That is a little misleading. You are correct that you need to balance the ohm load. However, if you have 2 component speakers (left and right) on the front that are 4 ohm each that means the front is loaded with 8 ohms...hence you need an 8 ohm sub on the rear channel if it is bridged. If I were using the rear in stereo, I would agree with you that 4 ohms on each right and left would be appropriate.
This configuration is straight out of the JL 300/4 owners manual.
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