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Sound Dynamics
Quiz 2 (4,5,6)
90
Anthropology
5th Grade
12/10/2008

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Cards

Term

t or f: a transducer converts one type of energy to another

 

Definition
true
Term
what does an output transducer do?
Definition
converts electrical energy to acoustic energy
Term
what is the most common transducer type?
Definition
electromagnetic
Term
on a cone type driver, is the Magnet Assembly considered replaceable?
Definition
no
Term
name the part of the speaker assembly that connects the cone to the basket on the outside
Definition
surround
Term
which two components of the speaker assembly are responsible for the movement of the assembly?
Definition
voice coil and magnet
Term
a cone driver is one type of e.m. speaker, name the other type.
Definition
compression
Term
what is the replaceable part in a compression driver?
Definition
diaphragm
Term
t or f: a horn is also known as a wave guide
Definition
true
Term
if a horn dispersion pattern reads 90x60, what do these numbers mean?
Definition
90 degrees horizontal and 60 degrees vertical
Term
over-excursion can be described as ?
Definition
moving the assembly too far forward and back
Term
t or f: over-excursion can or will physically damage the assembly
Definition
true
Term
can underpowering a loudspeaker damage it?
Definition
yes
Term
t or f: square waves can damage a speaker
Definition
true
Term
t or f: the process of repairing a speaker is called re-coning
Definition
true
Term
what are the 3 ways of wiring together multiple loudspeakers?
Definition
parallel, series, series/parallel
Term
which speaker wiring method will lower the overall ohm rating?
Definition
parallel
Term
two 8-ohm speakers wired in parallel configuration will yeild ___-ohm value
Definition
4
Term
which speaker wiring method will increase the overall ohm rating?
Definition
series
Term
two 8-ohm speakers wired with series configuration will yeild a ___-ohm value
Definition
16
Term
name the speaker wiring strategy that is a combination of both parallel and series
Definition
series/parallel
Term
four 16-ohm speakers wired with s/p configuration will yeild a __-ohm value
Definition
16
Term
t or f: an amplifier is designed to increase the power of something
Definition
true
Term
power is defined as the amount of measured energy over time. what is the unit of measurement used in the electric realm?
Definition
watts
Term
t or f: distortion can be defined as the output being exactly the same as the input.
Definition
false: the output is somehow different than the input
Term
the first amplifiers were used for what?
Definition
radio transmitters
Term
what class of amplifier is said to be the most accurate or best sounding?
Definition
class a
Term
what class of amplifier is the most energy efficient (least heat producing)?
Definition
class d
Term
t or f: class d amps infer digital
Definition
false
Term
what sets apart class d and class i from the rest?
Definition
they are "switching" amps
Term
which amps classes use multiple power supplies?
Definition
g and h
Term
most subwoofer amps might be class __
Definition
d
Term
which indicator light lets the user know that the amplier is on?
Definition
active
Term
t or f: the signal indicator light on most amplifiers indicates input
Definition
true
Term
t or f: lights with levels displayed next to them (-10, -6, etc) indicate input levels as well
Definition
false: they indicate output levels
Term
a clip light steadily lit for any length of time could:
Definition

damage both speakers and amplifiers

Term
if the protect light came on, then:
Definition
the amp has shut down
Term

an amp will go into protect mode because it:

