I confirmed with the builder and he says that that is correct. You would have to re-terminate it with RCA connectors. Note that this is how you could make it work, but I would not recommend it. Belkin does sell the cable you need. If you have an answer to or comment on this subject, please click here to submit it.
Coax cable has a much higher capacitance than typical line level cable.
Although not the absolute best approach, you can get away with using 75 ohm coax for line level audio. First, go to the distribution block of your cable distribution system and disconnect the leads that go to the jacks at the woofer and receiver locations from the distribution amp or splitter and connect the two leads together with the double female F connector to create a direct connection between the two jacks. Next, attach coax cables of sufficient length to the wall jacks at the two locations and connect one RCA to F adapter to the free end of each. You are ready to go. The better approach would be to forget the use of the coax in the wall and use proper line level audio cable between the two components.