Speaker Definition and 119 Threads

Homework Statement Sound exits a diffraction horn loudspeaker through a rectangular opening like a small doorway. Such a loudspeaker is mounted outside on a pole. In winter, when the temperature is 273 K, the diffraction angle θ has a value of 11°. What is the diffraction angle for the same...

Hi Guys I usually post in the Quantum Physics section because that in my interest these days. I have recently been in a rather heated discussion about an interesting device a speaker designer I know (Mike Lenehan) recently bought to market...

Hi! I aim to use a piezoelectric wafer and get it to work as a loudspeaker by supplying it with a fluctuating voltage withing the audible region. I know this can be done using a simple DC to AC invertor/oscillator circuit, but the challenge is to build it as small as possible. I looked up...

Hi there, I'm building a speaker for my intro to EE class. We were given ten small washer magnets, some washers, a nut and a bolt. Enameled wire is also provided. My group prototyped a speaker with the following configuration: Voice coil wrapped around a paper tube which fits around the bolt...

Homework Statement A block with a speaker bolted to right side of it is put on the table. The left side of the block is connected to a spring having spring constant k and the block is free to oscillate in horizontal direction. The total mass of the block and speaker is m, and the amplitude of...

I want to create a little circuit thing. Ill explain it in a diagram below. Basically I have 1 set of speakers and 2 computers. I want to create a switch that will let me switch between which computer is playing on the speakers. Nothing complicated so far. However I want there to be an LED...

One of my studio monitors went dead the other day. M-Audio BX5a - active monitors. Now it doesn't power up at all. All you get is an extremely faint hum near the power supply - almost silent. I checked the fuses and they look fine to my naive eye - no discoloration and the wires are intact. Any...

This has been going around, but it's interesting enough to read. http://online.wsj.com/article/SB10001424052702304811304577366332400453796.html?mod=googlenews_wsj

Homework Statement We are modeling the tweeter of speaker and its enclosure with the circuit shown in the figure attached. We are also given an "magnitude of input impedance" curve as shown in the figure with various data points. With access to these various data points we are able to...

My question pertains to model trains. I use a magnet under my last car to activate computer commands via a reed switch. One locomotive has a speaker placed near the bottom and the magnet of the speaker activates the reed switch - which I don't want it to do. One thought to correct this is to...

I have done the hardware implementation using the planned schematic below. but somehow no sound seem to be able to play from the speaker except some noises. Anyone can help me check if something is wrong with DAC shematic...

Hey folks, I fancy myself as a bit of an audiophile. I love listening. I have a high-end audio interface on my computer with one set of outputs going to a pair of KRK studio monitors and a studio sub, and the other set of outputs going to some Klipsch Promedia general listening speakers...

Now I have an absolutely horrible question for someone with their MS in physics to be asking. Let's say you want to setup a 500hz tone out of a speaker. To do this, the driver in the speaker oscillates at 500hz. The thing I am wondering is what exactly causes something to be louder? Is it how...

Just out of interest I was wondering and couldn't work out... Why are (even high-end) speaker cables not coaxial? We always use a coaxial cable in the lab to get rid of the noise on our measurements. I figure that 50/75 ohm standard coax would create an impedance mismatch with the typically...

When you listen to music, you hear the beat, the melody, and the vocals all at once... and they all emanate from the same disk. How does all the noise sound so separate and distinct from one another regardless of whether its a rumbly bass or a piercing pitch? This confusion comes from my...

A speaker is generating waves in a gas that is closed in a tube. The tubes closed end is at x=0 and the speaker is at x=1. The motion of the membrane is given by s=s_0 \cdot sin(\omega t) How does the particle displacement vary with x and t? The wavelength is \lambdaI do not know how to solve...

Hi! I have made a small enclosure for my portable audio system. At first it was for a different speaker, but now I simply replaced all electronics and it still sounds good. But I want better. When I was making the box I didn't think about the air volume, just made a big box. So what's inside...

What do you guys make of this?? http://www.washingtontimes.com/news/2011/mar/17/nuclear-future-beyond-japan/ It says, and i quote: Which makes me feel at least partly safe posting this on PF. Any thoughts?

One of my favorite Republicans, and like President Obama, SOH Boehner is a shining example of the fact that power still resides with the People. He started his career woking in his father's bar. When his wife married him, he was a building custodian. Today, he is the third most poweful person in...

How to build this amplifier ? Need what component!

I've been studying the behaviour of speakers and headphones for my own interest. I was able to derive the differential equation governing the motion of the speaker itself, what I've had trouble doing is deriving the pressure created by the speaker. First the equation I've derived for...

Hi everyone, I am posting this thread just to find some information. I have a science project which try to make a compact directional sound for detecting movement. Now, the electronics which my group is developing is on a small PCB board (approximately 5x5 cm) I am wondering if...

Hi I am actually confused on the relation of standing waves and resonance. I know that standing waves are fromed when two waves of equal amplitude and frequency (one traveling and the other reflected or both traveling waves ) are superimposed in each other. This is the case when we also...

Hi all, I am trying to upgrade my car's audio system. There are kinds of free air loud speakers. I am not what they are. Anyone could explain and why they should be used in a car?

First, let me just say that I am very new to electrical engineering. It is something that I started teaching myself mere months ago. So, basically, it is probably best that you guys assume I know nothing. As I have expanded my knowledge, I have built some little things. For instance, an LED...

Surely, its maximum displacement A increases. But what about its speed? Increases, decreases, remains the same? And what about the number of the vibrations of its maximum displacement per sec? They increase or decrease or remain the same? This number is the frequency of the music f, or...

