Ole Wolff Elektronik A/S, Roedengvej 14, 4180 Soroe
sales@owolff.com, T: +45 5783 3830
12-08-2020

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Speaker system design and tuning

Getting impressive results from small enclosures

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 sacrificed 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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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_rad
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.



TI
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.


owac
Testing the performance in the Ole Wolff anechoic chamber