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Greenberg Notes 6
Audio Tech 1
37
Music
Undergraduate 1
03/01/2012

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Cards

Term
Speakers are what kind of transducers?
Definition
Speakers are double transducers.
Term
What are the three main types of speakers?
Definition
Electro Dynamic (Moving Coil)
Ribbon
Electro Static (Works on the theory of variable capacitance and has a hyped frequency response).
Term
What are the two OTHER types of speakers?
Definition
Piezo Electric (Tweeters)
Plasma (Laser shit that vibrates air)
Term
How many volts does a microphone emit?
Definition
Less than one, maybe 1/5th?
Term
Ribbon speakers and microphones have what in common?
What is it good for?
Definition
Corrugated aluminum.
It's good for high frequencies.
Term
Tweeters are used in conjunction with what?
Definition
Woofers.
Term
A speaker is a tweeter and woofer. Mids and highs go to what? Lows go to what?
Definition
Mids and Highs go to the tweeter. Lows go to the woofer.
Term
Describe a crossover.
Definition
It divides the sound frequency spectrum (20Hz-20kHz) into regions. It's how the mids and highs are decided to go to the tweeter and the lows to the woofer.
Term
Can one speaker reproduce 20Hz-20kHz?
Definition
No one speaker can reproduce 20Hz-20kHz.
Term
A tweeter is too small to reproduce low frequencies and vise versa.
Definition
N' shit.
Term
What is a horn?
Definition
A tweeter but louder, used on P.A. systems.
Term
What do ports do?
Definition
Ports allow for low frequencies to escape (usually in the front).
Term
4 volts = __ on a VU meter.
Definition
4 volts = 0, line level, on a VU meter.
Term
Sound travels in what direction?
What's the difference between lows and mids and highs?
Definition
All directions.
Lows are more omnidirectional between mids and highs.
Term
Powered Speaker Cables go to what kind of speaker?
Definition
Passive speakers.
Term
What is a speaker enclosure?
Definition
The box, body that the speaker's in.
Term
Describe a passive speaker. Describe an active speaker.
Definition

Passive speakers have no amp within the enclosure, it needs external amp, and powered signals are sent to it.

 

Active speakers have an amp in it, a power switch, it plugs into the wall, takes an XLR (balanced signal).

Term
Tweeter and woofer = ___ ___ speaker?
Tweeter, mid range and woofer = _____ ___ speaker?
Definition
Tweeter and woofer = Two way speaker.
Tweeter, mid range and woofer = Three way speaker.
Term
Describe what a passive crossover does. Descrive what an active crossover does.
Definition

A passive crossover takes a powered signal and divides sound frequency spectrum.

 

Active crossovers receive an unpowered signal (line) and sends out divided frequencies (still unpowered).

Term
Active speakers have what kind of crossover?
Definition
Active speakers have passive crossovers.
Term
Mic & Line ≠ _______?
Speaker = _______?
Definition
Mic & Line ≠ Powered
Speaker = Powered
Term
Speakers either come in ?, ?, and ? ohms.
Definition
Speakers either come in 4, 8, 16 ohms.
Term
Pro Audio, 600 ohms.
Definition
Dude, I don't know...
Term
An electric guitar gives out how many ohms?
Definition
8k-10k ohms.
Term
What size woofers are able to emit 20Hz?
Definition
18" woofers.
Term
Describe damping factor.
Definition
The measurement of how quickly a speaker’s cone reacts to an audio signal.
Term
What is transient response?
Definition
How quickly a mic's diaphragm reacts to a sound wave.
Term
The longer the cable, the _____ the damping (factor).
Definition
The longer the cable, the worse the damping (factor). High damping reacts quicker. Low damping is bad.
Term
Do active speakers have higher or lower damping compared to a passive speaker?
Definition
Active Speakers have higher damping because the cable is right next to the amp.
Term
Sub woofers are a separate speaker enclosure.
Definition
Rajah dat.
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