Holes for running speaker wire can be drilled one inch from the welds on the front or rear legs. MTK towers come pre-drilled. Holes can also be added to the top section three inches in from the welds in the straight cross bar of the top section. If you add top section speakers or lights the wire will exit the top of the rear legs and enter the side of the top section. This short "bridge" will connect the top section to the legs electrically. Detailed wiring instructions are included in our speaker installation manual.