Live Sound 2 Quiz 1

Front 1

Define live sound dynamic range

Back 1

Difference in dB between noise floor and max system output before distortion

Front 2

Difference in dB between A-weight and C-weight?

Back 2

3dB

Front 3

is A-Weight louder or C-Weight?

Back 3

C-Weight -- A-Weight has a bass rolloff.

Front 4

White noise is physically defined as:

Back 4

Electrons moving through the system

Front 5

White noise has ____ energy across all frequency peaks.

Back 5

Equal

Front 6

White noise has a ____dB increase per octave.

Back 6

3dB

Front 7

Pink noise has a ___dB rolloff at every ____.

Back 7

3dB, Octave

Front 8

Popcorn noise is caused by:

Back 8

Poor maintenance on gear/mishandling equipment.

Front 9

Harmonic distortion is caused by:

Back 9

Weak, passive systems and excessive EQ.

Front 10

Voice Coil:

Back 10

Flat coil housed between the Gap.

Front 11

Pole Piece:

Back 11

Steel rod inserted into donut shaped magnet

Front 12

Gap:

Back 12

Space between magnet and pole piece, houses voice coil

Front 13

Dome:

Back 13

Dust cover over the gap

Front 14

Spider:

Back 14

Attaches voice coil to cone and dome.

Front 15

Cone:

Back 15

Attached to the basket.

Front 16

Basket:

Back 16

Shape of the driver

Front 17

Frequency response:

Back 17

A component's ability to reproduce output of the same freq range as source

Front 18

State of tolerance:

Back 18

Ability of an amp to produce intended freq response (often +/- 3dB

Front 19

Continuous rating:

Back 19

Low level signal sent to speaker for a long time to determine when voice coil breaks from heat.

Front 20

Program rating:

Back 20

Represents capability of speakers during the show, used to match speaker to amplifier.

Front 21

Peak rating:

Back 21

Measures 1/10th of a second of extremely loud signal.

Front 22

Sensitivity rating wattage:

Back 22

1 watt @ 1 meter
1 watt @ 4 feet
1mwatt @ 30 feet

Front 23

VCO:

Back 23

Variable Control Oscillator

Front 24

Compression drivers:

Back 24

"horn." have natural compression in throat, used on high frequencies

Front 25

Direct radiator:

Back 25

Woofer

Front 26

Enclosure:

Back 26

Prevents voice coil from moving when signal is not being passed.

Front 27

Port:

Back 27

Used to reinforce sound of low frequencies. Will allow certain frequencies to pass, has a delay.

Front 28

Stationary Magnetic field:

Back 28

Magnetic field is the result of voice coil surrounded by magnet.

Front 29

Secondary magnetic field:

Back 29

Magnetic field is the result of the amplifier output through the voice coil.

Front 30

Transduction of loudspeaker is the result of:

Back 30

Interaction between the stationary magnetic field and the secondary.

Front 31

Disadvantages of using speakers in series

Back 31

If one fails they all do. Too much impedance, less power due to Ohms Law

Front 32

Pressure:

Back 32

(Voltage) Measured in Volts; AC: V; DC:E

Front 33

Work Done:

Back 33

(Power) Measured in Watts; AC/DC: P

Front 34

Flow:

Back 34

(Current) Measured in Amps; AC/DC: I

Front 35

Restriction

Back 35

(Resistance) Measured in Ohms; AC: Z; DC: R

Front 36

If "I" goes up, "V" goes

Back 36

Up

Front 37

If "V" goes up, "Z" goes

Back 37

Down.

Front 38

Pressure formula:

Back 38

"I" = V divided by Z

Front 39

Work Done formula:

Back 39

P=I times V

Front 40

Work Done Concept:

Back 40

Power is proportional to both voltage and the flow of electrons.

Front 41

An increase in power is the result of

Back 41

both I and V.

Front 42

When bridging from an amp:

Back 42

Take the + out of L ch. into + of speaker, + of right amp ch. into - of speaker