With klaraT, every loudspeaker’s diaphragm can be monitored in real-time reducing and even eliminating limitations.


How it works:


By mapping the exact position of the speaker driver with every sound, klaraT technology using the Bendsensor®, calibrates, corrects and produces near-perfect sound with zero lag time. With subVo’s klaraT®, virtually any surface can become the diaphragm of a speaker, including television screens, computer monitors, smart tablets and phones.


With klaraT the airspace behind a speaker can be eliminated, thus reducing size and giving smart devices their slimmest design with the sound of the most expensive speaker in the world.


Distortion is eliminated. The physics of juggling perfect sound is gone. With an unbiased sound output, the frequency response is flattened and all sounds and music notes occur on time and with as close to perfect sound as you can find.


Bendsensor Technology and klaraT

Using the subVo® Bendsensor®, a unique screen-printed carbon-based sensor that changes in resistance when bent, forces and movements are monitored and tracked in real-time with little inductance or capacitance, one end of the sensor is attached to the moving diaphragm while the other is attached to a non-moving surface such as the frame or basket of the loudspeaker. The sensor can also be mounted on the top or underneath the diaphragm and because it is printed on polyester or polyimide substrates, the sensor can be die-cut to fit into any space needed for the monitoring of the diaphragm.


Sometimes confused with an FSR or Force Sensing Resistor, the Bendsensor® is single layer and immune to particles and fluids, uses a proprietary conditioning process, and is micro-thin—slipping into the smallest of spaces—unlike the FSR which has two to three layers of substrate.


Not sensitive to temperature, the Bendsensor® substrates are porous and improve the path of electrons through the carbon ink, lowering the baseline resistance and the sensitivity to bending. Although the sensor is sensitive to humidity, it does react in a predictable manner.


How subVo’s klaraT compares to the sound quality of today’s speakers.


Some speaker manufacturers use a secondary voice coil—one driven by the amplifier while the other is used to sense the velocity of the diaphragm. Others employ an accelerometer attached to the dust cap of the diaphragm. Both have their limitations including the inability to derive X position of the diaphragm without error. Both suffer delays due to reactive components, and while the secondary voice coil is heating up and distorting the sound, the frequency response of the accelerometer is severely limited by its sensor bandwidth and noise.  


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klaraT® DSP

klaraT® DSP is a System on Chip (SoC), that runs the klaraT® algorithm. The klaraT® algorithm performs the PID controller feedback loop, linearizes the Bend Sensor® response, and compensates for environmental conditions.


klaraT® Algorithms


Bend Sensor® Linearity

Depending on manufacturing tolerances and mechanical mounting of the Bend Sensor® it may not have a linear resistance to excursion transfer function. The klaraT® DSP can linearize the Bend Sensor® response.


Limit Calibration

The klaraT® DSP will check the speaker excursion limit, scaling the Bend Sensor® response curve as necessary. During this process the klaraT® DSP determines when the loudspeaker is approaching its limits. 


PID Feedback Control Loop

The klaraT® DSP self-tunes the proportional, integral and differential coefficients of the PID control loop. 


Voice Coil Temperature Estimation

The klaraT® DSP can also estimate the voice coil temperature while examining the ratio of the audio signal amplitude, as well as the Bend Sensor® signal amplitude.