Originally Posted by MKtheater
Happy means a member wanted the Dayton DIY performance and bought CHT subs and loves them. I have measured my CHT subs and ULF existed.
Neither of these observations have any bearing towards objectivity. Happy could very well mean they enjoy 2/3 or half of the displacement just fine. Good for them, but it doesn't add anything here. ULF "exists" on 12" pro mids- again, it doesn't really tell us anything.
Let's put this another way. We've got the Chase driver at 11.1mm geometric rated xmax vs the Dayton's 12.8mm. Like I noted, 15% advantage. Outdoors, we slowly crank excursion to find the CEA-2010 distortion limited output and find the Dayton moving further than that, say 20mm in the low end on average cleanly. Not having been tested, we don't know where the Chase is, but can it do 15% less at this point like it's geometric rating says? Maybe, so let's say 17mm here.
Now, back to the context of this thread. We take each driver inside the typical room and add gain in the ULF region. The drivers have some more freedom to run lose with distortion lowered. We no longer have a CEA-2010 standard, but what the average joe finds to be "reasonable" levels of distortion. So turn up the gain a bit and let's see where we're at.
The Chase 18 starts tapping out at 20mm, game over. You're going to have to back off to 19mm at a minimum. Now, adding +3dB to that the Dayton is at 27mm and hasn't yet reached it's physical limits!
So the Dayton in-room could very well hold a 50% advantage in ULF for users. And that's giving the Chase unit the benefit of the doubt with proper signal shaping and juice that you and I both know most users don't have.
Again, the Chase is going to have nearly an 8dB disadvantage in ULF to be overcome assuming the user even has the tools necessary, and the majority of owners with the SA1000 do not: