It is complete DIY a 15"Hawthorne Coax with a better Horndriver B&C de250
passive with Tube Amp Pushpull El 34 (97dB/1watt) and active 15" Bass
<75Hz with intern Xover Yamaha P 3500s Amp.
Easy to match with Volume Control from the Yamaha Amp....
Dimensions: 23’ × 16’ Large
Ceiling: 7’