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PEQ

Introduction​

PEQ (Parametric Equalizer) is a high-precision, fully-parameterizable, professional-grade equalization function for HiFi audiophiles and professional users. It is different from ordinary fixed-band graphic EQ, and supports customization of frequency points, gain, Q-value, and filter types to achieve fine and precise tuning of the frequency response of sound, and is suitable for different headphone/earphone characteristics and music styles. It can be customized to fit different headphone/earbud characteristics, listening preferences and music styles.

Parameter Description​

Mainly contains the following parameters:

  1. Frequency

    • Description: the frequency range of the audio signal to be adjusted, generally expressed in Hz
    • Adjustable range: 20Hz~20kHz (the entire human ear can hear the frequency band)
    • Purpose: select the target frequency to be adjusted, can be adjusted to the frequency band, is not limited to a fixed band

  2. Gain

    • Description: the target frequency to be adjusted, can be adjusted to the frequency band, is not limited to a fixed band
    • Gain
    • This function is not limited to a fixed band. Gain

  3. Description: Adjustment of the amplitude of the audio signal, that is, the strength of the filter. Usually expressed in decibels (dB).

    • Adjustable Range: -12dB ~ +12dB (Attenuation/Boost)
    • Function: Controls the volume intensity at the target frequency point, +dB boost, -dB attenuation
    • Q Value (Quality Factor)

  4. Description: The Q value is used to characterize the width and steepness of the filter, i.e., it indicates the degree of adjustment of the filter's frequency response to the audio signal.
    Adjustable range: 0.2~20.0

    1. Role: control the filter bandwidth/steepness: the larger the Q value, the narrower the band, the steeper the curve, affecting only a very small range of frequencies; the smaller the Q value, the wider the band, the flatter the curve, affecting a wide range of adjacent frequency bands
    2. Filter Type:
    3. Commonly, there are several types of filters as follows:

Low Shelf (Low Shelf Filter): the filter is used to adjust the frequency response of the audio signal. Low Shelf (Low Shelf Filter): all low-frequency below the set frequency point to do the overall lift / attenuation, suitable for adjusting the thickness of low-frequency, dive

High Shelf (High Shelf Filter): all high-frequency above the set frequency point to do the overall lift / attenuation, suitable for adjusting the high-frequency brightness, extension​

  1. Peaking (Peaking Filter): the most commonly used, the center of the frequency point of the precise lift / attenuation, suitable for correcting the frequency response, highlighting vocals. Headphone Frequency Response, Highlighting Vocal/Instrument

    • In audio processing, according to the need to adjust the frequency response of the audio signal, you can choose the right type of filter and set the corresponding Q value, in order to achieve a better audio effect.

  2. Features and Advantages

    • Professional accuracy, no fixed frequency band limitation
    • Different from ordinary 10-band EQ (fixed 20/60/170Hz, etc.), PEQ can be set freely for each band, which can accurately correct the defects of the frequency response of the headphones/earbuds (e.g., low-frequency booming, high-frequency harshness, and vocal depression)

Visualization and real-time preview​

Provides real-time frequency response curve, which intuitively displays the overall frequency response change after adjusting the parameter of each band. Visualization and real-time preview​

  1. Provides real-time frequency response curves to visualize the overall frequency response change after each parameter adjustment

  2. Seamless switching and real-time effect during playback, allowing you to compare the audible difference between different PEQ solutions without pausing

  3. Where to find & how to use

HaiBei Music (APP)​

  1. Open HaiBei Music → Draw out the sidebar → PEQ

  2. Turn on the switch, drag each slider to adjust

  3. You can save the customized preset, or load the official/others' shared PEQ configurations

HaiBei Player (Android)​

  1. Settings -> Audio Settings -> PEQ

  2. Turn on the switch, drag each slider to adjust

  3. You can save the customized preset. You can also load official/other people's shared PEQ configurations

HaiBei Player (non-Android)

Audio Settings - " PEQ​

  • Turn on the switch, drag each slider to adjust
  • You can save customized presets, and you can also load official/other people's shared PEQ configurations

Common Useful Scenarios​

  1. Headphone Frequency Response Correction: Use PEQ to compensate for headphone frequency response defects (e.g., too much low frequency → low shelf attenuation, high frequency harshness → high shelf attenuation, vocal depression → mid-range peak boost)
  2. Music Style Optimization: Pop → boost mid-range vocals, moderate low frequency; Classical → flat frequency response, small boost High-frequency extension; rock → enhance the low-frequency dive and strength
  3. Eliminate problematic sounds: use a high-Q trap filter to eliminate specific frequency point teeth, headphone resonance, bottom noise