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Electromagnetic speaker user

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WATCH RELATED VIDEO: Building an electromagnetic speaker

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Gallery New media New comments Search media. Log in Register. Search titles only. Search Advanced search…. Log in. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Electromagnetic vs magnetic speakers. Thread starter Asere Start date Jul 4, Asere Senior Member. Thread Starter. Are electromagnetic speakers better then magnet speakers? What are pros and cons of each? DonH57 Member. I am not sure what you are asking. Hand waving follows; look up Maxwell's equations.

There are also numerous online tutorials with pictures and much better explanations but hopefully this will get you started. When you pass current through a wire, a magnetic field is automatically generated at right angles to the current flow. That is the often-mentioned EM electromagnetic field. Conventional speakers use a coil of wire around a permanent magnet.

Many of us made an electromagnet from a nail and coil of wire, or made a little electric motor. Wrap the wire around a magnet, and as the signal current goes back and forth reverse polarity it will create a magnetic force that works with and against the magnet. Send the current one way, and the magnetic fields attract; the other way, and they oppose, so as the signal varies you get "pushing" and "pulling" forces.

Attach the wire voice coil to a cone of some material, and then when you apply signal current e. The cone in turn creates vibrations in the air -- sound. Planer-dynamic speakers like Magnepans basically take the voice coil and turn it into long strips of wire going up and down a large lightweight moving panel the cone gets flattened and spread out.

The magnet becomes strips of magnets on a fixed panel behind usually the moving panel. Now, when you apply signal to the wires, again a magnetic field is created that pushes against the strips of magnets, and the whole panel moves back and forth.

This may provide lower distortion, since the entire panel "cone" area is driven, but also much less movement since the moving panel has to be close to the fixed panel for the signal current to generate enough magnetic field to push against the magnets and move the panel.

In their case, two voltage fields are generated; a DC static, non-moving field on a light, thin conductive diaphragm panel. Panels on either side are driven through a step-up transformer to create the high voltage required by the audio signal. Now there are no magnets, but opposite charges voltages attract, and similar charges repel, so again there are forces that move the diaphragm back and forth.

Electrical voltage fields instead of magnetic fields, but the same general idea. Again the light diaphragm is driven over its entire area, and covers essentially the entire audio band with a single driver, so can have lower distortion but less dynamic range than a conventional driver. Planar speakers Maggies or ESLs radiate equally out the front and rear so the back wave can cause a more "spacious" sound but also lead to cancellations when the back wave combines with the front, causing ripples in the frequency response comb filter effects.

Conventional speakers radiate more-or-less in all directions so in general "fill the room" more but are also more sensitive to reflections from walls, ceiling, and floor that can cause frequency ripples in the sound. They do tend to play louder and provide more bass than planar speakers. HTH - Don. Last edited: Jul 4, Asere said:. The OP may be referring to the old style electromagnetic speaker.

If so, I have no information regarding the pros and cons of this style driver beyond the higher cost to manufacture and operate it. The driver uses a field coil instead of the permanent magnet. I don't know if this style driver is now being used by anyone. The Diyaudio. Thank you guys for explaining. I wasn't specific with my question but yes I was asking how much better sounding one is vs the other. I already like the fact that with esl the reflection is less.

I have a huge window in my family room. Learning about esl is interesting. I may sound dumb but when I first saw the Martin Logan's ESL I thought the design was neat but never put thought on why they looked liked that. Especially when you can't see the tweeters and midrange but now I know why. This design has my attention. Last edited: Jul 5, Any dipole speaker suffers from or is influenced by the back wave.

Moving it further from the wall behind drops the frequency at which fundamental interactions occur. I have never cared for the comb filtering effect that messes up the image so have always damped the wall behind; that allows placement closer to the wall and a more stable stereo image over frequency.

You does lose some of the "spaciousness" in the sound; now it must come the recording and not your room. Martin Logan and other ESLs with curved radiating surfaces "engage" the room more to provide a more "spacious" sound at the cost of imaging and greater sensitivity to the side walls a pro or co depending upon how you like the sound.

Flat panels tend to have a narrower "sweet spot" though some designs e. Quad use techniques to make the panels behave more like a conventional point source. Many Magnepan models dip below 3 ohms due to the ribbon tweeter but the impedance remains primarily resistive and so is a fairly easy, if low, load. Some ESLs Martin Logan among them dip below 1 ohm at very high frequencies; they get away with it because the energy and thus power required and such high frequencies is low so most amplifiers tolerate the load.

Magnepans are pretty low sensitivity. ESLs are all over the map, with some comparable to or lower than Maggies, and some considerably more sensitive.

By and large panels do not offer the sensitivity of conventional designs and thus require more power typically 2x to 4x the power to pay as loud. Fortunately most of us are using far less average power than we think, though also underestimate the power need for peaks. Planar speakers generally require a subwoofer to provide sufficient low-frequency response and dynamic range.