a. is overheating

b. it is being overdriven

c. the amp will lower its output to a safe level

d. any of the above

Definition
any of the above
Term
the outputs on a professional amp are typically:
Definition
binding posts
Term
t or f: speakon connectors are also available on some amps
Definition
true
Term
an amp runnig 2 in/2 out is said to be in the ___ mode
Definition
stereo
Term
an amp operating as 1 in/2 out is in the ___ mode
Definition
parallel
Term
when a 2 channel amp has been converted to a one-channel amp (1 in/1 out), it is in the ___ mode
Definition
bridged
Term
when performing the bridged mode process, what outputs of a p.a. amp must be used?
Definition
use the 2 positive outputs
Term
the ohms rating at which an amp operates is determined by:
Definition
the nominal impedance (load) of the speaker(s)
Term
if a speaker load is cut in half, will the output of the amp double?
Definition
some will; some won't; it depends on the individual amp
Term
t or f: if an amp does not have a 2-ohm rating, it is ok to run it at 2 ohms
Definition
false
Term
t or f: if an amp does not have a 16-ohm rating, it is okay to run it at 16 ohms
Definition
true
Term
which amp power rating is the most accurate?
Definition
20hz - 20khz
Term
for amps being used in the limited bandwidth applications, what spec is acceptable for use?
Definition
1khz
Term
t or f: speakers will be matched to the requirements of the amps
Definition
false: amps are matched to the requirements of speakers
Term
t or f: it is harmful to operate one channel of a professional amp at 8 ohms and the other at 4 ohms
Definition
false
Term
most p.a. speakers should be given ____
Definition
somewhere between their program and peak ratings
Term
what component can handle up to 200 percent overpowering?
Definition
compression driver
Term
t or f: the speaker wiring of a group of speakers will affect the power requirements for that group
Definition
false
Term
t or f: the speaker wiring of a group of speakers will affect the power output of an amp
Definition
true
Term
a crossover is:
Definition
a frequency-dividing network
Term
a 3-way system has how many frequency ranges?
Definition
3
Term
a typical house p.a. system is:
Definition
3 way or 4 way
Term
a passive crossover is positioned:
Definition
after amplification
Term
an active crossover is positioned:
Definition
before amplification
Term
a bi-amped or tri-amped speaker or system employs:
Definition
multiple amps or channels
Term
in a filter, the section that is unaffected is called the:
Definition
pass band
Term
in a filter, the section where attenuation begins is called the:
Definition
transfer area
Term
in a filter set, the place where the 2 opposing filters meet is called the:
Definition
crossover point
Term
if one is set to a console's high-pass filter at 100hz, that 100hz is measured at the:
Definition
knee frequency
Term
in a filter, the section that is fully attenuated is called the:
Definition
stop band
Term
t or f: the filter slope is measured in dB per octave
Definition
true
Term
each order of slope is equivilant to:
Definition
6 dB per octave
Term
a third order slope is said to have a rolloff of:
Definition
18 dB/oct
Term
what is the roll off rate of a fourth order filter?
Definition
24 dB/oct
Term
the shape of a filter is significant to what particular section?
Definition
the transfer area
Term
which type of filter is considered to be the top-of-the-line professional filter?
Definition
linkwitz/riley
Term
the electronic alignment of 2 or more loudspeaker components is known as:
Definition
time alignment, time correction, or phase coherency
Term
t or f: misaligned speaker components will cause part of the sound from a loudspeaker to beam or "tilt" up or down
Definition
true
Term
t or f: an analog crossover's controls adjust each high- and low-pass filter individually
Definition
false
Term
a typical analog 2 way stereo can be configured to operate as a:
Definition
3 way mono
Term
in the digital crossover's crossover menu, the user can adjust:
Definition
each filter, slope, and shape
Term
band-limiting can be defined as:
Definition
frequency dependent limiting
Term
all digital crossovers always contain these 2 things:
Definition
time correction and parametric band eqs
Term
a digital crossover's configuration limitations depend on:
Definition
the number of input/output connections
Term
how many outputs does a stereo 3 way system require?
Definition
8
Term
t or f: a system limiter could be used as a system compressor in some applications
Definition
true
Term
t or f: even with the most advanced system management units, a system eq is not necessary
Definition
false
Term
what type of filter will have it's bandwidth change when the amplitude changes?
Definition
adapta-q
Term
what 2 things does an RTA measure?
Definition
frequency and amplitude
Term

Of the dispersion patterns below, which one will "throw" sound the furthest?

a. 90 x 90

b. 40 x 20

c. 30 x 10

d. 70 x 55

Definition
30 x 10
Term

 of all the speaker power ratings published, which one is the most relevant?

Definition
program
Term
typically for a PA loudspeaker, can anyone perform re-coning and/or purchase the factory-approved components?
Definition
no
Term
by sheer numbers utilized, amplifiers used in full-range applications would most likely be (2 answers):
Definition
class h and class ab
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