depends on the amount of ambient noise the pups will recieve, as well as the distance from the speakers, like nyjbkim said. i wont get any feedback from my EMGs, some from the stockers in my Schecter, and lots from the shitty stockers in my yamaha $trat. And if i stand right up next to my amp and stick the pickups in front of an active speaker, itll make it louder. also, since you seem to like that sound, and youll figure this out on your own eventually, but moving the guitar back and forth, or closer and further in front of the speaker will change the sound a bit,
enjoy