I've experienced the jump factor on expensive and inexpensive speakers...but they all had one thing in common...very high sensitivity rates! The best jump factor I've experienced was from a pair of Legacy Whispers XD's one of the most dynamic speakers I've heard (yes, more dynamic to me than the Scanea 3.4 and the MBL 101E although these both have the jump factor ), the K-Horns, La Scalas, and Cornwalls (just about all big horns have the jump factor). Now here's the surprising thing....inexpensive speakers (under $2000 a pair - some are vintage) that have the jump factor also.... The Infinity SM-150 (102db), Snell E and E-II, the Klipsch Heresy ... this was a big surprise because it's such a small speaker but pair it with multiple subs and these things sound very close to the Whispers in the area of dynamics . My mother was visiting me and she could have sworn that a person was playing live drums in my den - my brother fell out of his seat on the Legacy Drum demo - played through my modified Heresy I's. The jump factor can also be acheived in a properly treated room and properly set up speakers - that will help ensure the right delievery.I just experienced the "jump factor" (again). Eric Clapton's excellent vinyl pressing of Live At Budokan was playing, and I got up for a minute to check on something. As I went from one room to the other, and bypassing my audio room, I heard a voice and turned around. I could swear there was someone in my apartment. Instead it was the recording. Freaky, but pleasantly so.
I also think that there is another type of jump factor - its not the dynamic - jump out of your seat, factor, but the surprise factor of a speaker. I listened to the Joseph Audio Pulsar...and almost every speaker had a hard time impressing me after that! I felt sorry for the Aerial 7T's because after listening to the Pulsars - they seemed perdestrian to me. I was looking for subwoofers in the room when Jeff Joseph just laughed and told me - "You're not going to find any...trust me". That was a jump factor of another kind for me. Sonics, dynamics, and real bass from a monitor!
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