I sold REL when they first came into the US. They are still a wonderful product, but one of the most Overlooked subs on the market is Paradigm.
Depending on budget, The Defiance X10 for $1k is a great value. It has Anthem Room Correction and an app that allows you to control the sub from your phone. The X Series is built in Canada and the woofer’s surround (ART - Active Ridge Technology) on the cone holds two US Patents = It increases the output +3dB (which is the equivalent output of two woofers) and cuts the distortion in half - those are the two patents. It’s incredibly musical and will pressurize your room improving the harmonics of music you listen to just like the REL does.
Pressurizing the room is something very few talk about. When you’re at a concert (in a venue/hall/auditorium i.e. an enclosed space, when the orchestra plays, or the band plays, the room becomes pressurized and this helps the harmonic detail unlike going to a concert that’s outdoors. So for avanti1960
to say that subs don’t add clarity to a system, that’s not really true. A great sub can add a lot. I would also recommend doing one sub over two lesser subs. There is not strength in numbers with this, only room for more problems. So if you're going with more than one, they need to be good, not average or just ok. Always get the better thing.
Also, the Defiance Subs have the kind of output required for home theater that the REL’s don’t. Check out the Defiance Subs on YouTube and at Paradigm.com Want to go higher end, look at the Prestige Subs by Paradigm.