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Test Tone Generator
The SP4 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, the SP4 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.
3. Noise Selection
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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.
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".
6. RTA
When a USB microphone (such as the optional
Theater Acoustic Diagnostic Kit) is connected
to the SP4, you can use the Real Time Analyzer
to visualize the response of loudspeaker
groups in the room. Note that the built in RTA
is not accurate enough to use for calibration,
but is useful for getting a good idea of the
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