Everyone is entitled to their opinion. My living room is 20x 40 with cathedral ceiling and balcony at one end and one sub works fine...if your into Heavy Metal and what killer Bass....then get as many as you want..have a good day...
@limomangus It’s really not opinion, and it’s not at all about “Heavy Metal and want killer Bass.” Two subs do a much better job integrating with the room, dealing with room modes/nodes. allowing subs to work less hard with less distortion, etc. If you read the research from noted experts like Todd Welti and others the extensive benefits of adding more subs is very well proven and documented and is born out by the experience of many here as well where adding a second sub yielded huge improvements over just one. In addition, subs are not just about low, slamming bass, and good subs integrated properly have a huge impact on greatly improving things like better/more solid imaging and an expanded 3D soundstage. The good news is with companies like SVS, etc. you have the opportunity to try adding a second sub totally risk free and experience those benefits yourself and if not worthwhile just return it, so why not?