You do realize that demo shops have the sub levels set up randomly, right?
punch is basically a function of frequency response. You can tons of punch or no punch at all with the exact same sub based on how you configure it.
I invite you come to my house to see the difference between a proper setup and any other setup - all with the same sub.
lol
When I demo a setup, I make an appointment in advance. I tell them what receiver to use, what speakers, what sub, etc. I then bring in my own music, my own movies, etc.
We then spend a couple hours setting things up and go from there.
I don't just randomly walk in off the street and listen to some demo setup they have for random customers.
Would you order a car off a website based on stats alone, or would you want to test drive it, maybe even take it for a weekend before making a decision.