The top left knob (as you look at the back of the sub) lets you switch from the hi to low level connections (including 180 phase shift for both).
Other knobs allow you to modify settings so you can both (1) fine-tune how high in frequency range the REL goes so it "comes up beneath" and integrates well with your main speakers for music (hi level), and (2) increase volume for movies (low level; your preamp sets the crossover frequency, usually sending everything below 80 Hz to the sub only).
I leave mine connected both ways and simply turn the top left knob over when I watch a movie. From my reading of the manual (and it's not intuitive) this seems to be all you have to do. However, make sure your preamp is set to *only* send low frequencies to the sub during *movies*, and not also during stereo music playback, or you lose the benefits of REL's proprietary connection method (connected via your speaker outputs at the hi level). In other words, the preamp should be sending the entire signal at all frequencies to the main speakers during music playback.
At least I think. :] Enjoy.
- Paul
Other knobs allow you to modify settings so you can both (1) fine-tune how high in frequency range the REL goes so it "comes up beneath" and integrates well with your main speakers for music (hi level), and (2) increase volume for movies (low level; your preamp sets the crossover frequency, usually sending everything below 80 Hz to the sub only).
I leave mine connected both ways and simply turn the top left knob over when I watch a movie. From my reading of the manual (and it's not intuitive) this seems to be all you have to do. However, make sure your preamp is set to *only* send low frequencies to the sub during *movies*, and not also during stereo music playback, or you lose the benefits of REL's proprietary connection method (connected via your speaker outputs at the hi level). In other words, the preamp should be sending the entire signal at all frequencies to the main speakers during music playback.
At least I think. :] Enjoy.
- Paul