I am a subwoofer advocate for all the usual reasons so use them with any speaker. Better to offload the deep bass from the main speakers and their amps and place the subs where they best flatten the in-room response, which is rarely the same place you want the mains for best imaging and such. I've loved various panels for decades, though recently past couple of years returned to conventional speakers, retiring my vintage MG-IIIa Magnepans and surround-sound Maggie setup.

I do have subs. DonH57 said:. Sonnie Senior Admin Staff member. I connected them, but that's about it. The ESL's are tuned near perfect for the room, so not a fair comparison. Hopefully I'll get a chance to do some comparisons at some point in time. AJ Soundfield Member. One post, 4 replies??? Wow, original post gone Last edited: Jul 7, Grayson Dere Moderator Staff member. I remember many years back demo'ing a pair of Quad ESL They had an phenomenal ability of reproducing acoustic instruments.

The shop had speakers ranging from top tier Focals to mega-buck Wilsons. None of them could touch the Quads in the acoustic instrument realm. I will be using them in a separate room for only Vinyl listening. Arrives Friday and can't wait. Let us know your thoughts :. With the lead time from Magnepan on new LRS's, you must have found a deal on used.

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This speaker uses dancing ferrofluid to visualize music

Ads are not permitted. Electromagnetic Speaker by Art » Dec Fri 13, am Hi Guys, I have an 80 year old electromagnetic field coil speaker I'm not too interested in fixing. If you saw it you might understand. Some insects made a home in it with little nests and everything Is it ok to replace it with a modern speaker, and a choke that is located somewhere else?

When one of the magnets (either the electromagnet or the permanent Use fine grit sandpaper to strip the insulation off about 2 inches of.

Why And How Do Speakers Use Magnets & Electromagnetism?


Electromagnetic Speakers. What are your opinions about electromagnetic speakers about quality of the sound? This kind of speaker it can be used in active box. Another interesting potential advantage is the posibility to modulate the magnetic field to improve some parameters. Find More Posts by djdan. Re: Electromagnetic Speakers. Thank you for answere Kelticwizard! Activ Box means a loudspeaker cabinet with power amplifier inside and power supply , wich means that is easy to supply the speaker field coil , too. Only advantage for speaker with permanent magnet is the absence of the power supply for the magnetic field coil.

How does electromagnetic induction work in a large audio speaker?

electromagnetic speaker user

Why and how do speakers use magnets? Speakers are transducers of energy that convert electrical energy audio signals into mechanical wave energy sound waves. Many speaker drivers utilize electromagnetism to turn the AC voltage of the audio signal into diaphragm movement within a magnetic field to produce sound. Magnets are a crucial component in the design of most loudspeakers because most speakers rely on electromagnetism to act effectively as transducers. Without magnets, many loudspeaker designs would be impossible.

Inductance is used in the operation of many modern devices, such as speakers, memory, seismographs and GRCIs.

Electromagnetic vs magnetic speakers


A loudspeaker takes an electronic signal and turns it back into sound. How does a speaker reproduce sound from an electrical signal? We know from the previous chapter that the current flow in a coil of wire will produce a magnetic field. This electromagnet will attract or repel other magnets as if it were an ordinary magnet. One difference, however, is that we can easily reverse the polarity of the electromagnet by changing the direction of current flow.

How a speaker works

Introduction Do you like to listen to music? Have you ever wondered how a TV, computer or phone turns music into sound that your ears can hear? In this project you will build your own speaker from household materials and find out how speakers convert electrical signals into sound. Background Sounds, such as songs or the audio track on a movie, can be stored as an electronic file. The data in the file shows how the loudness and pitch of the sound changes over time.

Headphones, which contain small loudspeakers, use the reverse effect to microphones - the motor effect. In these devices, variations in an electric current.

17.1.4: Speakers

In everyday life, we use magnets in a variety of ways, from holding notes on a refrigerator to securely locking a safe or a cabinet door. Electromagnets are especially useful because the magnetic field can be controlled by turning an electric current on or off. When an electromagnet is placed next to another magnet, the attraction and repulsion between the two can cause movement or vibrations.

Please be aware of this before debugging further. Every audio speaker uses permanent magnets whether the speaker is in your car, in your stereo, your earphones or your smartphone. Permanent magnets provide the force that makes the component in the speaker that creates the sound, move. Sound is created when an object vibrates i. The vibration or movement causes air molecules to move resulting in waves of varying pressure known as sound waves.

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By: Tom Harris. When the electrical current flowing through the voice coil changes direction, the coil's polar orientation reverses. This changes the magnetic forces between the voice coil and the permanent magnet , moving the coil and attached diaphragm back and forth. So how does the fluctuation make the speaker coil move back and forth? The electromagnet is positioned in a constant magnetic field created by a permanent magnet.

Speakers of this size can consume from 0. Amplifiers use transistors to allow a weak signal to depict the form of a much stronger signal. In this way, the amplifier takes in a signal of a certain frequency and amplitude and puts out a signal with the same frequency, but much larger amplitude.




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  1. Waldron

    Magnificent idea and it is duly

  2. Fesar

    I congratulate you were simply visited with the brilliant idea

  3. Tzadok

    I can't take part in the discussion right now - I'm very busy. But soon I will definitely write what I think.