KCS Evaluation

This page will guide you through the process of operating and evaluating Klippel Controlled Sound (KCS).

KCS is an adaptive software solution featuring nonlinear speaker control, active speaker protection, linear and nonlinear distortion reduction, automatic system alignment and much more. You find more information about features and capabilities of this technology on the Klippel Homepage. A short overview is given in our KCS Flyer.

Step 1: Choose suitable KCS evaluation hardware platform

Your target 


Smartspeaker, TV, Laptop, 
Automotive Headrest Speaker
Umax < 24 V: 
HiFi, Studio Monitor, 
Automotive Woofer
Umax > 24 V: 
HiFi, Studio Monitor, 
Pro-Audio, Subwoofer            
Nuvoton NAD G10   Nuvoton NAD G20Klippel KA3 AlSpEX
(includes internal amplifier)      
Klippel KA3 LSpEX + external amplifier  

Supply voltage

5 V [2.9…5.5 V]
(Battery powered devices)

5...14 V 
(Devices with power cord)

# Channels

Stereo (2 Mono Chips)

 KCS Mono + Tweeter 

KCS Mono + Tweeter

Peak output 
voltage Umax

10…12 V 

14 V

20…24 V

Determined by external amp

Minimum DCR

~4 Ohm

~2 Ohm

Determined by external amp

Where to order?

Nuvoton Direct Online Shop

Contact sales(at)klippel(dot)de

If suitable for your application, we strongly recommend to acquire NAD bundled with a reference speaker in the Nuvoton online shop. Working with NAD is the quickest solution to market since KCS is fully integrated in silicon here. Together with a reference speaker this will allow you to assess the full potential of KCS together with the opportunities of green speaker design.

Step 2: KCS Initial parameter identification

This step is required if you want to run KCS with a new type of speaker.

➥ Note that if you have received a reference speaker together with your KCS hardware, this step has already been performed and you can directly start with step 3.

➥ If you do not have access to the required hardware Klippel Analyzer 3, alternative solutions are available. Please contact sales(at)klippel(dot)de.

For operating KCS, initial KCS parameters are required. They describe the particular speaker model and your chosen KCS hardware platform. The speaker is measured using the KLIPPEL software module KCS-ID Parameter Identification which runs on the KLIPPEL Analyzer 3. The recorded signals are sent to the KCS Server which identifies the linear and nonlinear speaker, amplifier and calibration parameters and stores them in a KCS Monitor operation. Now they are ready to be uploaded to your target DSP, which is done in the next step.


Video Resources: KCS-ID

Required Software: Klippel dB-Lab

Step 3: Operating and tuning KCS on your hardware

The software module KCS Monitor from Klippel is your operational interface to KCS. 
In this section we will show how to:

  • Operate KCS
  • Listen to music
  • Get diagnostic information from amp and DUT
  • Set up speaker alignment and equalization with KCS
  • Find the limits of your full audio system
  • Tune KCS settings to optimize performance


Manual: KCS Monitor    

Video Resources: Nuvoton Demo-Video 

Step 4: Objective measurements and subjective evaluation

Make sure that KCS is operating as intended and perform objective evaluation measurements using critical test stimuli.  

In five tutorials we will go through how to use software modules of the KLIPPEL Analyzer System to

       1. Check the setup
       2. Measure frequency response
       3. Evaluate active speakers
       4.Check the protection system
       5. Assess multitone distortion reduction

In addition, we provide guidance on how to unveil Rub&Buzz issues.

You can also perform listening evaluation on your favorite music or program material in your desired target environment.


Manual: KCS Evaluation Tutorials   

Downloads: KCS Evaluation Template

Video Resources:

Further reading: AN22 Rub & Buzz