A few weeks ago I bought a pair of these. They say they work with CD players on the box. I tried putting them on my bookshelf stereo. There was a loud humming noise in the subwoffer. I decided to try them on my portable CD player there was still a loud noise in the subwoffer. I e-mailed Yamaha to find out if my speakers were defective. My response was that the subwoffer level has to be turned way down when playing my music. Yamaha is still a great company, but for the better products you need to spend more money. I would not recomend these speakers to anyone who likes bass. You wont find it here.