The position of the distance between two horns and listen auditor shows triangle, of two horns turn round projectile angle to also want at least upcountry 45 degrees of above.
英
美
- 两个喇叭之间的距离与聆听者的位置呈一个正三角形,两个喇叭的向内扭转投射角度也要起码45度以上。