Test Tone Generator - Focal ASTRAL 16 Manual De Uso

ASTRAL 16
U s e r m a n u a l
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Test Tone Generator

Astral 16 includes a highly configurable test tone
generator which can be used to help manually
calibrate channels.
1. Generator
Click this button to turn on the tone generator. It
will automatically start with Group 1. The channels
outputting sound will be highlighted in green.
2. Setup
Unlike traditional generators, Astral 16 will not
strictly play tones one channel at a time. Click
Setup to assign channels to groups. Each group
may contain one or more channels. For example,
if you have 2-way active loudspeakers, you
may wish to group the high frequency and low
frequency component of each into one group.
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3. Noise Selection
Choose the type of noise or tone created by the
generator.
• Sine: Generates a sine wave at the frequency
specified.
• Pink Noise: Generates full bandwidth pink
noise
• Pink Noise 400-4kHz: Generates pink noise
band limited to one decade. This is particularly
useful when setting relative levels between
channels with dramatically different useful
bandwidths. Remember SPL meters measure
not only sound pressure but also bandwidth.
• External: it is possible to use an external
noise generator connected to one of Astral
16 defined input. This is usually required
when using an external room calibration tool
providing its own stimuli (Room EQ Wizard is
one of them, see "REW integration").
4. Gain
The gain figure can be set so that the noise
generator operates at a level at or below that of
a normal source playing at 0dBFS. Default is 0.1
(-20dBFS).
5. Group
When the noise generator is active, use this
function to play the noise through different
groups defined in "2. Setup".
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