Milimetr - the GH generate a very credible mid-bass and bass for its size - I am sure that by now you have already noticed that they sound 'larger" than it size, and its sonic portrait is far away from its radiation point, creating a very credible scenario.
I have lived with them as they are (no sub) for almost 7 months now, and currently trying a subwoofer (REL stentor) in my midsize room (4.5 x 6.5 x 3.0) mts with mixed feelings about it.
Depending on your tastes of music genres, I anticipate that you will not feel the need to augmentate its bass reproduction, they are that good!.
Hope this helps.
I have lived with them as they are (no sub) for almost 7 months now, and currently trying a subwoofer (REL stentor) in my midsize room (4.5 x 6.5 x 3.0) mts with mixed feelings about it.
Depending on your tastes of music genres, I anticipate that you will not feel the need to augmentate its bass reproduction, they are that good!.
Hope this helps.