Bowing wheels in general
The sound of the Ekdahl FAR can be just as much a product of the choice of bowing wheel as it is the choice of the string. Both the shape and the material of the wheel plays a big role in shaping the sound, certain wheels "inject" their own sound into the mix while others generally only emphasize those occurring in the string. Wheels are also consumables as they will wear down with play, this will change both the sound, playability, clarity of harmonics, the physical reach of the wheel etc.
In general, a completely round and soft wheel will inject very little "wheel sound" into the mix, but it will also emphasize the fundamental more than the individual harmonics. Thus wheels with "protrusions"