Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [speakers]

A speaker is a device which converts an electrical audio signal into a corresponding sound. Questions about fixing speakers will be closed as off-topic.

A speaker is a device which converts an electrical audio signal into a corresponding sound.

602 questions
41
votes
9 answers

How can "purely" electrical circuits emit sound?

Moving membranes or piezoelectric materials obviously produce sound waves, but how can "purely" electrical circuits such as transformers or DCDC choppers (and others) often have an audible noise? Is the material microscopically expanding and…
Mister Mystère
  • 9,477
  • 6
  • 51
  • 82
36
votes
4 answers

Headphone wire color coding

How do I tell which wire is which if I have a copper wire, red and green coded wire? Is the unshielded copper wire ground?
stanigator
  • 695
  • 1
  • 6
  • 12
34
votes
7 answers

Why does GSM cause speakers to buzz?

Based on numerous internet resources, speaker wire acts like an antenna which picks up the transmitted signal of nearby cellphones and causes the speakers to buzz. But I'm not really buying that... A 3.5 mm speaker cable is designed to carry 1 V.…
JSideris
  • 619
  • 1
  • 7
  • 13
21
votes
11 answers

What is the difference between a buzzer and a speaker and are there any other basic electric/electronic things that output sound?

I am playing with a speaker and a microcontroller and in some documentation the speaker is called buzzer. The assistant told us that is a mistake and we are dealing with a speaker. I am wondering what exactly is the difference between the two,…
yoyo_fun
  • 793
  • 1
  • 6
  • 17
21
votes
6 answers

Why are DC signals bad for loud speakers?

I googled and found out through some forum that: DC has a constant amplitude which overheats and destroys the voice coil of the speaker. Could someone clarify if this answer is complete and accurate?
Hilton Khadka
  • 811
  • 1
  • 13
  • 29
19
votes
5 answers

Why has my tweeter speaker burned up?

I bought a powerful tweeter (or so I thought) to experiment with the ultrasound. The device is quite heavy, and it is rated at "350 watts RMS/700 watts peak": 2'' Titanium Super Tweeter PDBT78 Its nominal impedance is "4-8 ohms" with a frequency…
SlowBot
  • 191
  • 1
  • 6
15
votes
5 answers

How are speakers matched with audio amplifiers? (avoiding overloading either)

I know a similar question title has been asked, but I believe that does not answer my question (and I couldn't think of a better way to phrase the question). I'm a bit confused by how exactly an amp can overload a speaker, and vice versa. Many…
midnightBlue
  • 1,805
  • 4
  • 21
  • 35
15
votes
5 answers

Why do cables specify 75 Ω impedance when impedance is a two-dimensional quantity?

As I understand it, impedance has an imaginary and a real part. To be able to perform any useful calculations, one needs to know both. Cables and speakers usually only say like "8 Ω" or "75 Ω". Is that purely resistive? If so, what is so special…
Stephen Hubschrauber
  • 147
  • 6
14
votes
2 answers

Does driving a speaker with a DC offset AC signal matter?

Do these two input signals have different effects on a speaker? An AC signal with some value of DC offset. Same AC signal but centered at 0 V.
muyustan
  • 2,046
  • 20
  • 54
13
votes
3 answers

Accidentally downmixed stereo to mono, why does this work?

I have a cheap Chinese Bluetooth audio amplifier like this: It has four screw terminals for the speaker connections, namely L+, L-, R+ and R-. I accidentally connected a single speaker to L+ and R-, and was surprised to find that I could hear both…
Bas
  • 463
  • 1
  • 7
  • 16
10
votes
2 answers

Where can I find specific examples of parameters for a loudspeaker circuit model?

When I look around for loudspeaker literature, I often encounter an equivalent electrical circuit model such as http://en.wikibooks.org/wiki/Acoustics/Acoustic_Loudspeaker#Modeling_the_loudspeaker_as_a_lumped_system (image shown from the linked…
Thomas Arildsen
  • 211
  • 2
  • 6
10
votes
4 answers

Why is this 3-way speaker wired this way?

I found a service manual of a pair of 3-way speakers that were part of a mini integrated stereo system. These are Sony SS-H77 speakers, which have served me very well back in the day. Looking at the wiring diagram (below), there is something very…
ysap
  • 345
  • 4
  • 16
10
votes
4 answers

If we use potentiometers as volume controls, don't they waste electric power?

I recently heard that we use potentiometers to reduce the volume levels in audio devices. Will it waste electrical energy?
Abin Latheef
  • 169
  • 3
  • 10
9
votes
2 answers

Use of 100K ohm resistor along with 0.1uF capacitor?

In the circuit diagram below, why is there a 100KΩ resistor (NOT R2) connected to the capacitor? To my understanding the capacitor-resistor act as a high pass filter to block the DC offset of the microphone, but since only the capacitor blocks DC…
putu06
  • 91
  • 1
  • 4
8
votes
2 answers

Matching Audio Amplifier with Speaker (Watts Rating/Output)

Background When selecting an amplifier and speaker, you are usually provided ratings or output in watts. For a speaker you get maximum and nominal watts rating, while for an amplifier you get output in watts. I am confused, because I have read that…
Remixed123
  • 307
  • 1
  • 5
  • 13
1
2 3
…
40 41