Passive (Passive EQ Filters) = Broad Strokes, e.g. Knif Soma, Pultec 1A, 52dB Audio Pequex, Chandler Curve Bender
Program EQ (Boosts and Attenuates Symmetrically) = Broad Strokes, e.g. Knif Soma Passive Tube EQ, All Pultecs, 52dB Audio Pequex, BAX (Shelves Only),
– Notice that Real Original Pultec has Tubes, but there are also Solid State Pultecs
Surgical = Sweepable Frequencies and Q, e.g. GML, Sontec
Summing EQ (Boosting Only) = All Maag EQs,
Graphic EQ (NO Discrete OP Amps and Indicators) = EQ with Fixed Frequencies, Usually 31 or 15 or 10 or 5 Band, Some have a Proportional Q Such as API 560
API = Discrete OP Amps and Indicators (Capacitors), Proportional Q, Stepped Factors e.g. API 550(0), Avedis E27, CAPI BT50
Neve / British EQ (Baxandall Shelves, Inductor Mids) = Vintage Neve, Trident, Chandler Red Devil
Vanilla EQ = OP Amps and Indicators, Most Used EQ, e.g. SSL
Paragraphic EQ = Graphic EQ with Q and Usually Many Bands
Transformer (MIC / LINE) = Included in Most Above EQ Styles e.g. Neve Transformers 1073/1084/2254
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