This document provides specifications for an EC31S09VN4 loudspeaker membrane basket assembly. Key specifications include: 1. The assembly uses a neodymium magnet that is 18.5mm thick and has a diameter of 31mm. 2. It has an impedance of 4 ohms, a power rating of 3.5 watts, and a resonant frequency of 250Hz. 3. Additional specifications cover dimensions, sensitivity, frequency response, total harmonic distortion, storage temperature, polarity, and testing results for rub and buzz, insulation resistance, temperature ranges, and humidity.

1. TYPE GASKET MEMBRANE BASKET WEIGHT
Material Magnet Size (Round)
NdFeB Ø 18.5x2.6mm
ITEM SPECIFICATIONS TEST CONDITIONS
1 Dimensions per mechanical Drawings
2 Impedance
3 Nominal Power
4 Max Power
5 Resonant Frequency 1.0V
6 Sensitivity (S.P.L.) 1W/1m, Average 250/10KHz
7 Frequency Response
8 THD
9 Storage Temperature -25°C to +55°C
10 Polarity Membrane move forward when positive DC is applied to the '+' terminal
ITEM TEST TEST CONDITIONS RESULT
11 Rub & Buzz No Buzzes or Rattles.
12 High Voltage Resistance Must be normal
13 Insulation Resistance > 1MW
14 Load
15 High Temp.
16 Low Temp.
17 Humidity
Part n°
EC31S09VN4
REV DATE SHEET
Property of Seltech. Specifications subject to change without notice. www.seltech-international.com 0.2 15/06/2016 1 of 1 Yes
REMARKS
RoHS Compliance
PACKAGING
Carton size:
5 Watts
250Hz ±20%
77dB ±2dB
Qty/Carton:
Gross Weight:
Measured on axis at a distance of 1m with 1W input power
+40±2°C ambient and 90-95%RH for 96h
After 1 hour of rest at room ambient
conditions, speakers must meet specs items 2,
5, 6.
guaranteed range for transportation & storage
100VDC between terminals and frame.
Pink Noise at 1.5W rated power for 100h
+55±2°C for 16h (random 20%-50%RH)
-25±3°C for 2h (random 20%-50%RH)
MAIN APPLICATION
Telecom and audio
3.2V (speaker frequency range)
VALUES
Ø31mm
4Ω ±15%
3.5 Watts
MAGNET
31mm
250Hz to 20KHz
SPECIFICATIONS
265mm*253mm*115mm
180 pcs/carton
100VAC / 1mn between terminals and frame.
-
Alu with
foam edge
ABS
Mechanical Drawings (in mm)
Typical Frequency Response