I think you missed some of what I was saying.
My post was regarding the pickups that ship in the Double Edge guitars.
They are the Ibanez version of the
DiMarzio Blaze II / Steve's Special pickups. (7 & 6 string version, respectively)
The pickups found in the Double Edge guitars ARE NOT in any way similar to the Ibanez V8 pickups found in the other guitars you mentioned. Those pickups have much more wire wrapped around them giving them a volume and midrange boost.
In order for Ibanez to get the DiMarzio tone, they wrapped less wire around smaller magnets, resulting in scooped midrange and decreased volume. (When pickups are your business, you get tone AND volume... that's why I use DiMarzio.)
That is the primary reason for differences in sound quality (when judging the pickups alone -- cuz the mahogany body adds a lot of cut that the
basswood bodies lack) from the 2020X and the RG 5xx guitars you mentioned.
It has nothing to do with the piezo signal mixing in with the magnetics -- there's no way to get that unless you do custom wiring (or unless you bought one of the brand new ones, but then you have to select it.) And, if you did have it, it would more than likely make things LOUDER, not softer.
It's simply a matter of physics. Less wire=less volume. Less magnet=less volume. The Double Edge guitars have teeny tiny pickups compared to the ones in your other RG guitars.
I dunno how you feel about working on your stuff, but you can easily test to see what I'm saying. Take the bridge pickup out of your 570 and put it in the 2020. You'll have the volume you're missing, but (in my opinion) it won't sound anywhere near as good. Put a Steve's Special in there and you'll maintain the tone and get the volume you're looking for.
ryan