Sal makes an excellent point about testing prospective speakers you may purchase with CD music you know and are familiar with. This applies to music or video systems as well.
If you do test the speakers, do it in the morning if you can, when the store opens. And make sure the other speakers, etc. are off nearby. Take your time, and don't be in a rush: It is your investment.
Over the years I have found that unlike the "push " encountered at the major outlets, the Bang & Olufsen sales staff I have done business with are quite good about this, and most have allowed me to even take the speakers home to test ( paid for first, of course ) just to ensure I would be satisfied completely.