I am using two JL Audio e110 subs in stereo with my M106s. My room is slightly bigger than yours so I'm sure a single sub would be more than adequate in your situation. You might have to experiment a bit for the best location.
This sub is self-powered and can be fed either via RCA inputs or directly from your speaker connectors on your amp.
Best, Fred
This sub is self-powered and can be fed either via RCA inputs or directly from your speaker connectors on your amp.
Best, Fred