It really isn't that relative of a statement. If I took a sub, and put it in a properly built and tuned box with a goal of achieving a high spl. I know for a fact i wouldn't be picking anything from RE's lineup. in fact the only sub I might consider even remotely is the early 2000's MT and even then, it would be way way way down the list. Quite frankly when Adire went out of business is the day RE became completely irrelevant. I don't care who is makeing them now, or who is now running the company it's not the same quality product.
As for the car you mentioned, I know that car (it was done before I was brought down to Ga to work here) and you aren't proving me wrong in my statement. Quite frankly I don't want to get into any further, b/c I wasn't the employed here when it was built.
Also, who ever it was that said Sundown is a SQPL sub, you couldn't be more wrong. There is absoluyely nothing high quality or even sound quality related about Sundown. They are a lowpriced, mid level internet brand, much like a litany of other companies out there.