I am late to this Thread... But.. I was always told and read the REL is tops for a music system only, due to the way it blends and plays with two speakers. Now mind you this is Audio only. Not HT. This makes me want to buy the REL sub for my system. Currently I am running a single SVS sub when required. It was not the easiest to blend either.. I do run a ported Outlaw in my HT set up and its wonderful. It was not so good for my audio system.