Redback A 4500B Operating Manual page 9

Redback® A 4500B Evacuation Controller & Timer
Setup
Step 3: Open the folder to change, in our example the "bell" folder, and you should get a window that looks like figure 2.2.
Fig 2.2
Step 4: You should see an MP3 file "Schoolbell3.mp3". This MP3 file needs to be deleted and replaced by the MP3 file
you want to play when you activate the bell.
The MP3 file name is not important only that there is one MP3 file (see Note 2) in the "bell" folder. Make sure you delete
the old MP3!
Note 1: MP3 files should have the following specifications for optimum performance.
128kbps, 44.1kHz, 32bit, VBR or CBR, Stereo (even better as mono).
Note 2: All folders except the "Prebell" and "Music" folders must have only one MP3 file installed. The "Prebell" and "Music"
folders can have unlimited MP3 files (depending on available storage).
Note that the new MP3 file cannot be "Read only". To check this, right
click on the MP3 file and scroll down and select Properties, you will get a
window that looks like figure 2.3. Make sure the "Read Only" box has no
tick in it.
Fig 2.3
Repeat these steps for the other folders.
The new MP3's are now installed on the Micro SD card, and the card can be removed from the PC following windows safe
card removal procedures. Make sure the A 4500B is OFF and insert the Micro SD card into the Micro SD card slot ; it will
click when fully inserted.
The A 4500B can now be switched back On. If all the MP3 files are OK then the unit will display the time screen. If an MP3
error message is is displayed, there is a problem with one or more of the MP3 files.
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