proper connection between the SSP 7.1's individual output channels and the line
level input channels of an audio signal processor, a receiver with built in amplifier,
or a stand alone amplifier that will power the loudspeakers.
The three options for test source are pink noise, Dolby noise, and an external
source. By default, the test signal is switched off.

Pink Noise

Pink noise is a random signal with all audio frequencies present, that is generated
by the SSP 7.1. It provides equal energy per octave to provide a flat response
over all frequencies. The main purpose of pink noise is to calibrate the speaker's
interaction with its given environment.

Dolby Noise

Dolby noise provides a bandpass-filtered noise, centered at 750 Hz with a
12 dB/octave role off. This signal is also generated by the SSP 7.1 and is used to set
speakers to the same level when calibrating the room.

External

This option requires an external calibration source, such as an audio calibration
disk that is played through a selected input source. These calibration disks are
usually used to test specific decoding mode outputs and when the External Source
option is chosen, the speakers that receive the test signal can be specified.
To calibrate speaker output, using any of these test signals with the SSP 7.1 Setup
and Control Software, see page 5-12.

Output Channel Trim settings

This control adjusts the output channel trim level for each output channel to
match the levels to the unique needs of any listening environment. The level can
be adjusted within the range from -24 dB to +12 dB. The default setting for each
speaker is 0 dB.
N When the level is set above 0 dB, the Output Volume control is reduced by an

Listening Mode settings

The SSP 7.1 provides a range of settings that refine the sound distribution for each
listening mode, depending on the decoding mode that has been selected.

Dolby Pro Logic II or IIx Music

Dimension control

This feature alters the ratio of L+R to L-R for two-channel input signals, which
adjusts the sound field towards the front or towards the back. The available
settings are front, neutral, or back. The default setting is neutral.

Center width control

Pro Logic decoding produces a single center signal that comes from the center
speaker. If there is no center speaker, a "phantom" center image is produced that is
split between the right and left speakers.
If right, left, and center speakers are present, center width control allows variable
adjustment of the center image so that is heard only from the center speaker, only
from the right and left speakers, or from all three speakers in varying degrees.
4-6 SSP 7.1 • Setup
equivalent amount to prevent the possibility of clipping.