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Professional EQ Demo
Accurate parametric EQ with mathematical frequency response
About Professional Parametric EQ
A parametric equalizer provides precise frequency shaping using mathematical biquad filters. This demo implements accurate filter calculations, Q factor bandwidth relationships, logarithmic frequency scaling, and real-time transfer function visualization.
Mathematical Parameters:
- Frequency: Center frequency of the bell filter (Hz)
- Gain: Boost/cut amount at center frequency (±15dB)
- Q Factor: Filter selectivity - Q = f₀/BW
- Bandwidth: Width of affected frequencies (Hz)
- Biquad Coefficients: Digital filter implementation
- Logarithmic Scaling: Perceptually accurate frequency display
Implementation Features:
- Accurate bell filter frequency response calculations
- Real-time biquad coefficient computation
- Professional RTA with 4.5dB/oct analyzer slope
- Logarithmic frequency axis (20Hz-20kHz)
- Interactive frequency response curve
- Q factor bandwidth visualization
Professional Parametric EQ Plugin Interface
Input Spectrum
20Hz20kHz
Pink Noise Reference
Pink noise reference
4.5dB/oct analyzer slope
4-BAND PARAMETRIC EQ
0 Active | Ref: 0.0dB @ 1kHz
Band 1
200 Hz
0 dB
1.5
Band 2
1000 Hz
0 dB
1.5
Band 3
5000 Hz
0 dB
1.5
Band 4
10000 Hz
0 dB
1.5
Output Spectrum
20Hz20kHz
EQ Applied
EQ response applied
0 bands active
Mathematical Frequency Response
Frequency (Hz)Gain (dB)
Real-time biquad filter response calculation
Active bands: None
Professional Implementation Notes
Q Factor Relationships
Q = f₀/BW. High Q (>5) for surgical cuts, medium Q (1-3) for musical shaping, low Q (0.5-1) for broad tonal changes. Q affects bandwidth logarithmically.
Frequency Targeting
Sub: 20-60Hz, Bass: 60-250Hz, Low-Mid: 250-500Hz, Mid: 500-2kHz, Upper-Mid: 2-5kHz, Presence: 5-8kHz, Brilliance: 8-20kHz.
Mathematical Precision
Biquad filters provide exact frequency response. Use RTA to visualize cumulative effect. Each 6dB boost doubles perceived loudness at that frequency.