The REL could be: Out of phase with the main speakers so together they are cancelling the sub … A REL will take advantage of the physical room acoustics to provide deep pressurization as no traditional subwoofer can. Knowledge, patience, and an open mind paid off in big dividends. For best […] The placement and set up suggestions we have for this type of system are the same for how to set up a subwoofer with a set of powered speakers. This system included a pair of Sonus faber Venere 3.0 floorstanders, the Venere Center and a pair of Venere Walls along with the REL T-9 for a complete 5.1-channel set up. The high-level connection ensures the sub receives exactly the same signal that is being sent to the front left and right speakers. While the crawl can work for basic subwoofer setup, use of a microphone and a software measurement program in place of your ears will provide even better results. The REL S/510 is easy to set up and, in terms of the connections, you have a choice of using the high-level or low-level inputs, including a mono LFE channel. Working with a partner, one in the listening position and one at the REL manipulating position and controls is the most effective an efficient way to set up. I set up the sub to sound best on 95% of my music, and use Shiit Loki tone controls to adjust the remaining 5%. This track is perfect for the set-up process and should be played at the highest reasonable level expected for system playback. Ideally, you would need to tune the sub to sound its best for every single song, which is of course impractical. Try to keep the sub on the same wall and ideally the same plane as your main speakers and then experiment with the level. This is a sad reality, which you only can accept and live with. I evaluated the REL T-9 concurrently with my recent review of the Sonus faber Venere 3.0 surround system. Conclusion While the REL 212/SE performs very well with music, especially with mighty crescendos, it really comes into its own with home theatre work. If you are finding that you need to set the Crossover control to be above 20 clicks, then your main speakers may not be making very much low bass. Initial set up only took a couple hours followed by a few tweaks over the next couple of weeks. A good subwoofer should disappear into the room, integrating with your music and movies instead of sticking out and being overly powerful. Typically for most speakers the best crossover point to set will be around 80hz. With these, it is seemingly without volume limit. Setup of the REL T-9 Subwoofer. At some point in the manual REL says this subwoofer is designed to Chinese orchestral drum, or indeed an 1812 Overture cannon, it roared. A REL is designed to augment the performance of FULL RANGE speaker systems in order to provide, in certain cases, linear response below 15Hz. August 29, 2012: This is an update of my subwoofer setup article from 2008. Or there is likely problem with your setup. REL products are not traditional subwoofers, but true Sub-Bass Systems. Merely buying a great subwoofer is no guarantee that you'll wind up with great bass.