@CrazyRiver
Explanation. 
The reason for this is that you always have the same impedance between the amplifier output and any drive unit in the system (the length of speaker cable plus one full link plate). It is also important that the negative wire goes to the bass negative as it gives the clearest path for the back e.m.f. from the bass driver to be sunk back through the amplifier, reducing its influence on the other drivers in the speaker.
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