Big fun. The TLDR is, the Monitor SE Atom measures like a bigger, bassier, smoother Atom V7. It should be fun to listen to. Also, keep the grills off your Mini Monitors and Atom V7s, but it's not as big a deal on the Monitor SE.
Size comparison, Atom V7 far left, Monitor SE Atom center, Mini Monitor V6 right:
Same order, showing grill construction:
All the testing was done with the UMIK-1 (with calibration file) at tweeter height and one meter away, as close as I could measure it. The speaker stand and mic stand weren't moved at all. Gating was set to 3.0ms, with a calculated first reflection at 3.15ms. Everything was run 3 times, then averaged. The individual runs were all very close to the average, no outliers to be had. Any spikes or valleys were present in all measurements for that speaker/grill configuration.
Here's a wild west graph, all speakers with grills both on and off, 1/12 octave smoothing applied:
No surprise, the bigger Monitor SE Atom and Mini Monitor V6 roll off the bass a bit less sharply. Overall, the big surprise for me was how much the grills affect the Mini Monitor v6. They do have that heavy plastic honeycomb, and it really makes a big impact with a giant valley at 5khz and another around 11khz, as well as generally dampening response from 1khz all the way to 6khz or so. A closer look, without smoothing:
The grills really kill the Mini Monitor V6. Who knew?
Moving on, The Atom V7 vs the Monitor SE Atom, grills off, 1/2 octave smoothing applied (green trace is Atom V7, the lower trace starting from the left):
Don't pay too much attention to the slope under 300hz or so, it's not very accurate due to gating. The general takeaway in those frequencies is 'Monitor SE Atom goes a bit deeper, but they're both still bookshelf speakers.' Above that, both speakers have a little hump centered on 800hz, more pronounced on the SE. I'll guess female voices will sound more forward on the Monitor SE Atom compared to the Atom V7. As with (I suspect) all Paradigm speakers, frequencies from 4khz and up are on the high side of spec, rising well above the claimed ±2dB from 86 Hz - 22 kHz for Atom V7 and ±3dB from 55 Hz - 21 kHz for the Monitor SE Atom as we get closer to 20khz.
The last graph I thought was interesting enough to show was the Monitor SE Atom with grill on vs off (orange trace is with the grill):
Nothing else was changed, just the grill put on. Unlike the Mini Monitor V6, there's definitely going to be room for difference of opinion on grill on vs off for this thing. The hump at 800hz is even more pronounced with the grill on. Everything from about 400hz up to 3300hz or so sees a small bump with the grill on. Then, from 4khz on up to almost 9khz, it's reversed, with the grill dampening things pretty significantly. The curve crosses a few more times above this, but my old ears probably won't be able to tell much difference. I can say there will surely be people who prefer the more forward midrange and subdued treble the grill provides overall, and some who prefer it the other way.
OK I lied. One more graph. All three speakers, grills off, no smoothing:
The Mini Monitor V6 has the bass, the Atom Monitor V7 has the mids and highs, and the Monitor SE Atom combines them. I do wish I had a set of Mini Monitor V7 to test, I suspect they'd measure close to the Monitor SE Atom.
I haven't listened critically yet, but listening to the many sweeps I ran, I think the Monitor SE Atom is going to be a winner. It has the bass of the Mini Monitor (both have noticeably more than the Atom V7) plus smoother treble, and a much better grill. Tomorrow, I'll play some music :P