See your requirements, in general, high-end speakers have spectral curve, if it is a subjective choice of words, one is the impedance, the number of European, 8 European used more, which is consistent with the power amplifier output impedance. Also, power.

Speaker, then the number of more, in addition to the impedance, as there are frequency divider frequency points, the range of the spectrum of the high bass speaker. Speaker of the form is also a lot of Bookshelf Speakers, cement speakers, generally with inverted phase holes, and some in the front, and some in the back.

Choose a good speaker and speaker, there is a point, that is, to listen to. The woofer, magnet of the bigger the better, the cone of the size of the bigger the better, the materials have cone damping coefficient of a certain. Note, we should see is what material do, is made of silk, or titanium film. The box body is heavy, wood should be dense, some with iron in weight. The supporting legs of the box are also important.