The first location I stopped at was Bird's Fort Trail Park which used to have a DSA at that location, however, to my surprise it was relocated to a nearby police station further North on Riverside Dr. I was also surprised to see the park still closed from previous rains which flooded the bordering Elm Fork Trinity River and subsequently flooded the park.
DSA at old Location:
https://goo.gl/maps/Ser1u
DSA at new location:
The next location I visited was the siren on La Villita West of Riverside Dr. There used to be a EOWS 612 at this location and I remember recording it about three or four years ago on an old tape camera. It sounded for about 10 seconds and then stopped while the rest of the system continued running for the duration of the three minute test. If I manage to find the tape and convert it to a digital file, I'll definitely throw it on here.
Anyways, here is a streetview of the old 612 (which managed to capture a repair tech carrying out maintenance on it.

https://goo.gl/maps/0f9ZO
Here is the new 508.
The next location I stopped by is a 2001-130 on Longhorn Dr.
Went down the tollway a few more exits to an EOWS 612 on Carbon Rd.
This siren is up on a hill and has a good view of its surroundings, I'd imagine it gets great coverage as well.
Next I went to an EOWS 612 by Victoria Park off Northgate East of Pleasant Run Rd.
I also went to another EOWS 612 off Valley View Ln. South of HWY 183.
Lastly, I stopped by the recently installed 508 which is located between the Library and Fire/Police Training Academy off Esters Rd. South of Rochelle Rd. This siren also replaced an EOWS 612.
While I'm posting pictures I might as well include this picture of an EOWS 612 taken back in April, 2014. This siren is located on Walnut Hill and Branqus Dr.