How about a trifield stereo set up with 3 Phantoms

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Without special processing I'm using 3 Phanom Silver in triangular setup. Two configured as stereo in one room are placed left and right in front and the the third configured as single in another room is place in the back of my sitting position. Each is about 2m away from listing position. This gives me a dipole-like imaging that is more spatial than the stereo setup. I tried placement of the third speaker in front, but it resulted in narrowing down the stereo effect, which is natural considering the center speaker plays a summed signal from left and right channels. It would be very interesting when we could have an influence how left and right channels would be processed in Spark: summation, substraction, different attenuations etc. At least with the multi-room configuration I can select different volumes when using the desktop version of Spark. Devialet at some point crippeled down the mobile version and removed individual volume setting in the mobile apps of Spark. Looking forward to see this feature coming back in a future update.