First off, Eldarado is correct. Thiel recommends 100 to 400 watts for the 2.4's. In the past Thiels recommendations were based on standard ratings, i.e., into 8 Ohm loads. The CS 2.4's drop down to 3 Ohms. With that in mind, ideally you should choose an amp that is capable of between 300 to 1200 watts into 3 Ohms. IMHO, 600 watts into 3 Ohms would be a good place to start. Thiel has offered that they have had best results with Ayre, Boulder, Classe', Conrad-Johnson, Krell, Levinson, Pass, Theta and VTL. They also suggest some other less ambitious offerings and that others amps that they haven't tried may work well too. Most people agree that Thiels more so than most other speakers really need quality amplification to be at their best. Most people also seem to agree that one should avoid amps that can get nasty in the upper frequencies.
