Hiya,
I worded that badly. Didn't mean to infer the original speakers are not good.
I run EV's in one of my 402's, and have tried neo speakers in my 404's, this is the way I prefer to gig them, and I keep the originals boxed. I do this, as I often use higher powered amps (A.M.P 440 , Acoustic 370 ) that could blow the originals.
Next I'm going to try 2 3015's ,or Faitalpro 15's in my 406.
I suppose my point is, the original speakers are good, but they are getting long in the tooth ,now, and more modern drivers are easily replaceable. The cabs are very forgiving in design, this way, they last longer.
Just the way I like to do it, everyone's mileage may vary !