Bignerd100 makes a good point. Subs are very very difficult to integrate and the budget ones can ruin a refined sound, so make sure it's worth it to you. Listen first.
I know someone that would have to change the level on the sub for each LP because it was too loud on some and too soft on others.
I know someone that would have to change the level on the sub for each LP because it was too loud on some and too soft on others.