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What is internal wiring?  

  Wiring that connects the unit between terminals in the speaker box is pierced with internal wiring.

  If the length about 1.5 times the straight line distance of the unit is reserved from the terminal, it is safe because it has a hard time when the unit will be applied later when it is too short though the speaker cable is cut in necessary length and this line is used. Because internal wiring is a part where the vibration of the sound pressure is directly undertaken, the influence from the speaker cable (From the amplifier to the terminal) on the outside to the sound might be large. However, it has a hard time in the installation with the unit when the thick cable is too used.