Products
Mylar Speakers (MD)
Speaker/Receiver Amphibious (MR)
Dynamoelectric Receivers (SD)
 Oblong Speakers (YT)
 

Nomenclature of Model Number
Product items are strictly sorted and catalogued by their model numbers, which are formatted as 1234-56-7, where codes from 1 to 7 are defined and described as follows.
 
1. Alphabetic String for the Categories
  ED: Earphone Speakers
MD: Mylar Speakers
MR: Speaker/Receiver Amphibious
SD: Dynamoelectric Receivers
YC: Concave Speakers
YD: Cone Speakers
YT: Oblong Speakers
 
2. Digital String for the Nominal Dimensions of the Frame in Unit of Millimeter
  ，The diameter of the frame for the items circular.
，The smaller dimension or the width of the frame for the items oblong.

3. One Letter for the Frame and Magnet Structures
  ，A: High-profile internal-magnet metal frame
，B: Low-profile internal-magnet metal frame
，D: Duplex-magnet metal frame		 ，F: External-magnet metal frame
，N: Low-profile internal-magnet plastic frame
，S: External-magnet plastic frame

4. Digit String for the Bigger Dimensions of the Frame Oblong in Unit of Millimeter
  ，Null for the items circular.
，The bigger dimension or the length of the frame for the items oblong

5. One Letter for the Diaphragm Materials
  C: Fabric E: PET I: PEI K: Paper M: Metal N: PEN  
X: Complex diaphragm with surrounding of different material

6. Digital String for the Nominal Impedance in Ohms.

7. Version String
NORMAL EXAMPLES:

ED27N-E32: Earphone speaker with low-profile plastic frame of diameter 27mm, PET diaphragm, 32 ohms

MD10B-E32: Mylar speaker with low-profile metal frame of diameter 10mm, PET diaphragm, 32 ohms

MR10B17-I64: Speaker/Receiver amphibious oblong with low-profile metal frame of dimensions (W*L) 10*17mm, PEI diaphragm, 32 ohms

SD13B-E150: Receiver with low-profile metal frame of diameter 13mm, PET diaphragm, 150 ohms

  

YD45F-X8: Cone speaker with external-magnet metal frame of diameter 45mm, complex cone, 8 ohms

YC57A-X4: Concave speaker with high-profile metal frame of diameter 57mm, complex cone, 4 ohms

YT28N40-C32: Oblong speaker with internal-magnet plastic frame of dimensions (W*L) 20*35mm, fabric diaphragm, 32 ohms
Nomenclature of Model Number