Dual horn loaded design I built one these #subwoofer boxes several years ago. It's a #Decware design calle… | Subwoofer box design, Speaker design, Speaker projects
A Folded Horn Enclosure To Make The Most Out Of A Subwoofer | Hackaday
China New Design Horn Loaded Double 18 Inch Bass Subwoofer Speaker - China Professional Audio and Bass Speaker price
The dual 18-inch, fully horn-loaded XY-218HS with extremely high SPL – ideal for large venues and outdoor events - News - Pioneer DJ News