I’m planning to build two enclosures 9cu ft . There will be two K-145 per box with a 2420 with Mcaully 9 inches horn lens, with metal lens instead of the JBL’ plastic ones.

Id prefer two woofers at the bottom then the horn at the top because of the listening height...

il seems that 4,5 cu ft is ok For those speakers. Is it ok to double the cu ft wtith two woofers sharing the same box?

What at if I put 4- 4 inches port at 5 inches deep each port.? Bue where to put them? Between the 15 inches? Or keep the two moofers close for better coupling? They will be concealed so no way to put them in the back!

by the way they will be electronically crossed-over with a Behringer Ultradrive Pro DCX2496, a Phase Linear 700B (recapped, re-biased) for the woofers (parallel at 4 ohms) and a Crown D150A not recapped yet but they will...