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"Just a few lines to feedback regarding the wonderful reel-to-reel transfer you did for me. I received the updated CD yesterday and was absolutely delighted! The new CD contains mostly conversation and giggling between my son and I when he was only three years old. For his 35th birthday I wanted to surprise him with these memories but I only had ..."

Dynamic speaker

Also termed a moving-coil speaker. The moving diaphragm is attached to a coil, which is conductively connected to the source of electric energy and placed in a constant magnetic field. The current through the coil interacts with the magnetic field, causing the coil and diaphragm to move back and forth in accordance with the current variations through the coil.