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- The
opposition to the flow of electric or acoustic energy measured in ohms.
Source:
http://www.owenscorning.com/around/sound/glossary.asp
- Resistance to AC (alternating current) flow through a wire or circuit.
Different from resistance which is used for simple DC (direct current)
circuits. Impedance is frequency dependant. Abbreviated "Z" and measured in
ohms.
Typical speaker impedance is 4 to 8 ohms, professional microphone impedance is
200-250 ohms, consumer high-impedance microphones are 600+ohms. Typical
line-level inputs & outputs are 10,000 ohms (10K ohms). Video cable is 75 ohms
per mile, common computer coax cable is 50 ohms per mile.
Source: Church Audio & Acoustics Glossary
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