Martin-Logan X series can be used with a smartphone app that is OK. Much better results w Perfect Bass Kit.
The smartphone app is good for tweaking phase and level to fully integrate with mains.
In two years, the only negative is they are light and require mass atop them if they are on a compliant floor, i.e. media room above a triple garage with an unsupported ceiling. see http://www.ielogical.com/assets/Audio/SubWeight.jpg - somewhat low WAF factor
The smartphone app is good for tweaking phase and level to fully integrate with mains.
In two years, the only negative is they are light and require mass atop them if they are on a compliant floor, i.e. media room above a triple garage with an unsupported ceiling. see http://www.ielogical.com/assets/Audio/SubWeight.jpg - somewhat low WAF factor