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Video instructions and help with filling out and completing What is irs form 668 z
Instructions and Help about What is irs form 668 z
Hi we have posted a series of videos on sound Music about a year ago we put a couple of videos online covering our DML or distributed mode loudspeakers we've showed how you can use helium to inhibit the transmission of sound built an active noise reduction enclosure and constructed some sound absorbing panels that you can hang on the walls of your studio or your listening room today what I'm going to do is I'm going to go through the principals and the Assembly of more conventional speakers these are called void tubes and they were first described by Paul Voight in 1934 now you might say wow that's a pretty old design but keep in mind that was 17 years after Einstein released his theory of general relativity so just because something's been around for a while that doesn't mean it isn't a good idea to understand what makes this design so elegant we have to understand what's going on with a speaker a typical loudspeaker consists of two elements a thin membrane that's made out of either paper plastic bamboo metal and a voice coil a driver in the back and the driver essentially has a huge number of coils a very fine wire that are attached to your amplifier and by varying the polarity and the current flowing through those coils you vary the electric field and the magnet that's inside of that coil then moves in response to those changes and drives the movement of the membrane in front when the membrane moves forward it compresses a small sheet or a thin sheet of air and that air moves away from the speaker at the speed of sound about 300 meters a second when it moves backwards it produces a rare occasion node in that air and that also moves outward at the same speed and so as it vibrates back and forth it's producing repetitive high and low pressure zones that are moving outward and eventually they hit your ear and you hear sound that's simple that's straightforward work it's more interesting and more complicated is what's happening on the back of the speaker because of the scale of sound waves this membrane is effectively negligibly thick it's a two dimensional structure and so when the voice coil is moving the front of the membrane forward in producing a high pressure zone from the point of view of the back it's moving backwards and producing a low pressure zone when it moves backwards this way it's producing a high pressure zone here and a low pressure zone here so the sound waves are emanating from both surfaces of the speaker but they are a hundred and eighty degrees out of phase with each other now when the speaker is hanging in a room eventually the sound waves that are traveling backward from the rear surface are going to hit a wall or a surface and they will reflect off that surface and move.