Only tested for power, when powered on there is initial sound from the speaker as it powers on, but I have not tested these with equipment. In great condition with cast aluminum boxes. These were pulled from an estate sale of a music composers home. These were in a media room with many pieces of recording and playing devices ranging from the 1960’s through to current audio. From reel to reel players to digital multimedia players. (See my other listings). As stated, I haven’t tested these, but everything around them was professional equipment. Coming to you with the AC cords, and audio cords. The chords have handwritten notes stapled to them, seemingly directions on how to hook them up. Cosmetically in great condition, but there’s slight ware on the aluminum boxes as I pictured. NO POST OFFICE BOX NUMBERS PLEASE.