Some "worse than typo" moments from the previous post, paragraphs 4 and 5 should have been (changed words in all CAPS):
The engineers at RE suggested tuning to about 28 Hz with a port area of about 80 square inches to avoid CHUFFING. When we talked about getting full output at 16 Hz, they flat out told me to go with dual sealed subs and avoid the noise, or else build a 30 cubic foot cabinet with about 140 square inches of port area.
In our own line up, even though the big vented "VS-18.1" was 6 dB MORE powerful in the CEA-2010 burst (at 20 Hz) than the dual driver 18 inch sealed SS-18.2, in long term output at 20 Hz they were equal, with the dual driver extending nicely to 10 Hz and the overall output and slam dusting the vented.
