I don't think a cheap sub can ruin a good system as long as it is left off, maybe OK for movies. For music you will need to look for a sub that is both tight & tuneful maybe like Velodyne or Polk Audio which are not extremely expensive.
You are correct about bass being non directional as my neigbor & I spoke some time ago & he is still looking for that jerk who is playing the bass too loud. I just didn't have the heart to tell him that it was me. But I did tell him I would keep an eye/ear out.
You are correct about bass being non directional as my neigbor & I spoke some time ago & he is still looking for that jerk who is playing the bass too loud. I just didn't have the heart to tell him that it was me. But I did tell him I would keep an eye/ear out.