Much I do not want to write the many positive reviews; I can only agree with the previous speakers. The connection terminal of the boxes allows bi-amping, ie the connection of two amplifiers. At first I had my Marantz PM 7004 normally connected to the boxes, and the sound was great! When I then read the article on bi-amping in FonoForum, 7025 I bought the Marantz amplifier to MM. Now the amplifier depends on the midrange and HF drivers 7004, the power amplifiers to the bass drivers. You would not believe it; but people from FonoForum were right. Not only are the bass now much drier and clearer to hear (especially in classical music, which is not so compressed, always a little problem; in pop / rock bass are so downright "enriched"), but also the heights are clearly become better, the soundstage became wider, which is particularly noticeable in chamber music; I can now locate the instruments much better than before. The Marantz combination corresponds exactly the way the recommendations of the bi-amp specialists: 70 watts on the upper driver, 140 watts on the bass driver, which is a 1: 2 distribution. In pop music, the bass, however, are in some recordings already too powerful, but why there is the tone control on the amplifier, then the bass down just a little down. For classical music and jazz, however, the configuration is optimal! Who does not want to spend so much money for an expensive power amplifier: You can also connect an old used high-performance integrated amplifier to the bass driver. But then you have the problem that you have to adjust two amplifiers when changing the volume every time. I had the first try in 1988 with my old Pioneer A616, which worked quite well, but if you wanted to make the music louder or softer, that was always a problem. A real amplifier, ideally from the same company as the integrated amplifier, so is already the best solution.
