直接辐射式 meaning in Chinese

direct radiator type

General specification for electrodynamic loudspeaker of direct radiator type
直接辐射式电动扬声器通用规范
Yd100 dynamic composite - cone loudspeakers of direct radiat type with two - magnet systems
Yd100双磁路复合盆直接辐射式电动锥形扬声器
Rules for the inspection of electrodynamic cone loudspeakerof direct radiate type for export
出口直接辐射式电动锥形扬声器检验规程