True the same length is important, so that the signal timing is accurate for all speakers. Otherwise you might hear an echo effect if the lengths are not even. So if you want to do it right equal lenths of the front two channels and equal length of the rear two channels.
1999 Silver Frost Contour SVT
2690 of 2760 Born 08/13/1999
Sony Mobile ES CDX-C90 Deck
6 1/2 Infinity Kappa Perfect mid & tweet set, 2 12" Infinity Kappa Perfects JBL P.600.1 for Bass, P.180.2 for front stage.
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