A:AnswerThese brackets screw into a quarter inch threaded hole in the back of the speaker. Most speakers have them it is fairly universal so check the specs of your speaker.
A:AnswerThe size of the screw that goes into the speaker is a quarter inch. So on the back of your speaker you need to have a quarter inch threaded keyhole. Most speakers have them they are pretty universal.
A:AnswerYes they will fit. On each side of the pro center 1000 is a quarter inch screw hole which fits directly into the quarter inch thread on the bracket
A:AnswerThis mounting bracket is designed to attach to drywall with either hollow-wall anchor bolts or to a wall stud with wood screws. I am doubtful that this would screw into a pre-wired wall plate. It is possible that it would, but is not designed for that type of installation.
A:AnswerThe previous answer is INCORRECT. According to the SVS Prime Satellite product manual, the threaded insert is 1/4-20 thread. These mounts should work for the SVS speakers.