Depending on the kind of electronic music, the tracks might not have that much content in the true sub-bass (e.g. <50 Hz). Most electronic drum hits, and even many rumbles, in my music collection are somewhere between 50 and 150 Hz in terms of fundamental (I run a real-time spectrum analyzer in my music player). So a lack of sub-bass extension might not affect bass perception that much, as a hump in the 70-150 Hz region boosts the parts of bass that matter most. And that's before psychoacoustic effects like missing fundamental can boost the perception of the sub-bass, even if the sub-bass tones aren't actually being reproduced.