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.

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39
votes
9answers
10k views

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 ...
33
votes
4answers
303k views

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?
30
votes
7answers
22k views

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 ...
20
votes
6answers
24k views

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 ...
19
votes
11answers
29k views

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 ...
18
votes
5answers
4k views

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 ...
14
votes
2answers
2k views

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.
14
votes
5answers
46k views

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 ...
13
votes
3answers
4k views

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-, ...
10
votes
4answers
4k views

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?
9
votes
2answers
4k views

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 ...
8
votes
6answers
26k views

Can computer speakers emit ultrasound?

Can computer speakers emit ultrasound? What is the maximum frequency that computer speakers can produce?
8
votes
5answers
2k views

Amplifier speaker outputs: is the black always the chassis?

Any amplifier or A/V receiver that I have seen has a black and a red terminal for each speaker. From 2 pairs for a simple stereo system up to 7 or more for an A/V receiver. It is quite a while ...
8
votes
2answers
1k views

Why is my loudspeaker not working? From Make: Electronics

I am a complete beginner in the world of electronics and I am following the amazing book by Charles Platt, Make: Electronics (second edition). I am stuck at Experiment 11, when I need to connect an ...
8
votes
2answers
3k views

Parallel speakers sound bad, but serials are fine

I have made a simple speaker circuit. It sounds (at least to me) surprisingly good (though an audiophile would probably scream out loud and run away). I have currently run across a problem. To ...
8
votes
2answers
40k views

Connect speaker output to microphone input

What exactly is the difference between a microphone signal and a speaker signal? I want to make a simple cable to connect a PC speaker output to a microphone input. Does anyone have a good idea or ...
8
votes
1answer
437 views

Are the two wires of a speaker identical?

I am working with speakers for the first time. There are two lines, one black and one white. Are they the same? Is one defined as hi-voltage and another as low?
8
votes
1answer
6k views

Why are loudspeakers manufactured in various impedance values?

I'm acquainted with the concept of impedance matching in audio applications, but there's something that eludes me. First, a snippet from a home theater site: Loudspeakers have impedances of 8 ohms, ...
8
votes
2answers
18k views

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 ...
8
votes
2answers
4k views

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#...
8
votes
1answer
529 views

Handling Transient Currents on USB Powered Devices

I'm working on a USB-powered speaker design and could use some thoughts or design inputs from the community. The data part is pretty simple - USB powers an I2S bridge that talks to an I2S amplifer. ...
7
votes
3answers
62k views

How to determine appropriate speaker cable gauge?

When wiring speakers to a 100W consumer-grade amplifier, how do I select an appropriate gauge cable (for 8-ohm speakers)? Also, if 14 gauge cable is sufficient, what harm is there in using a heavier ...
7
votes
4answers
3k views

building an audio amplifier for 2.5 ohm speakers

I recently dug out of my box o' stuff a pair of seemingly decent 2.5ohm bookshelf speakers. I wired them to an old mp3 player I have and while they sound good at low volumes, I get lots of distortion ...
7
votes
3answers
3k views

Problems with Atari Punk Console circuit

I am trying to build an APC using the following schematic: (source: instructables.com) And the output is having some issues. Sound only comes out when the rightmost potentiometer is at 0 resistance, ...
6
votes
3answers
3k views

Driving a speaker directly through an audio DAC?

I have a project where I'll need to generate some sound waves. In case it matters, the microcontroller I'll be using is an STM32L476RG which have an internal DAC. The question I have is related with ...
6
votes
1answer
887 views

What is the physical meaning of resistance and power ratings of a loudspeaker?

What exactly does it mean when it is specified that internal impedance (or resistance?) of a loudspeaker is 16 \$\Omega\$? Is that ohmic resistance of the copper of its internal winding? Or is it ...
6
votes
3answers
1k views

Troubleshooting Circuit (Make: Electronics Experiment 11)

Would someone be so kind as to help me figure out why my circuit is not working? I am having difficulties with Experiment 11, Steps 2 & 3 in Charles Platt's book. The experiment is designed to ...
5
votes
3answers
4k views

Shouldn't these headphone wires be insulated?

My headphones sometimes don't put out sound in one of the channels, so I opened them up and this question came to mind: Shouldn't the 3 copper cables that connect to the mini-jack be insulated? One ...
5
votes
6answers
5k views

High impedance loudspeakers

Available speakers all seem to be low impedance like 4 or 8 ohms etc. Philips used to make speakers of 800 ohms for their SRPP valve stereo amplifiers. The speakers weren't that great even in 1958. ...
5
votes
3answers
2k views

How are loudspeakers able to play many different sounds at the same time?

I know this is kind of a lame question, but I wanted to know how loudspeakers are able to play so many different sounds at the same time. Like, in a song we can hear the voice of the singer and all ...
5
votes
2answers
4k views

Which capacitor for DC blocking in audio applications?

Which capacitor (electrolytic, film, ceramic) do you use for DC blocking in audio applications? From what I have seen most people use electrolytic capacitors. But, also from power decoupling theory ...
5
votes
2answers
1k views

Does higher impedance speakers generate clearer voice?

