Sound Reinforcement Flashcards

1
Q

Electricity

A

The flow of electrons

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2
Q

Voltage (V)

A

Measurement of electrical pressure or potential as compared to a zero ground potential.

Can be thought of as: potential energy

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3
Q

Voltage

A

Unit of electromotive force or electrical pressure. One volt is required to send One ampere of current through a resistance of one Ohm.

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4
Q

Current and Ampere

A

Measurement of how many electrons pass through a reference point each seconds. Measured in amperes (A) or (I)

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5
Q

Resistance (R)

A

Property of a conductor that determines the amount of current that will flow as the result of the application of a given electromotive force

Limiting current flows it is referred to as a resistor

Dissipates through heat loss

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6
Q

Ohm

A

Ohm is a unit of electrical resistance

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7
Q

Impedance (Z)

A

Total opposition offered to the flow of an alternating current

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8
Q

Earth ground

A

Ground that uses electrical potential of the earth as a reference

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9
Q

Signal ground

A

Signal potentials (voltages) in a specific piece of equipment such as a microphone

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10
Q

Chassis ground

A

Any conductor that is connected to the devices chassis, ultimately drains to earth ground

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11
Q

dB SPL stands for

A

Decibel Sound Pressure Level
Measure of sound pressure in decibels

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12
Q

Microphone level

A

Lowest level
No signal to -20 dBu

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13
Q

Line level

A

Midrange
-20 dBu to +30 dBu
ie. Mixing console

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14
Q

Speaker level

A

Highest level
Everything above +30 dBu
ie. Power amplifiers

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15
Q

Gain

A

Increase in amplitude of a signal
Expressed in dB

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16
Q

Attenuation

A

A reduction of the amplitude of a signal

17
Q

Shielding

A

Protecting electronic equipment from electromagnetic or magnetic interference (surround with copper or aluminum and other metals)

18
Q

Cable Gauge

A

Refers to the diameter of a cable used to carry energy

The higher the gauge # the smaller the diameter the cable will be, and the opposite for lower gauge

Larger cables carry more current and best for long distances

19
Q

AWG stands for?

A

American Wire Gauge

20
Q

EMI

A

Electromagnetic Interference
Interference generated from an outside element

21
Q

RFI

A

Radio Frequency Interference

22
Q

Electrostatic Interference

A

Unwanted frequencies which can be transmitted between wires

23
Q

Tip-sleeve (TS)

A

Single conductor shielded cable

24
Q

Tip-ring-sleeve (TRS)

A

Dual shielded cables and extra conductor on the shaft. Can run left and right mono signals for stereo output

25
IEC
International Electrotechnical Commison C1-C24 Most common: C13 and C14 Rates up to 250V AC
26
RJ45
Registered Jack For network and telecommunication connections
27
Neutrik Ethercon vs Neutrik Speakon
Speakon are blue and meant for speakers Ethercon is essentially an RJ45 for audio/video/lighting (Avioms)
28
OSHA
Occupational Safety and Health Administration
29
DI Box
Direct injection box Convert unbalanced, high impedance signals to low impedance microphone level signal
30
Condenser microphone
Costly, more sensitive to temperature and humidity, not as good for live sound as dynamic microphones are Requires phantom power of 48 vdc from the mixing console