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US5450499A - Audio speaker for use in an external …
https://patents.google.com/patent/US5450499A/en
An electrodynamic loudspeaker for use in a magnetic field generated by an external source, the speaker comprising an acoustic diaphragm attachable to a non-magnetic speaker frame at one end thereof; and a voice coil wound on a bobbin attached to the opposite end thereof, the speaker frame being adapted for mounting the speaker within the external field, the speaker further …
Audio Speakers - K&J Magnetics
https://www.kjmagnetics.com/blog.asp?p=speakers
Audio Speakers. Every audio speaker has a magnet in it. From subwoofers to iPod headphones, magnets provide the motive force that makes speakers move. Read on to understand the basics of speaker operation and how to make one with neodymium magnets. ... Permanent Magnet - An object that produces a persistent magnetic field. Neodymium magnets are ...
Making Sound: Magnets - How Speakers Work | HowStuffWorks
https://electronics.howstuffworks.com/speaker6.htm
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. These two magnets -- the electromagnet and the ...
Loudspeakers: A Look at Magnets
https://www.stetron.com/loudspeakers-magnet/
Most ceramic magnet structures in loudspeakers are open magnetic circuits, leading to significant leakage of magnetic fields in the region around the magnet. Historically, this was a significant challenge for audio-visual systems as this leakage led to image distortion in TVs. With the advent of LCD and LED flat panel televisions, the challenge ...
Line Magnetic Audio LM 755i Field Coil Speaker Review - …
https://www.dagogo.com/line-magnetic-audio-lm-755i-field-coil-speaker-review/
Line Magnetic Audio reproduces this speaker and builds on its virtues by using a field coil topology instead of a fixed magnet. Their field coil drivers have a power supply that uses 300Bs to power the magnets. The result is the LMA 755i which is 92dB efficient at 8 ohms. The 755A drivers are placed in a cabinet built by LMA; the cabinets are ...
Field Coil Speakers everything you need to know
https://www.phantom-audio.com/field-coil-speakers-field-coil-drivers/
The History of Field Coil Speakers. The first field coils could be found in electrodynamic loudspeakers during the early years of the 20 th century. Around 1920, permanent magnets that had the necessary strength were simply too heavy, too big and, most importantly, too costly.
Speaker's magnetic field and pacemaker - High-End Audio ...
https://forum.audiogon.com/discussions/speaker-s-magnetic-field-and-pacemaker
PM member jadem6 or write to him through his cable company Jade Audio. He has a left ventricular assist device which I imagine is also v sensitive to magnetic fields. I know he has continued to remain active designing and building i/cs and speaker cables so I imagine he knows the ins and outs of this issue.
Line Magnetic LM-3 Loudspeaker - Field Coil Version ...
https://www.phantom-audio.com/product/line-magnetic-lm-3-loudspeaker-field-coil-version/
LM-3 Loudspeaker Field Coil Version Line Magnetic’s flagship horn speaker, the LM-3 follows the design concept of the classic Western Electric Horn system. Line Magnetic Audio is a brand of High end products founded in 2005. Now it has become well known with its series reproduction of music and regarded as a forerunner in presenting innovative products …
PS Audio Aims High With Its First-Ever Loudspeaker - The ...
https://www.audioholics.com/tower-speaker-reviews/ps-audio-aspen-fr30
PS Audio has finally introduced the company’s first-ever loudspeaker, the aspen FR30 ($28,499/pair). The FR30 is a 3-way tower speaker that combines planar magnetic tweeters and midrange drivers with dynamic woofers (4 active 8“ drivers and 4 …
AUDIO engineering society
https://www.aes.org/aeshc/pdf/how.the.aes.began/preisman_loudspeaker-damping.pdf
the magnetic lines, and generates a cou?ter electromotive force, c.e.m.f. The action is exactly similar to that of the rotating armature a d.c. motor -the armature generates a c.e.m.f. by its rotation in the magnetic field. Con- Fig. 2. Mechanical characteristics of speaker as seen from voice-coil terminals.
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