After being told that this siren was tested on a different day by everyone that I spoke with in Summerville and two failed attempts, I was finally able to record one of their Sentry 16V1T-Bs. This siren is located about 100-200 feet behind the Summerville, GA fire department, and there is another Sentry 16V1T-B behind the Summerville Recreation Center. The two sirens in Summerville are tested on the third Wednesday of the month around noon and sounds a short alert, however they tested at 12:05 PM today. This siren was installed on 6/8/15 by Sirens for Cities and is sounding really healthy.
https://www.youtube.com/watch?v=ol3LxGbYRRw