Some PA jobs call for sound over a big area, but you can’t always do it just by cranking up the volume. By placing multiple speakers at strategic points throughout the venue, you can good sound at a proper level. But what about the cords? Well, VocoPro says their Air-Net wireless speaker transmiiter/receiver system will reliably send a signal to a speaker 150′ away. Ok, they say 150′ so lets see how how close we can come to 250′.