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Mobile Electronics Glossary of Terms and Definitions - X

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Mobile Electronics Glossary - X
  XM Radio - XM Radio broadcasts 100 channels of totally new music, news, sports and children's programming direct to cars and homes via satellite an extensive repeater network, which supplements the satellite signal to ensure seamless transmission. The channels originate from XM's broadcast center, the world's largest all-digital studio complex in Washington, DC, and uplink to two Boeing 702 satellites. These satellites transmit the signal across the entire continental United States. Each satellite provides 18kw of total power making them the two most powerful commercial satellites ever built, providing coast-to-coast coverage.
  Xmax/Xmech - Maximum peak linear excursion of driver, in meters. "Short for Maximum Linear Excursion. Speaker output becomes non-linear when the voice coil begins to leave the magnetic gap. Although suspensions can create non-linearity in output, the point at which the number of turns in the gap (see BL) begins to decrease is when distortion starts to increase. Eminence has historically been very conservative with this measurement and indicated only the voice coil overhang (Xmax: Voice coil height minus top plate thickness, divided by 2). Xmech is expressed by Eminence as the lowest of four potential failure condition measurements times 2: Spider crashing on top plate; Voice coil bottoming on back plate; Voice coil coming out of gap above core; Physical limitation of cone. Take the lowest of these measurements then multiply it by two. This gives a distance that describes the maximum mechanical movement of the cone."
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Mobile Electronics Basics:
Diodes
Glossary of Terms and Definitions
Ohm's Law
Recommended Books & DVD's
Recommended Wire Sizes
Relays
Resistors
Tools and Equipment


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