In my opinion, the equal speaker cable length requirement is a myth. As long as your speaker cables are of a reasonably heavy gauge (low resistance), you can use whatever lengths you want. For speaker cables, I would recommend 16 AWG or higher (preferably 10-14 AWG). I hope this helped.
John Coleman Cobalt Cable
i HAVE A SONY ACTIVE SPEAKER SYSTEM mODEL #SA-VA3A wHERE CAN I GET R-CH OUTPUT INPUT CABLE