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FORUM Line loudspeaker systems definitely rank in a league of their own. They are furnished with chassis of the highest grade and have been optimized for maximum performance at long throws. Among other things it is the implementation of technologies like PLANAR WAVEGUIDE (530k/PDF) (F18/F17), CONICAL WAVEGUIDE (F12/F9) and PowerMax (940k/PDF) (F5 / F8) that contribute to the FORUM Line's outstanding sonic quality. FORUM Line loudspeaker systems are available to be used in stand-alone applications. However, they are also included as system speakers in Xa and PowerMax systems