This is a Beta Three DIY speaker kit for PA / Disco.
1 x Beta Three 15inch 350w RMS Bass speaker, cast frame
1 x Beta Three ED4401 Compression driver 50w RMS
1 x Beta Three crossover 2 way 300w RMS ( with active protection for HF )
1 x Beta Three Horn Flare 290 x 190 mm ABS plastic or 180 x 180 square horn
All you need is a BOX to put these parts into and you have a great speaker.