9.3Essential
FabFilter Pro-Q 4 is an equalizer plug-in with up to 24 bands, dynamic EQ, spectral dynamics, and linear/natural/zero-latency phase modes.
Plugin comparison
FabFilter Pro-Q 4 vs PSP ClassicQlite
Specs, price and the Dubspot Score, side by side — with our verdict on which effect to buy.
Independent score / workflow fit / buying signal
Contenders
The side-by-side
PSP ClassicQlite is a free British console EQ voiced after early Neve designs, with musical shelves, a bell band, a high-pass filter and PSP's second-generation SAT saturation.
Technical matrix
Specs compared
| Signal | FabFilter Pro-Q 4 | PSP ClassicQlite |
|---|---|---|
| Price | $199 | Free |
| Dubspot Score | 9.3 | — |
| Formats | VST, VST3, AU, CLAP, AAX Native, AudioSuite | VST, VST3, AU, AAX |
| EQ bands | Up to 24 bands | Low shelf, high shelf, midrange bell, high-pass (20 Hz to 400 Hz) |
| Filter shapes | Bell, Notch, High/Low Shelf, High/Low Cut, Band Pass, Tilt Shelf, Flat Tilt, All Pass | — |
| Filter slope | Up to 96 dB/octave, plus Brickwall option for LP/HP | — |
| Processing modes | Zero latency, Natural Phase, Linear Phase, plus Gentle/Warm character modes | — |
| Dynamic processing | Dynamic EQ and spectral dynamics with adjustable attack/release | — |
| Channel modes | Mid/side and left/right; surround up to Dolby Atmos 9.1.6 | — |
| Type | — | British console EQ (early Neve voiced) |
| Price | — | Free |
| Saturation | — | PSP second-generation SAT stage |
| Formats | — | VST, VST3, AU, AAX (64-bit) |
| Platforms | — | Windows 10 to 11; macOS 10.14 to macOS 27 (Intel and Apple Silicon) |
| Authorization | — | Free iLok account, three activations |
See the full plugin database for more comparisons.