The XQP 535 Program EQ is an active Baxandall 2-band design. Each band has two frequency choices and its own amplifier to prevent interaction.
A very gentle EQ, at maximum boost or cut, the slopes will be around 4dB/octave and max out around +/- 9dB. Despite the 10k and 15k markings on the HF control, the actual corner frequencies of this band are way out in space - more like 30k and 40k - so the slope continues beyond audibility.
