The semiopen‐type Exhibition Hall with more than 3500 seats was built in the Yamaha Sportland TSUMAGOI with the area of 1 700 000 m2. Since this hall is expected to be used for indoor sports and musical performances, it was required to make designs from the point of view quite different from the traditional auditoriums. In view of the control of sound field by the electroacoustical means, therefore, new tools have been adopted such as (1) the movable proscenium loudspeaker, (2) movable sound absorbing canvas, (3) artificial reverberation adding system, (4) multichannel public address console and delay/reverberation control console, and (5) other various types of electrical and spatial reverberation adding devices. This paper describes the idea of design for the Exhibition Hall meeting the requirements of the latest popular music involving electric musical instruments and explains the details of design and acoustic characteristics of those electronic equipments.