Concert audio system

(57) The high-quality sound-ized method used by the sound system for generating the fundamental tone from at least one main loudspeaker 23 allotted to the summary main position, and its system 20. This high-quality sound-ized system 20 has at least one radio transmitter (30*N), time delay circuit (36*N), and two or more high 質化音 generating subsystems (32*N). Each of a sound subsystem (32*N) is a portable unit, can be moved now by those who are located in the place distant from the main loudspeaker 23, and has the inverter 60 connected with the radio receiver 48, for example, a pair of stereo headphone. A transmitter broadcasts the electrical signal equivalent to the input electric signals supplied to the main loudspeaker 23. The broadcasting signal received by the receiver 48 is restored to it and amplified, and drives a converter (60 or 62). A converter (60 or 62) generates high 質化音 in sync with the sound which reaches from the main loudspeaker 23. In order to perform this, a time delay circuit (36*N) gives predetermined delay to the electrical signal supplied to a converter (60 or 62). Time to start this delay is time to be equivalent to time for the above-mentioned fundamental tone to spread from the main loudspeaker 23 through air to those who are located in the distant position.