So, dunno whether it's appropriate for this group or no (I appeal to mods to remove if not, my intentions are good), but here's a video of our church service this morning where you can hear the DJ4 and the 55-02 fretless really well. One song I used harmonics with a JHS compressor and chorus.
It's a small church with amateur technicians, so the mix isn't great and neither is the musicianship (I don't know who the cahon player is; not sure it's really his instrument...), but the bass comes through well.
DJ4:
55-02:
Signal chain is bass>Eden Glowplug>Eden WTDI.
Peace,
SoundSupport