Room Size
Sheep,
You'd think a 12x14 room would allow 30Hz but get this:
I got an SPL meter and did some bass extension tests on my buddy's Micras: My SPL meter told me it was down -6dB at 30Hz from what it can output at 35 or 40. (But my SPL meter also starts to roll off below 35). He's got his in a corner, surrounded by two walls, the entertainment center and the side of the loveseat. 30Hz was loud and clear. One dimension of his listening aea is almost 20'. On a side note, there really is no comparison between the micra's sats and the DefTechs, but then again, that's probably why they are in two different price ranges.
My ProSub60 measures the same -6dB at 30Hz... but I can't hear it! I called DefTech, and they told me that sub should be flat to 35Hz and audible below 30Hz if properly placed. They also suggested room size was a problem. I was told if I had a sub that could do 20Hz, I'd still need 40' in one dimension to hear it. My current placement has a few peaks and dips in the 40-80Hz range, so I think there's a bad null around 30.
DefTech pointed out I could upgrade my entire system to the ProCinema 80 for less than I could purchase the ProSub 80. I went back to Magnolia and compared the ProSub 60 and the ProSub 80 in their listening studio. That room is probably a good 20x30, and sure enough, the ProSub 60 pumped out 30Hz loud and stong all the way across the room! FYI, the bigger Prosub 80 was only slightly deeper but had much worse port chuffing than the 60. Subs aside, the 60 and the 80 sets have totally different sats and centers, and oddly enough, I liked the sound of the 60s more than the 80s: The 60s are brighter and my tastes go that way.
Thanks for your advice!