I have not heard the HD408, but I have owned the AD700 for a while. The AD700 has less bass than the Philips SHL 5605 (Cityscape Downtown), which I guess are the most bass-heavy can that I own. The AD700 has a little less bass than the Ortofon O-One. The AD700 has more bass than the Fostex T50RP. You can hear the opening organ note of Also Sprach Zarathustra (32.7Hz, according to the liner notes of the CD Mercury Living Stereo I have just listened to) with them. The AD700 has musical and powerful bass, but it is not resonant, and this, I think, leads people to believe that they do not have much bass. In reality, their bass is excellent for the kind of music I prefer (classical, West African, jazz, blues, including electric blues), but I suspect they would not be the best choice for the kind of electronic music you mention.
Edited by MarcoGV - 8/30/12 at 8:05pm