It seems the Cinema Engineering Program Equalizer low cut is a shelving filter?

At your risk. Basic, quick frequency responce tests at bass -12dB showed (towards low frequency) slow decrease below say 5KHz, then more abrupt below 2KHz, finally shelving at about 150Hz. At a setting of -4dB, simmilar but gentler slope, shelvibg at around 300Hz. The Pleiades (130Ohm,20mH) gave a somehow similar responce but starting dropping at a much higher frequency. (signal generator by by Lode output impedance, aprox. 400 Ohms, readings taken on Rohde & Schwarz Psophometer).