Just my thought. I have an SVS PB2000 pro. It's everything I need. Love the phone app for fine tuning and pre-sets. It's not a micro for sure. The SVS really adds an amazing amount of weight and presence. I've owned several Velyodyne and Monitor Audio subs, but this SVS is in another league. I have never heard REL or JL but know of their good reputation.
Cheers