In an attempt to have my subwoofer reviews be more objective I decided to make time -- you know how that goes -- to learn how my XTZ Room Analyzer II Pro functions. I've read the manual twice now, so I have at least a passing familiarity with all the features (which turned out to be more then I had anticipated). My first set of measurements have been taken, so I wanted to get some feedback from those who know about measured testing to see if these numbers appear legit. I already have an opinion formulated, now I need to see if the neophytes measurements -- that would be me -- are corroborated by people who know what they're doing. I tested two different subwoofers, the Simply Sound Audio Rumba 12 I just recently reviewed, and another sub I'm currently reviewing. The former is acoustic suspension with a front-firing 12" driver, while the latter is an 8" driver with an 8" passive radiator. That one has the driver and PR on opposite sides of the cabinet. For both subs I pointed the mic directly at the center of the driver, exactly 1 meter away. They were at least 1.5 feet from the nearest wall. The room is carpeted. I disabled the PEQ on the Rumba, so no boost or cut was used. The PR was not mic'ed for this test. The XTZ software has a meter which denotes clipping so all tests were run up to clipping, then the gain was turned down to just below that point. You only have preconfigured tones you can send out, so the possibilities aren't endless, which is why you'll see gaps between the frequencies. I started at the lowest -- 10Hz -- and stopped at 125Hz, even though I could have gone to 250Hz. 125Hz seemed like a reasonable ceiling to me though, so I'll probably stick to that in the future as well. I haven't figured out how (if?) to save the graphs in JPG or PNG format yet, so unfortunately there are no pictures to show. That should cover all the background info, so without further ado... Simply Sound Audio Rumba 12 10Hz - 86dB 12.5Hz - 91dB 16Hz - 97dB 20Hz - 98dB 25Hz - 106dB 31.5Hz - 109dB 40Hz - 110dB 50Hz - 107dB 63Hz - 114dB 80Hz - 116dB 100Hz - 109dB 125Hz - 105dB The sub I won't identify just yet 10Hz - 57dB 12.5Hz - 60dB 16Hz - 67dB 20Hz - 77dB 25Hz - 89dB 31.5Hz - 98dB 40Hz - 101dB 50Hz - 94dB 63Hz - 103dB 80Hz - 107dB 100Hz - 107dB 125Hz - 103dB The Rumba 12's numbers look like what it sounded like to my ears, so I'm pretty content with that one. The unidentified sub looks about right too, except for that bizarre dip around 50Hz (which I tested 3 times, just to make sure I wasn't losing it), so I image it's probably pretty accurate as well. But that's a novice talking, now I'd appreciate hearing from those who know what they're doing. Do these numbers look as though they could be legit to you? I realize without having actually heard the subs yourself you can't make a definite assessment, but in general how do they fair? I want to see if I'm doing this properly, or if I need to go back to the drawing board.