Shotgun or dual biwire consists of two discrete cable runs per channel. The two + sides are terminated together and connected to the + output on the amp. Same for the two - sides. At the speaker end, one run drives the LF and one run the HF drivers. Requires twice as much cable, but obviously you end up with a heavier guage to each driver. Some say better, others say not, some say bi-wire makes no difference. I personally run shotgun biwire T-14, but have not compared it to single (also called internal biwire). A fair test would be somewhat difficult to set up.
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