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Equalization & Alignment (EQA)

Optional Module for the KLIPPEL QC Framework

  • Align frequency response

  • Adjust sensitivity

  • Assisted manual tuning

  • Optimal EQ filter settings

  • Microphone testing

  • System equalization

The QC Equalization + Alignment is a versatile tool for adjusting the level or frequency response of transducers, audio systems or electronics. Stimulus shaping is applied to automatically achieve a user defined target response. The resulting level profile may be used for applications like microphone testing with equalized sound sources. In manual mode, the operator is assisted in adjusting external controls like gain or EQ filters with minimal time and learning effort.

Requirements

Hardware
• KLIPPEL Analyzer 3 (KA3)
• Production Analyzer (PA) or audio interface (sound card)

Software
• QC Standard or R&D Software 210 or higher (+ EQA license)

Accessories
• Microphones  (opt.)
• Amplifier or KA3 equipped with QC Card or Amplifier Card (optional for passive speakers)

Demo Video

Applications

Microphone Testing

For this application, a reference microphone and the microphone under test (DUT) are coupled to the same volume stimulated by a sound source. The EQA task is used to equalize the sound source, ensuring consistent excitation of the DUT within the complete tested frequency range. The frequency response difference curve of the two microphones as well as distortion may be tested against limits to derive PASS/FAIL verdict.

  

Adjusting EQ of Active Speaker

Active audio systems like studio monitors provide a factory equalizer to fine-tune the frequency response and level at the end of the line. The EQA is a valuable tool to assist the operator in adjusting these controls. In Manual mode, the measurement is repeated until target response is achieved within specified tolerance. Assisted mode takes it to a more advanced level by giving instructions to optimally adjust the controls within shortest time, even with untrained operators.

  

Amplifier Roll-Off Compensation

Typical audio amplifiers suffer from a high-pass characteristic at very low frequencies, resulting in gain decay. The EQA may be used to determine and compensate this characteristic. By this, consistent excitation of the DUT can be assured within the complete tested frequency range.