I have a PAM8403 based amplifier module and going to build a small portable speaker, mostly to listen to lectures and audio books. The module looks like this: First I attached two 4 ohms 3 watts ...
5
votes
5answers
8k views

trigger alarm with relay from PC sound output

As a total beginner, I have a project of creating an alarm device for a sailing boat. The background is the following: a Mac-mini collects, by means of different computer programs, alarms from ...
5
votes
4answers
6k views

Speaker vs. amplifier wattage matching [closed]

Is there any rule-of-thumb for choosing amplifier wattage for the given speakers wattage? For example, I have speakers, 100 W (max. input power) / 6 Ohm each. Is it ok to match them with 44 W (min. ...
5
votes
5answers
7k views

Why place capacitors in front of the line to a (headphone) audio speaker?

I'm using this module based on the popular bluetooth module CSR8635 https://www.tinyosshop.com/index.php?route=product/product&product_id=875 I was wondering why, in the right-hand side of the ...
5
votes
2answers
5k views

What is the reason for adding a buffer stage?

I was following this microphone and speaker circuit and I could follow mostly but got confused when the author introduces a DAC buffer. http://www.instructables.com/id/Arduino-Audio-Output/?ALLSTEPS ...
5
votes
2answers
8k views

How do you tell the difference between speakers and microphones?

How do you tell the difference between speakers and microphones? I pulled the following two components out of an old cell phone and cannot tell them apart. Each have two metal contacts on the back.
4
votes
4answers
38k views

What is the typical max voltage out of a PC speaker Jack?

I'm trying to use CD4051BCN chip to channel some speaker outputs from a computer. these chips handle analog voltages from +/-5V. What is the audio line max/min Voltage coming out of the desktop PC? I ...
4
votes
3answers
3k views

Can I use a subwoofer as a linear actuator?

I need an actuator with a few mm of travel and it has to be very responsive to a very low frequency (DC 10 Hz) sine wave generated by a function generator. I'm thinking of getting a cheap subwoofer ...
4
votes
4answers
19k views

What should attaching another magnet to the back of the speaker magnet do?

The dupe speaker I have here 8 \$\Omega\$ 0.5W had it's magnet split from the coil/cone. So I did something thoughtless - attached the speaker magnet to the back of the other speaker (same specs). ...
4
votes
2answers
406 views

Should stereo speaker cables be elevated to avoid static electricity

I am contemplating a new design for speaker cable stand-offs. I am unable to find support, only opinions, about static electricity produced by carpet affecting AC current between amplifiers and ...
4
votes
2answers
1k views

Device to loopback mic to headphones

I have an issue with my headset. I can’t stand not being able to hear myself speak. I’d like to build a passive device to loopback the mic to the headphones that would be plugged in-line between the ...
4
votes
1answer
171 views

What does exactly mean the power specified in a speaker datasheet?

I'm making my own guitar tube amp, based on a Fender 5e3 project. The nominal power of the amp is around 15W. Next step would be to choose a speaker, that I already did, the speaker is a 12 inches (8 ...
4
votes
1answer
98 views

Which speaker is better for an application based on it's datasheet

Given two speakers and their datasheets what should I be looking at to determine if one is better for me than the other? I realize this could be a broad question, but I'll frame it in my context. I'...
4
votes
2answers
922 views

Which is broken, the amp or the driver of this subwoofer?

My subwoofer (with an internal amp) is showing difficulty reproducing low frequency sounds (sine 30Hz ~ 70Hz). As I lower the frequency, around 70Hz, I start hearing very slight distortion (hint of ...
4
votes
2answers
661 views

Relation between the impedance of speaker and amplitude of sin wave?

I have an oscillator producing a sine wave with amplitude 3 V (so it oscillates between +3 V and -3 V). The oscillator is at about 500 Hz. I connected this to an 8 ohm speaker and I hear the sound ...
4
votes
2answers
2k views

How to replace a 50 ohm speaker with 25 ohm speaker?

I'm repairing an electronic device at home. Actually it has a non functional speaker. So I've to change it. This speaker is a 50 Ohm, 0.2 Watt. But I didn't find this one on the market, what I could ...
4
votes
1answer
334 views

Before I build: will this circuit work, or have I overlooked something?

I'm an engineering student (ChemE), just starting to get in to electronics and electrical engineering. Next semester I'm planning on adding an electrical engineering minor, but I wanted to get some ...
4
votes
1answer
7k views

Calculating impedance in a two-way speaker crossover

I'm trying to come up with a basic two-way crossover for a speaker I'm building out of scrap. (Working with what I've got - no new parts.) My amp handles 8-16 ohms. Here's what I've come up with for ...
3
votes
5answers
5k views

Reduce audio amplifier output power [closed]

I need some help to adjust the volume of the amplifier. It is a 2.5 W amplifier and it has to be connected to a 2 W speaker. I want to reduce the gain of the amplifier in order to avoid damage to the ...

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