The top image is my 1.2-3 ft^3 towers with one RS180 woofer (with matching tweeter, although still tweaking the crossover) and I seem to be down 10-20dB in the low end and I'm not sure why. I know my room isn't optimal. It's 11*12 with a large desk in the center of one wall with the speakers a foot out from the side walls but beside the desk (1.5 feet beside the desk).
The bottom image is the same exact setup, except with a 100Hz 12dB boost. I'm not sure of the Q on the filter, because it's from my Realtek soundcard (which measures +/- 0.5 db from 1-16k Hz).
Modeling the driver in this box, ported with the same 1.5 port 2-2.5 in. long looks to be flat to below 40 Hz, and sealed the F3 is below 80. is the port that too small for the woofer, doesn't seem to be a problem with the boost? Is the room just sucking all the <200Hz out? is there port reflection from the desk perhaps? There is only 2.5dB BSC, but with the speakers almost up against the wall, that doesn't seem to be it and with the 9.5 in. baffle width the BSC F3 would be above 500. Measuring with the port plugged, and I didn't seem to lose any low end? Is the port too low? I didn't figure that would be a/the problem but maybe? The mic (RatShack) is level with the woofer, and the port is roughly 9 inches below the woofer, but above the desk level by an inch or two.
I'm at loss as to what it could be, should I take close-mic measurements? should I measure outside without the BSC filter?
Sorry for the seemingly dumb post, but I'm stumped. I don't think I'd use a sub if I could get these flat to ~40-50 Hz. -_- *sigh*