I recently just swapped a pair of Tidal Audio REF-TM12.4s (Image Dynamics ID12D4V3) for a pair of Fi X 12s with dual 2 ohm coils. My setup is more of an SQ setup. The X's blend really well when turned down but get loud if I crank them. I'm running them on an old Alpine V12 MRD-M1005 in a 2.5 cube sealed enclosure. I'm extremely happy with them and would say they're a top notch all around sub. I'd recommend these to anyone looking for a great all around sub, but Fi seemed to build them as a limited run speaker.
