sfrounds- you are only half right. The speakers need to be set up to biwire, with separate + & - for LF and Mid/HF on each side. The amp, however, can and typically does have only one set of outputs. Imagine 2 + and 2 - for each channel at speaker end (for LF and Mid/HF). Then imagine the two + terminated together at the amp end, and the
2 - also terminated together. Therefore, there are two terminations per channel at the amp end, 4 per channel at the speaker end. In actuality, the cables can be entirely separate (just terminated together at the amp end) in a dual or shotgun biwire, or there can be + LF and + mid/HF together inside one jacket and - LF and - mid/HF in another jacket (called internal or single biwire).
2 - also terminated together. Therefore, there are two terminations per channel at the amp end, 4 per channel at the speaker end. In actuality, the cables can be entirely separate (just terminated together at the amp end) in a dual or shotgun biwire, or there can be + LF and + mid/HF together inside one jacket and - LF and - mid/HF in another jacket (called internal or single biwire).