Loudspeaker, Headsets, Woofer Magnets
A loudspeaker is an electroacoustic transducer which converts an electrical audio signal into a corresponding sound. Magnets are widely used for loudspeaker/headsets/woofer , it included AlNICO , NdFEB and Ferrite magnets and so on.
Typical speaker NdFeB magnets for Loudspeaker/headsets/Woofer :
Typical speaker Ferrite ring magnets for Loudspeaker/Woofer :
D18 × d6 × 24mm
D21 × d7 × 32mm
D25 × d8 × 50mm
D30 × d10 × 60mm
D35 × d18 × (6-8)mm
D40 × d19 × (6-10)mm
D45 × d19 × (6-10)mm
D50 × d24 × (6-12)mm
D55 × d26 × (6-12)mm
D60 × d30 × (8-16)mm
D65 × d32 × (6-16)mm
D70 × d45 × (8-18)mm
D72 × d32 × (8-18)mm
D75 × d40 × (10-15)mm
D80 × d40 × (10-20)mm
D85 × d45 × (8-20)mm
D90 × d35 × (10-18)mm
D100 × d50 × (12-20)mm
D110 × d60 × (15-20)mm
D120 × d45 × (12.5-20)mm
D135 × d60 × (15-20)mm
D140 × d65 × (12.5-20)mm
D145 × d70 × (20-24)mm
D156 × d60 × (20-25)mm
D165 × d86.4 × (15-25)mm
D180 × d80 × (20-25)mm
D180 × d95 × (20-25)mm
D220 × d110 × (20-25)mm
Rated impedance 100ohm
Rated Power 0.1Watt
Max Power 0.25Watt
Sound Pressure Level 95dB ± 3dB
FO(HZ) 900Hz ± 20%
Packing Standard exporting carton for Multimedia Speaker
Production L/T 15-20 working days after 30% deposit
Delivery Port FOB Shenzhen, FOB Hongkong
By Express, like DHL, UPS, FEDEX, TNT
Payment Term T/T,Paypal,L/C,D/A,D/P,Western Union,MoneyGram
Sample Free sample
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. (This sounds like a good science experiment…)
What is Sound?
Sound is a vibration in the air. Waves of changing pressure in the air move your eardrum, allowing you to hear sound. Just like ripples in a lake where you throw a stone, ripples in the air are what makes sound.
For a simple example, consider banging a drum. After hitting the drum, the surface vibrates back and forth, pushing the air in waves. When those sounds hit our ear, we hear noise.
If the vibration is slow, we hear a low pitch. If the vibration is fast, we hear a higher pitch.
So, to make a speaker all we have to do is drive a surface (often a cone shape) back and forth. The movement of the speaker makes waves of pressure in the air — sound!
Motive Force – What Drives a Speaker?
A pair of magnets can stick together. We’re going to use this basic property of magnets to move our speaker. We use one permanent magnet and one electromagnet. Injection Ferrite Multipole Magnetic Ring for Sweeping Machine
Permanent Magnet – An object that produces a persistent magnetic field. Neodymium magnets are a great example.
Electromagnet – An electric current running through a coil of insulated wire generates a magnetic field. While the current flows, it acts much like a permanent magnet. If no current is flowing, it stops acting like a magnet. Hot-Pressed Bonded NdFeB Ring Magnets for Motors
The permanent magnet is always on. The electromagnet we turn on and off by running current through it, or not.
For our speaker construction, we attach a coil of wire (the electromagnet) to the back of a movable surface. We used Magnet Wire, which is commonly used in everything from speakers to transformers. It has a very thin insulating coating, which lets you get many turns in a small area. UPDATE: We offer this wire in our Magnet Wire section! Ferrite Plastic Permanent Magnet with Overmolded Plastic Material
We arbitrarily used about 12 feet of wire in these examples, wound into a coil of roughly 30-35 turns. We wrapped the wire around a piece of 1″ diameter PVC pipe, end then slid the coil off the end of the pipe. The result is a coil just over 1″ in diameter. Tiny NdFeB Magnets in Smartphones and Personal Electronics
Next, we place a permanent magnet nearby. While no current flows through the coil, nothing happens. If we attach a battery to the coil, current flows, and the coil is attracted to the permanent neodymium magnet. Run the current in the opposite direction, and the coil is repelled away from the magnet. Plastic Injection Ferrite Encoder Sensor Magnets