Beijing Silk Road Enterprise Management Services Co.,LTD
| Payment Terms | T/T, Western Union,Paypal |
| Supply Ability | 300000pcs per month |
| Delivery Time | 2~4weeks |
| Packaging Details | Neutral packaging/ Customise |
| Material | metal |
| SPL | 87±3dB |
| Color | black |
| Plug | Customize |
| Function | Speaker |
| Waterproof | Front side waterproof |
| Brand Name | Yuesonic |
| Model Number | YD50-4R |
| Certification | CE |
| Place of Origin | China |
View Detail Information
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Product Specification
| Payment Terms | T/T, Western Union,Paypal | Supply Ability | 300000pcs per month |
| Delivery Time | 2~4weeks | Packaging Details | Neutral packaging/ Customise |
| Material | metal | SPL | 87±3dB |
| Color | black | Plug | Customize |
| Function | Speaker | Waterproof | Front side waterproof |
| Brand Name | Yuesonic | Model Number | YD50-4R |
| Certification | CE | Place of Origin | China |
| High Light | raw frame speakers ，car woofer speaker | ||
3W 8ohm small round thin black speaker door bell ringing music player audio driver
1. Specifications
| Sound pressure | 79±2(A)AT 1m/1w |
| VOICE COLL IMP | 8Ω |
| RESONANT FREQ | 230±20% HZ |
| Temperature | -20°C ~ 60°C |
| RATED POWER | 2W |
| MAX POWER | 3W |
| Weight | 12.8g |
2. Description
|
NO. |
ITEM |
SPECIFICATION |
TESTING CONDITION |
| 1 |
NOMINAL SIZE | Ф50 MM | |
| 2 |
VOICE COLL IMP | 8Ω ±15% | AT 1.2KHz 1V |
| 3 |
RESONANT FREQ | Fo 580±20% HZ | AT 1.0V |
| 4 |
OUTPUT S.P.L | MEAN VALUE AT 0.8,1.0,1.2,1.5 KHz 87±2dB | AT 0.5m /1w MEASUREMENT |
| 5 |
FREQ RESPONSE | fo ～ 10 K Hz -10dB |
-10dB |
| 6 |
RATED POWER | 2.0 W | |
| 7 |
MAX POWER | 3.0 W | |
| 8 |
OPEARTION |
MUST BE NORMAL | PROGRAM SOURCE 2.0 W |
| 9 |
NOISE |
MUST BE NORMAL | SINE WAVE 4.0 V |
| 10 |
HEAT TEST | AFTER TEST MEET ITEM 8,9 | 55± 2℃ 16 HOURS |
| 11 |
HUMIDITY TEST | AFTER TEST MEET ITEM 8,9 | 40±2℃ 90～95%RH 48 HOURS |
| 12 |
LOAD TEST | AFTER TEST MEET ITEM 8,9 | 2.0 W 100 HOURS |
| 13 |
MAGNET | Ф12.5X1.5 NdFeB MATERIAL SIZE | |
| 14 |
TOTAL FLUX | MAX WELL | |
| 15 |
POLARIZATION | When a positive DC current is applied to the terminal marked(+),diaphragm shall move forward | |
| 16 |
NET WEIGHT | 12.8g | |
3. Applications
The first experimental moving-coil (also called dynamic) loudspeaker was invented by Oliver Lodge in 1898. The first practical moving-coil loudspeakers were manufactured by Danish engineer Peter L. Jensen and Edwin Pridham in 1915, in Napa, California.Like previous loudspeakers these used horns to amplify the sound produced by a small diaphragm. Jensen was denied patents. Being unsuccessful in selling their product to telephone companies, in 1915 they changed their target market to radios and public address systems, and named their product Magnavox. Jensen was, for years after the invention of the loudspeaker, a part owner of The Magnavox Company.
The moving-coil principle commonly used today in speakers was patented in 1924 by Chester W. Rice and Edward W. Kellogg. The key difference between previous attempts and the patent by Rice and Kellogg is the adjustment of mechanical parameters so that the fundamental resonance of the moving system is below the frequency where the cone's radiation Impedance becomes uniform. About this same period, Walter H. Schottky invented the first ribbon loudspeaker together with Dr. Erwin Gerlach.
These first loudspeakers used electromagnets, because large, powerful permanent magnets were generally not available at a reasonable price. The coil of an electromagnet, called a field coil, was energized by current through a second pair of connections to the driver. This winding usually served a dual role, acting also as a choke coil, filtering the power supply of the amplifier that the loudspeaker was connected to. AC ripple in the current was attenuated by the action of passing through the choke coil. However, AC line frequencies tended to modulate the audio signal going to the voice coil and added to the audible hum. In 1930 Jensen introduced the first commercial fixed-magnet loudspeaker; however, the large, heavy iron magnets of the day were impractical and field-coil speakers remained predominant until the widespread availability of lightweight alnico magnets after World War II.
4. Competitive Advantage
5. Information
| Place of Origin: | China |
| Brand Name: | Yuesonic |
| Certification: | CE/RoHS/SGS |
| Model Number: | YD78-1N |
6. Custom properties
| Product Name: | Speaker | Application: | Outdoor |
| Weight: | 257g | Sound: | HIFI |
| Material: | Metal | Power: | 15W |
| Standard: | CE/ROHS/SGS | Type: | Line array |
7. Product commercial terms
| Minimum Order Quantity: | 2000pcs |
| Price: | negotiation |
| Packaging Details: | T/T or western Union |
| Delivery Time: | 3,0000pcs per month |
| Payment Terms: | 14~28 working days after received your payment |
| Supply Ability: | Packed in box firstly,and then reinforced with neutral packaging for outer packing |
Company Details
Business Type:
Manufacturer,Exporter,Seller
Year Established:
2009
Total Annual:
5,000,000-10,000,000
Employee Number:
100~600
Ecer Certification：
Verified Supplier
Beijing Silk Road Enterprise Management Services Co.,LTD is a professional company focus on Car Parts business. Beijing Silk Road also will responsible with exporting and logistic business. Founded in 2009, Our company is a leading manufacturer and supplier of Car Spare Parts in China. ... Beijing Silk Road Enterprise Management Services Co.,LTD is a professional company focus on Car Parts business. Beijing Silk Road also will responsible with exporting and logistic business. Founded in 2009, Our company is a leading manufacturer and supplier of Car Spare Parts in China. ...
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