Using Spectral Balance
Spectral Balance is used to test whether or not a sound system in a
room will meet the Spectral Balance specification. It uses the results
of other modules in AudioTools as the input data for this test.
The System Bandwidth Selector
You can choose the
system bandwidth type at any time, before or ater selecting input
files. Use Full for music systems, Limited for general purpose systems,
and Voice for voice-only systems.
When you
change the System Bandwidth, the upper and lower limits shown on the
screen will change, and the pass/fail indicator may also change.
Defining the Room and Selecting the Data Files
Tap the Settings button on the toolbar on the bottom of the main page to bring up the Settings page.
Room Dimensions
To change the name of the test,
just edit the text field on the top of the Enter the length, width, and height of the room.
Data Files
Tap the Frequencies button to select the Low or High frequencies selection.
Tap the File Selector to pick the type of the file that you wish to
use. The specification suggests that you use SPL Graph LEQ averaged
files or RTA files recorded in Average mode for the low frequencies,
and LARSA files for the high frequencies.
Tap the Select File button to choose the files that you have already
saved to assign them to the low or high frequency file slot. Make sure
you select both files.
Results
When you
return to the main screen, the data that has been retrieved from the
data files will be assembled, normalized, and displayed using a best
fit algorithm, to attempt to fit the data within the specification bars.
If the data can be placed within the bars, the graph will be marked with "Pass". If not, the graph will be marked with "Fail".
Saving and Recalling Files
To save the results of a Spectral Balance file, tap the folder icon on
the lower left side of the toolbar on the bottom of the screen. This
will being up the Save / Recall page.
Save the file by entering a file name and tapping Store File on the the popup that appears.
To recall a stored file, select it from the list to highlight it, and
then tap Recall to bring up the results. Note that recalling a stored
file replaces the information on the main page.