A speaker produces a sound with a frequency of 1000hz. How many waves are traveling in the air in front of the speaker? Does the number of waves decrease as one moves away from the speaker? Is there only the single 1000hz wave moving the air in front of the speaker? This is not a homework...

A block with a speaker bolted to it is connected to a spring having spring constant k= 20.0 N/m as in Figure P17.40. The total mass of the block and speaker is 5.00 kg, and the amplitude of this unit's motion is 0.500 m. (a) If the speaker emits sound waves of frequency 440 Hz, determine the...

Homework Statement Speaker 1 is positioned at the origin and speaker 2 is at the position (0, 4.00) meters. They emit identical sound waves of wavelength 1.55 m, in phase. If you stand on the x-axis at (x, 0) meters, what is the smallest positive value for x for which you experience complete...

I'm wondering how I could make an extremely small speaker (ideally the size of a stack of 3 quarters) that played a custom sound, like a 5-10 second music recording. In my dreamland the sound would be timed to repeat every hour or so, and the speaker would contain its own power source. The...

I saw THIS video and THIS OTHER ONE I was really quite surprised that such a thing was actually made to work. I'm curious how one could create an arc such as that, and then modulate it to match an audio signal. From my interpretation the extreme voltage causes an arc between the contacts...

Homework Statement For my physics coursework I am researching how multi driver speaker systems try to reproduce the full spectrum of sound, do you know any equations that will help me to describe frequency, and how ultra high and low frequencies can be reached? Regards, Matt Homework...

That certainly says a lot about where the direction the conservative movement is heading in. Ron paul seems to have gotten people my age thrilled and euthiasitic about the concepts of liberty . I am surprised that he beat out mitt romney and sarah palin? THoughts?

Can someone translate 'You are beautiful' and 'I want to kiss you' into Hindi, please? thanks in advance

Hi, My first post here...I have some physics background, but it was a while ago. I remember seeing an excellent demo on electromagnetics, using a magnet, coil, CD player, and the top of a cardboard box to make a speaker. I'd love to find a step-by-step so I can show this to a class of high...

1) Why might speaker boxes differ in shape? 2) Why might some speakers be bigger or heavier than others? 3) Why are speaker surfaces made of materials other than regular paper or styrofoam?

Why is it that a full range speaker is not able to deliver all frequencies at once with perfection as compared to the standard tweeder, midrange, woofer and optionally subwoofer arrangement?

Hi. I'm trying to measure the milliseconds of duration of output from a little piezo speaker that is on a circuit (a freezer control unit). I tried connecting an oscilloscope across its leads, but when I apply power, I hear this resonating noise which does not sound healthy. This is only when...

Hey guys, I'm not an Electrical Engineer, which is why I'm here asking for your help! I have a car audio system I am building and installing my self, and I have one specific question. I am planning on having a 60 watt (RMS), 2 ohm speaker powered by a 90 watt (RMS @ 2 ohms) amplifier, and I...

Homework Statement A 19.0 kg speaker is suspended 1.6m from the ceiling by two cables each 2.5m in length. the cables come to the top of the speaker and each cable forms and equal angle with the ceiling. Homework Equations i have no idea. i am completely lost. The Attempt at a...

I am quite confused how a speaker can produce two or more different frequencies at the same time ? Let's consider one instrument to be the thud of the kick drum Let the second instrument be a Shakuhachi flute. (From Enigma Sadeness) Let us have only one speaker( like in most of the...

I'm trying to find a good home for my puppy. and my neighbor is having a garage sale. I've made up signs in english, but most of the people stopping by only speak spanish. Can someone translate this into spanish for me? "Free Puppy. I found her yesterday and she's very young and very friendly...

I played the audio song on my 8 Ohm audio speaker. I used my Computer Audio Port to play the song. I played that song on my speaker, it worked perfectly, but when I invert the audio signal 180' out of phase, the voice generated was the same. That is to say, when the speaker used to contract, it...

Homework Statement https://tycho-s.phys.washington.edu/cgi/courses/shell/common/showme.pl?courses/phys123/spring08/homework/01b/twospeaker_INT/02.05.gif (if image doesn't show up...it is a right angle triangle with S1 at the right angle, 4m between it and O and 3m between S1 and S2) The...

Homework Statement A pair of speakers separatd by .700m are driven by the same oscillator at a frequency of 690Hz. An observer originally positioned at one of the speakers begins to walk along a line perpindicular to the line joining the speakers. How far mus the observer walk before...

Slashdot is reporting "James Randi Posts $1M Award On Speaker Cables" http://science.slashdot.org/science/07/10/04/1354224.shtml http://www.randi.org/jr/2007-09/092807reply.html#i4 http://gizmodo.com/gadgets/speaker-cables/7250-speaker-cables-turn-you-into-a-dancin-fool-302478.php...

Good day to all. I have some questions regarding speaker specifications: 1. What does RATED POWER of the speaker mean? 2. Why is the impedance of the speaker usually has a value of 4 ohms, 16 ohms etc, when speakers also contain inductors and capacitors in their drivers? 3. What is the...

What voltage do car speakers typical run at? Thank you for your time.

Does anyone know where I can find a flat tiny speaker, let's say for arguments sake roughly the size of a quarter, that can produce a reasonably loud audible tone? Thanks! Ted

I am looking for equations which would describe sound that a speaker produces. If I understood the principle how a speaker works correctly, there are a permanent magnet and an electromagnet. As alternate current flows trough a wire, the poles of electromagent constantly swich places. When...