Hello, actually we have bought 6 xd-v75 systems with handheld, headset and lavaliers. While we were testing the systems we have discovered about 2 problems; the first one is with handheld: when you are talking or singing more or less strong sounds a “clicks†too loud high and It´s like a compression feeling. That do it in all systems with every microphone. We try wires, mixes, speakers and differents places, as well to try differents frequencies, 2 rf´s ways etc and the problems continues. The second problem is with the bodypacks; working with headset is all right but working with lavaliers sounds a high frecuency whine. That do it in everything systems and microphones. All of them are line6 originals. I´ve seen in this forum the same problems and never find the solution. Thank You