Originally Posted by tuxedocivic
...Akin to a ported response, which is odd. Good though!
Not odd when including room gain and an amp with some boost.
This is a single Tempest X in 3 cu ft, downfiring, at the 1/3 point of the front (long) wall, full range. Note the varying effect of the filter settings; the 16Hz setting looks a lot like mad's curve below 40Hz. It's what I use.
Also note that features like the "spike" can vary strongly with mic placement. Here's some data for my room, dual subs, after Audyssey and PEQ adjustment.
The 4 positions are a ~3' diamond around an on-axis listening location. About the space you take up with hands on hips; mic positioned at your elbow. there's a 25dB dip at 41Hz, but localized so I'd never be able to hear it with both ears at the same time. Not worth addressing in my book.
Make sure you move your mic around before you determine there's a problem to fix.
PS the Ultimax series is comparable to the Tempest X at a reasonable price. Hard to beat, sealed or vented in my book.