Extron electronics SSP 200 - Speaker Delay Settings; Test Signals

SSP 200 • Speaker Setup 22
Crossover Frequency
The crossover frequency sets the boundary where the low frequency signals from
designated output channels are incorporated into bass management. Low frequency signals
are only taken from speakers that have been set to Bass Management (see Speaker
Settings on the previous page). The bass management signal is passed to the subwoofer
(if present) or speakers that have been set to Large (except for the center speaker) if a
subwoofer is not present.
The crossover frequency can be adjusted within the range of 40Hz to 250Hz, with a default
setting of 100 Hz. Speakers set to Bass Management (see Speaker Settings) output only
signals above the set frequency.
Speaker Delay Settings
There are two different signal delays that compensate for different needs (see figure38 on
page42).
Speaker distance delay — In a room where speakers are not equidistant from the listener,
sound from the closest speaker reaches the listener before sound from the farthest speaker.
This feature allows the user to enter the speaker distance value for each speaker output
channel. The application calculates the delay values for the closest speakers, up to 700ms,
so that all audio arrives at a central location (the “sweet spot”) at the same time.
Lip sync offset — Video delays occur due to changes in programming from a source (TV,
cable, satellite, or Blu-ray player) and also if the video signal has to be processed through
another device between the source and the display. The lip sync offset feature allows the
user to delay the audio sent to all output channels so that video and audio output are
synchronized.
Since each source may need a different level of compensation, the lip sync offset for each
input is independently adjustable from 0.0 to 300.0 ms. Apply lip sync offset to the audio
until what is heard matches what is seen on the display.
Configure these settings using PCS (see Layouts and Speakers on page78).
Test Signals
Test signals are used during setup to calibrate the level for each channel and to ensure
proper connection between the individual output channels of the SSP200 and the line level
input channels of an audio signal processor, a receiver with built in amplifier, or a standalone
amplifier that powers the loudspeakers.
The three options for test signal source are Pink Noise, Dolby Noise, and Active Input.
By default, the test signal is switched Off (see figure39 on page44).
Pink Noise — Pink noise is a signal generated by the SSP200 that provides equal energy
per octave to provide a flat response over all frequencies. The main purpose of pink noise is
to calibrate the interaction of a speaker with its environment.
Dolby Noise — Dolby noise provides a bandpass-filtered noise, centered at 750 Hz with
a 12 dB/octave roll off. This signal is also generated by the SSP200 and is used to set
speakers to the same level when calibrating the room.
Active Input — This option requires an external signal source, such as a signal generator,
played through the selected input source. Generally, this is a device with an analog signal
output, with the SSP200 analog input used as the active input.
Signal generators are usually used to test specific decoding mode outputs. When the
Active Input option is chosen, the speakers that receive the test signal can be specified.