SELTECH SOD20722X4CVT Instruction Manual

Recommended design guideline

for micro speakers

SELTECH –CONFIDENTIAL

Common Application Design Guidelines

Back volume

… 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

Back volume

… to have a well defined acoustical environment behind the speaker

Well defined acoustical performance

… 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

… Why a closed back volume?

Back volume

Using PCB as box-cover

Directly contacting to PCB

Create closed box

Contacting with flex-print

Create closed box

Contacting with contact pin

… How to connect to the speaker?

Back volume

Create closed box

Contacting with contact spring

Reverse application

Directly contacting to PCB

… How to connect to the speaker?

back volume

Sound port at rear side of the speaker

Back volume

Min. wall thickness to avoid wall resonating (depends on material)

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.

… Mechanical robustness

Back volume

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

Back venting of RA11x15

Back volume

Speaker surounded on three sides by walls will

influence resonance frequency and sensitivity.

Additional acoustic load will reduce performance

compared to a free scenario

Acoustic load at the rear side of speaker

Back volume

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

Acoustical influence

Back volume

Leaks can cause damage to the speaker by exceeding maximum membrane excursion

Acoustical influence

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