Any speaker gets loud, if you want high fidelity sound then a speaker with
a
lower dB/W will usually be the better sounding one, all other factors
being
equal,

Explain.

also you will find the lower SPL speaker will work better than the
higher one in a smaller box,

May. But that's the result of the smaller box moreso than the driver
itself.

obviously you do not beleive me and I don't give a hoot, but you may
believe
JL, they have or certainley used to have a good explanation as to why on
their website.

This newsgroup frequently requires that people who make assertions back them
up with evidence if anyone is to believe what they say. I wouldn't expect
anyone to believe what I say if I don't provide evidence, nor should they.
You've always backed up what you've said in the past (unlike certain other
people). So don't take Paul's rebuttal as an attack.

Question how come the better quality subs have lower spl/w than the el
cheapo versions, ie JL, Infinity ZR- Apline, DLS, Kicker vs Pine lower
cost
Kenwood Pioneer, Jet Sound etc....

This isn't always true. I can think of several that don't.