Ole Wolff Elektronik A/S, Roedengvej 14, 4180 Soroe
sales@owolff.com, T: +45 5783 3830
24-11-2020

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Speaker system design
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Speaker system design

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Integrating speakers into end products and optimizing performance

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Very often smart speaker system designs are challenged by the industrial designers to be very small and with extreme form factors, and this can leave the acoustic design engineer in a very frustrating situation because audio performance normally will be compromised in this process.
However, there are also solutions for this can be accepted in the specific speaker system project.
Such a solution could be the design in of a passive radiator especially tuned to work together with the active loudspeaker as well as the available rear air volume inside the speaker system cabinet.
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Micro speaker system design

Maximizing performance in minimal space

Ole Wolff is specialized in not only the design and manufacture of high efficient Micro loudspeakers having maximum performance relative to the physical size and required form factor.
Ole Wolff is also dedicated to the design-in of our Micro Loudspeakers into our customer`s speaker box/device, which they are developing, for ending up having the most optimal sound quality possible.
Almost always, the interior of a speaker box or system needs to be taken into account, for giving the optimal acoustical tuning and thereby the most natural and life like sound reproduction.
This goes for the inner free air available in the speaker box as well as the design of the sound outlet structure in the speaker box or whichever device is being developed having a sound source build in.

Selecting the right micro speaker

Ole Wolff has a very large portfolio of Micro Loudspeakers designed for Micro Speaker Systems (please use selection guide on webpage), so very often we already from the beginning of a customer driven project can recommend a specific Micro Speaker to be perfectly doing the audio job.
However, if required, Ole Wolff also often join projects, where a new Micro Speaker has to be developed from scratch.
In such a case, there are of course requirements for a defined minimum quantity of speakers for the lifetime of the project as well as a slightly longer development time has to be accepted compared to when choosing an “off the shelf” product.
The reason for needing a new customized Micro Speaker can be requirements for an extreme physical form factor, very small certain dimensions, or the need for a specific electrical contacting method etc.
microspeakers
A selection of Ole Wolff micro speakers

Speaker box design

The Ole Wolff mechanical engineers work closely together with the acoustics team

For being able to offer the best customer support in the design phase of the Speaker Box or sound system, it is crucial to have a very tight and efficient cooperation between Acoustical and Mechanical engineers, who have a long experience in this kind of work.
This is exactly what Ole Wolff is capable of. Our Engineering team teams up with the engineering teams of the customer and exchanges CAD designs, simulation results until the performance target is reached.
Next stage is then to make prototypes, either as SLA or machined parts to be used in the following verification stage, where the performance is actually measured and matched to the simulation results.
This tight and straight forward way of working will guarantee our customers the shortest and most cost optimal path to the match of their target requirement specifications.
Speaker box design
A selection of prototypes of speaker boxes desiged by Ole Wolff designed to optimize perfomance in the limited space available
porting
The speaker placement can seriously affect the frequency reponse.

Passive radiators and bass reflex

Sometimes adding passive radiators or bass reflex can improve perfomance

The design-in of a passive radiator (also often named as a slave unit) in a Speaker System can improve the low frequency response performance, also referred to as the bass sound reproduction.
This technique uses the tuning of a resonator to have its resonance just below the resonance frequency of the active driver itself and thereby adding more acoustic sound pressure level in this region.
This tuning is controlled by the moving mass, the mechanical compliance, the piston area of the passive radiator and all in combination with the size of the air volume inside the speaker system.
Obviously, all acoustical power comes from the active driver, and therefore the driver will be stressed maximum having a very high diaphragm displacement/stroke at the tuned frequency.
Ole Wolff has the capability of designing the active drivers and passive radiator having the robustness needed for these designs.

Passive radiators and bass reflex
Ole Wolff uses a custom designed test rig to test and develop passive radiators

DSP Tuning and speaker protection

Tayloring the frequency response, maximizing bass while protecting the speakers from being overloaded.

Ole Wolff has the reputation of designing very high quality and robust loudspeakers having excellent reliability.
However, feeding our loudspeakers with carefully tailored electrical signal processing can further extend the audio performance without challenging the reliability and lifetime.
Knowing all the characteristics of the speakers allows for driving them to the very limit of maximum allowed voice coil temperature as well as maximum allowed stroke of the diaphragm.
There are so-called Smart Amps (amplifiers) on the market, which accept these loudspeaker characteristics to be programmed in, and giving the result of a very high sound reproduction quality at all sound pressure levels and at a very low distortion.
Ole Wolff supports our customers in this optimization process as a natural part of our service.

DSP Tuning and speaker protection
System tuning, bass management and speaker protection using TI Smart Amp™ technology

Verifying the performance

Measured respose as well as subjective impressions matter

Ole Wolff has the reputation of designing very high quality and robust loudspeakers having excellent reliability.
However, feeding our loudspeakers with carefully tailored electrical signal processing can further extend the audio performance without challenging the reliability and lifetime.
Knowing all the characteristics of the speakers allows for driving them to the very limit of maximum allowed voice coil temperature as well as maximum allowed stroke of the diaphragm.
There are so-called Smart Amps (amplifiers) on the market, which accept these loudspeaker characteristics to be programmed in, and giving the result of a very high sound reproduction quality at all sound pressure levels and at a very low distortion.
Ole Wolff supports our customers in this optimization process as a natural part of our service.

Verifying the performance
Testing the performance in the Ole Wolff anechoic chamber