I use passive speakers (no plug) and they sound great. Be aware that this kit is 2x40 watts and the wireless transmitter and receiver both need to be plugged into a power outlet. So if you have heavy duty speakers higher than 40 watts, they probably will work with this kit but you won't get as much kick as if you wired them. I just bought a pair of 40W bookshelf speakers and stands and the wireless conversion kit does a good job with them.