SP395 SoundPro Audio Integrator
Form7492
Operation Manual
47
Multi-Band Decay
The Multi-Band Decay function computes the RT60 reverberation time for 7 octave bands
simultaneously. RT60 is defined as the time that it takes sound to decay by 60dB. Ear protection
is recommended when using this function.
The Multi-Band RT60 (MB-RT60) test measurement screen.
MB-RT60 Test Measurement Screen and Control fields:
1.
Test Function
– Identifies the current test function MB-RT60 (Multi-band RT60).
2.
Test Interval
– Selects the time duration of the test as it alternates between pink noise on
and off to perform the MB-RT60 measurement.
3.
Column Description
– Labels the columns of values below this field. Not selectable.
4.
Speaker Distance (Value) –
Use this field to enter the approximate distance that the
SP395 microphone is from the nearest speaker. The reverb decay test uses this
information to ignore any possible early sounds that are not part of the normal test,
allowing the test to provide more accurate measurements with transient noise spikes. Turn
the control knob to highlight the Speaker Distance Value field. Click on the field and turn
the control knob to set the distance in 0.1 increments from 4 ft. to 999.9 ft. or the
equivalent range in meters. Click to select the desired value.
5.
Speaker Distance (Units)
– selects the unit of measurement used to set speaker distance
either feet (ft) or meters (m). To set the speaker distance units, turn the control knob to
highlight the Speaker Distance Units field, and click to select
m
(meters) or
ft
(feet).
6.
Test Control/Mode
– increments the MB-RT60 test function through its testing steps.
Steps include: Off, Min, Max, and Run steps.
•
Off: Stops the MB-RT60 test.
•
Min
:
Sets Minimum Room Noise
–
Highlight the Test Control field and select
"Min."
The SP395 reads the average background noise level in the room during this
step. If this level is greater than 50 dB, you should attempt to decrease the ambient
noise for best test results and better room acoustics.
