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SELTECH SOD20722X4CVT Design Manualline
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SELTECH SOD20722X4CVT Design Manualline

Recommended design guideline for micro speakers
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R e c o m m e n d e d d e s i g n g u i d e l i n e
f o r m i c r o s p e a k e r s
S E LT E C H – C O N F I D E N T I A L
© 2020 SELTECH - All rights reserved

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Summary of Contents for SELTECH SOD20722X4CVT

  • Page 1 S E LT E C H – C O N F I D E N T I A L © 2020 SELTECH - All rights reserved...
  • Page 2  … why a closed back volume?  … how to connect to the speaker?  … mechanical robustness  … acoustical influence  Sound Port  … opening size vs. Bandwidth  … damping/acoustic load  … turbulence/noise © 2020 SELTECH - All rights reserved...
  • Page 3  … to be able to adjust the resonance frequency of the system  Resonance frequency range is the most efficient range of the speaker  … to avoid acoustical short circuit  Speaker for closed box design needed © 2020 SELTECH - All rights reserved...
  • Page 4 … How to connect to the speaker?  Using PCB as box-cover  Directly contacting to PCB  Create closed box  Contacting with flex-print  Create closed box  Contacting with contact pin © 2020 SELTECH - All rights reserved...
  • Page 5 … How to connect to the speaker?  Create closed box  Contacting with contact spring back volume  Reverse application  Directly contacting to PCB Sound port at rear side of the speaker © 2020 SELTECH - All rights reserved...

  • Page 6: Mechanical Robustness

     Avoid « wall-to-wall-design » (e.g. antenna module)  Vibrations can cause rattling noise  Use « sandwich » for applying the speaker (foam-gasket, speaker, hard support at rear side)  No heat-radiating components inside the back volume  Etc. © 2020 SELTECH - All rights reserved...
  • Page 7  It is possible to put the RA completely down on a PCB or module housing  Venting to the back is provided by 4 venting holes and slits  All 4 holes should lead to a common, closed back volume © 2020 SELTECH - All rights reserved...
  • Page 8 Back volume Acoustic load at the rear side of speaker Speaker surounded on three sides by walls will influence resonance frequency and sensitivity. Additional acoustic load will reduce performance compared to a free scenario © 2020 SELTECH - All rights reserved...
  • Page 9 Back volume Acoustical influence  Channels connecting parts of the back volume can cause peaks in frequency response  Shape of volume: high aspect ratio volume spaces do not constitute effective volume © 2020 SELTECH - All rights reserved...
  • Page 10 Back volume Acoustical influence  Leaks can cause damage to the speaker by exceeding maximum membrane excursion © 2020 SELTECH - All rights reserved...

  • Page 11: Sound Port

    Sound Port Opening size vs. Bandwidth © 2020 SELTECH - All rights reserved...
  • Page 12 Distance from top of speaker to housing should be at least 0,5mm to avoid audible turbulence. Dimensions: V1 = V2 V1 + V2 = 0,8ccm Tube 1: (5x1) x 5 mm Tube 2: (5x0.5) x 5 mm © 2020 SELTECH - All rights reserved...
  • Page 13 Sound Port Turbulence/noise Possible reasons:  Sound port openings too small  Front volume too small  Sharp edges in sound port  Damping mesh on sound port too tight © 2020 SELTECH - All rights reserved...
  • Page 14 T H A N K S ! © 2020 SELTECH - All rights reserved...

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