The sub has provided a whole new dimension to the sound experience. It fills in the entire low end of the sound spectrum. It is like the entire low end now flows across the bottom half of my living room where before there was just a void. Note, all my other speakers are on top of bookcases or mounted near the ceiling - so I may have exacerbated this void. Despite this, performance of the sub has been outstanding to this listener.
Original version has tight power bass.
There are two versions of this sub. I did my homework before purchasing and found out that there are two versions of this sub just like the LW-15. It appears that some manufacturers feel that it is OK to produce multiple revisions of the same model without modifying the model number. I find the practice very annoying as the two S115PS versions have significant differences much like the two LW-15 versions. I hope others will comment on this practice in their reviews so that manufacturers will see that we, the consumer, do not like the practice, and that it ultimately costs the manufacturer due to returns generated by customers unhappy that the revised versions do not live up to the original product specs.