You're fridge supply is too small for this. Use 3/8" tubing. There's no need to use flare fittings like gas pipe. Compression will never leak and is easier to assemble. Slide the nut on the tube, slide the Ferrell on, coat the Ferrell with pipe dope, slide the tubing into the stop until it bottoms out and tighten everything up. Use a back up wrench on the shut off valve when you tighten the nut. I would never use any hose, braided or otherwise in a wall. I believe it's against code here but I haven't had a code book out in years. The braided line would also be hell to replace if you ever had an issue down the road.
I was able to get the RSB-14 and the RW-1s working for a surround setup. It took a while with the tech support, but I got it figured out. I had a few issues. One I had was verifying my source was a Dolby 5.1, which I was able to do. Another was my home network. I had to upgrade my router to a faster one that is on the DTS Play-Fi recommended list. The DTS Play-Fi site has a lot of good troubleshooting information and explanation on how to setup your network.
The last bit that got me over the hump was that I thought I had installed the proper firmware on the RSB-14. The About in the app said I was using 4.008 firmware, but the install did not complete. I tried a few times with one flash drive, but I would get an install error. When I tried another flash drive, the installation completed successfully. I was then able to get audio from my rear channels when I made the surround group.
Been a while but I think it was a Panaflow. Just look for a 24v fan with a low dB rating. Also be sure it's an 80mm fan and you orient it correctly. Here's a small list but there are others.
Delta AUB0824L * Delta AFB0824L * Panaflo (Panasonic) FBA08A24L * Papst TYP8414L * SanyoDenki 109RO824H402
I would think the seal is the most important part, it's what I would work on if it were me.
The good part of false corners connected to the speaker is if your room shape and size put the Khorns aiming way to far in front of the listening area. False backs allow toeing the speaker to the right direction without loosing the bass.