If you cross over a planar with a steep enough crossover you can hit 110db plus. They use planar magnetics in arenas......They can play as loud as you need. But, you have to limit their excursion. My two way fully open baffle speaker uses 2 12 inch woofs with nothing but a coil on them, so a 6db per octave crossover at 300hz. Above it on a shelf is a small 8 inch dipole $50 planar driver that is running wide open (no crossover). It will only play 95 db in my small room before it starts to distort. If I put a cap before it, I am sure it could reach 100db......and if I did a 12 db per octave xover I could hit 105db.....etc. etc. If you run 4 of these small planars in series parallel you would have a 96db plus, 32 inch line array and it could handle way more power. If you use the big 10 inch planars from Parts Express or Radian (these things will handle a ton of power) and you run 4 of them in series parallel you could get way, way over 100db with no lower end crossover.
I will have info on my website about my speakers within a couple of weeks.....it will have pics and how to make them, etc. Less than $1500 gets you a seriously great speaker.....stay tuned.
I am sure the new PS Audio speaker is nice......HOWEVER, it uses a ton of not great xover parts.....crosses over the planar way above the midrange....and is 83.5db sensitive and will require a serious amp to play loud. My speaker is 93db sensitive, it uses a zero crossover planar all the way down to 400hz....and is fully dipole and costs you way less and will do bass into the low 30s.....However, it won’t have resale value and you have to make it yourself (very easy). I am not making my speaker to sell.....just letting you know what can be done.