Extremely low distortion, excellent transient response, exceptionally deep frequency response, easy to use room EQ filters. I set mine up manually to my own room and taste, the sweet spot is now exceedingly linear (+/- 1db from 150hz to 17hz) no joke.
Read more I had Genelec 1034b (the big ones!) and I switched to a set of ProAc SM100, Sound Anchors, and Genelec subs... Far more linear, less distortion, far more transparent mid-range, and frequency response is far deeper too. These subs work with any monitor, and integrate with any room. Love them. Would buy again but I only need 2 and these are subs for life. Cheers, Brennan