Grand SlamAV & Security Leave a number
The crew

A Houston shop, not a call-center franchise

GRAND SLAM AV AND SECURITY LLC is David S Mertins’ company. The shop sits at 9597 Johns Rd, Houston, TX 77049.

Owner pulling cable at a wiring panel
Owner on the pull

Mertins still pulls cable himself

Security systems and AV are the same trade when you look at the wall: low-voltage, clean terminations, a client who wants the picture to work the first night.

David would rather walk the lot than send a closer. If you leave a number, he is the one who calls it back.

  • East Houston and the 77049 loop
  • Homes, shops, and small offices
  • No monitoring contract unless you ask for one
Property first

Angles follow the lot, not a kit diagram.

Panel you will arm

Simple keypad. Honest zones.

Same hands later

Service calls go back to the person who pulled it.

Number, then talk

Leave a phone. Thank-you on screen. We call.