I asked Roy what two 18 inch woofers in this horn would sound like. He said it sounds good but it will not go as deep as the single 18 with the ports.
The first prototype had a drone but there were some problems with it and this caused Roy to use the ports instead of the drone. The k-472 is an 8 ohm driver and there were some issues with amps clipping because of the 93 volts. He then switched to the k-473 which is 4 ohms and around 60 volts, this solved the amp clipping aggravation.
Edited by kharmondds, 13 April 2014 - 12:20 PM.