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Nuvoton releases a world’s first smart amplifier with integrated Klippel Control Sound technology based on a nonlinear speaker control algorithm

San Jose, Calif. - 2020/10/20 - Nuvoton Technology Corp., a leading worldwide provider of consumer-electronics and computer ICs, today announced a new mono smart amplifier device, NAU83G10 and NAU83G20, with integrated Klippel Controlled Sound (KCS) technology from Klippel GmbH. 

Loudspeakers are highly nonlinear and time-variant systems. Signal distortion, heating, aging, climate and other external influences limit the maximum level and the quality of the reproduced sound.  Compared to a conventional smart amplifier devices based on a linear speaker model, the KCS algorithm is based on an adaptive & nonlinear speaker control model, which can improve the speaker performance and the sound quality greatly by offering mechanical & thermal protection, automatic system alignment, active compensation of transducer nonlinearities, and active stabilization of the voice coil rest position.  The main benefits of this new technique allow the transducer to operate the wider speaker displacement range without damaging the speaker and to improve the sound quality and AEC barge-in performance by reducing speaker distortions. 

“We are very excited to be working with Klippel on creating these new class of smart amp devices, which can deliver maximum output at the greater sound quality from smaller speakers, offer precise speaker protection, provide a real-time speaker diagnostic data, simplify the speaker tuning process, and increase the barge-in AEC performance compared to the conventional, linear model based, smart amplifiers,” said Mike Luh, Senior Director of Marketing of Smart Home Product business group, at Nuvoton Technology Corporation America.

Both the NAU83G10 and the NAU83G20 devices are a mono Class D amplifier with IV sense ADCs.  A powerful Cadence Tensilica HiFi Audio DSP core is integrated inside to run the KCS algorithm efficiently, and both devices can support I2C control and I2S/PCM/TDM audio interface.  The NAU83G10 device can deliver up to 8W output power into 4ohm load and 6.5W for 8ohm using a highly efficiency Class G boost converter.  The NAU83G20 device can deliver up to 20W for 4ohm and 11W for 8ohm around 12.6V external battery supply level.

Key Hardware Features

  • Ultra Low-Noise and yet Powerful Mono Boost Class D Amp
    • 8 W Output Power @ 4Ω Load, <10% THD+N, 5V Battery for NAU83G10
    • 20 W Output Power @ 4Ω Load, <10% THD+N, 12.6V external supply for NAU83G20
    • Low Output Noise in Receiver Mode: 12 µVRMS for NAU83G10
    • Highly adaptive Class-H Boost Converter with Multi-Level Tracking for NAU83G10
    • Highly Efficient Class D Amplifier
    • Over 92 dB Power Supply Rejection Ratio (PSRR)
    • 50-Ball Wafer Level Chip Scale Package (WLCSP) with 0.5 mm Pitch


  • Unique KCS Software features for Improving Speaker Performance
    • Adaptive, nonlinear control to generate more sound pressure output
    • Cancelation of DC displacement and other nonlinear distortion (THD, IMD)
    • Predictive speaker protection against thermal/mechanical overload
    • Voice coil rest position control without mechanical sensor
    • Adaptive compensation of varying speaker parameters
    • Automatic speaker equalization to the desired bass response
    • On-line speaker diagnostics to improve product reliability


Nuvoton, a former subsidiary of Winbond Electronics Corp, has been shipped for more than one-billion voice and audio chips in the last twenty-plus years. The Nuvoton audio integrated circuit devices were developed to help designers worldwide to successfully develop high-fidelity audio applications, at price points that will fuel growth in high-quality audio in an every-broadening range of portable devices.

KLIPPEL is an innovative leader in providing unique test equipment for electro-acoustical transducers and audio systems. Founded in 1997 by Dr. Wolfgang Klippel, the novel techniques developed for control and measurement systems of loudspeakers and other transducers are the result of over 30 years of fundamental research.


  • Smartphones
  • Laptops / PC
  • Tablets / Mobile Phones
  • Bluetooth / Wireless Speakers
  • Portable Game Controllers


NAU83G10 and NAU83G20 engineering samples and evaluation systems are available now through all Nuvoton sales channels.

Further information:


About Nuvoton Technology
Nuvoton Technology Corporation (NTC) was founded to bring innovative semiconductor solutions to the market. NTC was spun-off as a Winbond Electronics affiliate in July 2008 and went public in September 2010 on the Taiwan Stock Exchange (TSE). Nuvoton Technology focuses on the developments of microcontroller, microprocessor, smart home and cloud security IC and has strong market share in Industrial, Consumer and Computer markets. Nuvoton owns a wafer fab, featuring customized processes for analog and power products. Besides in-house IC products, the wafer fab also provides part of its capacity for foundry services. Nuvoton Technology provides products with a high performance/cost ratio for its customers by leveraging flexible technology, advanced design capability, and integration of digital and analog technologies. Nuvoton values long term relationships with its partners and customers and is dedicated to continuous innovation of its products, processes, and services. The company has established subsidiaries in the USA, China, Israel, India, Singapore, Korea and Japan to strengthen regional customer support and global management. For more information, please visit


Product Contact

Jin Kim

Director of Product Marketing

Nuvoton Technology Corporation America


Tel: +1-408-474-1654

News Contact

Carol Chang

Nuvoton Technology Corporation


Tel: +886-3-5770066 ext.23123

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