JL makes high quality sounding subwoofers and the tone of the bass is what they really do well, the tone of the notes is addictive. slam and impact are there too.
the LS50s with no port plugs had a natural steep rolloff at 70 Hz in my room. point being that no filtering is required and there will be no directionality to a single sub.
the JL D110 will be an excellent sounding solution that pairs very well with your amp too, just connect with the high level speaker connections. the JL is superb at blending as well