I think Firecom did use other brands for speakers before they rebranded Wheelocks because i found a few examples of a old Firecom system with other brand speakers like Atlas sound and Federal Signal
Heres a old install with Atlas sound speakers
This is another old firecom install but uses federal signal speakers instead
(you can find it on the lower levels of the 3d tour where its not been renovated near the bathrooms)
They also use EST-270-SPO and Rebranded Firecom Mirtone Pulls on old installs before
