Use long XLR cables from your gear kept on the side to the amp in-between the speakers. If you have well designed gear the XLR quality should not make that much of a difference so you can use cheaper (but very good) XLR, such as pro XLR's. You can then get better and shorter speaker cables which I find make a huge difference.
My XLR's from the preamp to the amp are 15 feet (could be a longer If need be), and my speaker cables are only 3 or 4 foot. XLR's cost $250 and the speaker cables $3500.
My XLR's from the preamp to the amp are 15 feet (could be a longer If need be), and my speaker cables are only 3 or 4 foot. XLR's cost $250 and the speaker cables $3500.