Finally brought home a pair of LS50 wireless to compare to my passives. The wireless are really solid and sound very good, I didn't mess with the streaming app because I just hooked them up with Analog outs from my processor. Right away I could tell they sounded very similar to my passive LS50 with a bit of EQ in the highs to smooth them out. If anyone recalls, I was trying to get someone to buy the ethernet to 3.5mm connector to loop back through REW and measure the signal. Well I bought one and tried to measure the ethernet to the left speaker and I just got gibberish, I'm guessing it's a digital signal and needs to be converted to analog. Either way, I still made some detailed in room measurements so I still got some good information on the differences.
Both were measured identically with a 2nd order high pass at 100hz, spatially averaged with 6 locations, 3 in front and 3 in the back of my couch around the main listening position. The LS50W were set to stand and wall mode with no bass or treble boosts.
Many people have speculated that the main difference in the actives is the bass boost but at least in the more neutral settings, there doesn't appear to be a lot of boost, just a bit from 55-80Hz. It looks like the wall mode actually reduces the region from 300Hz and below so in free space it would be a bit more. The bigger difference is in the highs, it looks like there is some EQ to smooth out the highs at 2.2k and 5k. This is why some people complain about the LS50 passives being a bit bright and that the actives are smoother in the highs.
The more interesting thing to me was comparing my passives with the EQ I've been using from in-room measurements to the wireless version. The highs are pretty much identical after 2k, I also have a filter around 750Hz where measurements show they have a bit of a peak there as well, kind of interesting that the wireless doesn't seem to do anything around that area because after A/Bing that difference vocals sound a bit nasally without the EQ.
I can see how convenient the wireless could be for someone who doesn't want amps and receivers in their room but in my opinion if you have the ability to EQ and integrate a sub or 2, you're not giving anything up with the passives. These do put out an impressive amount of bass compared to the passives but they really sound much better high passing them to some subs anyway. Hopefully this helps someone who's trying to decide on the passives or wireless version.