I think I'm going to give it a try anyway.
it seems the "suitable for downfiring" equations are about long-term durability, as I said whichever driver I used first would be a short term temporary solution (like 1 year, 1-2 movies a week), the hand calculated numbers for the $40 driver give 5.7% sag vs. the recommended max of 5%. given the short life span requirement, is that .7% a big deal?
I've modeled the sub using the Dayton RSS315HF-4 12" High Fidelity Subwooferhttp://www.partsexpress.com/pe/showd...number=295-464
for this woofer, PE recommends a 3.41 CuFt enclosure tuned to 21Hz.
an online minimum port diameter calculator calls for a 4.53" diameter port.
if I go with a flared port can I use a 4" port? if I use a 4" port, it only needs to be 19.5" , plus 4" flared ports are relatively cheap and easy to find.
5" or 6" ports result in much longer port lengths, requiring me to construct a U-bend in the port for it to fit.
using 16" sonotube, my tube length would be 32.22"
using 14" sonotube, my tube length would be 41.625"
is 16" visually much fatter than 14"? I would like this to be fairly unobtrusive and I'm thinking 2" wider but 10" shorter is going to be less dominating.
my floor is carpet over concrete, should I build a bottom plate like the SVS's have or just put legs on it?