I wanted to mount my speaker in my sedan so using one of the Spartan mounts and some woodworking skills I was able to do so without having to screw anything to the car dashboard. The mounts work really well and so far the speaker hasn't bounced loose.
I mounted it under the dash of my 65 Chevy C10 so I can have tunes on the road. Lots of people commented on it at the car show.
Bought two of these mounts for golf carts. They work great! They keep the speaker from rolling or bouncing around. Would buy again!
I was going to use this for an install on a boat and was hoping the speaker wouldn't come loose with all the bouncing around. I did some testing with it and my speaker would come loose fairly easily. It was a good idea, but needs something that locks it in place to make it more secure.