Officially, it's a PCI 25-31. (Although mine is tuned to 22HZ.) Having just unboxed mine and seen the "wow!" look on my son's face, I think the model should be called the "Mayhem" or "Anarchy" or even "Regression to a state of nature." My old Polk PSW-150 could vibrate the floors of my home. I'm actually anxious about what this animal will do. I can't even imagine what the 16-46 looks like.