Feedback is positive when it's in phase with the input, and negative when it's out of phase. Flat response A componet has a flat response when all frequencies are equally emphasized. Having a flat frequency response is a desirable thing. Floor Standing Speaker A type of speaker designed to sit directly on the floor. This type of speaker doesn't need to have stands which elevate them to listening level.
Floor standing speakers generally cost more and produce more bass than bookshelf speakers.
Flying Erase Head Rotating erase head which is positioned on the video head disc, making the device ideally suited for editing video tapes with clean transitions. The Flying Erase Head is standard in Video S and Video Hi8 systems and high quality VHS recorders also make use of a Flying Erase Head. FM Tuner Sensitivity Indicates a receiver's capacity to tune FM radio signals. The lower the number, the better. This switch is not widely used any longer, but it allows you to match your amplifier output with that of your speakers.