The slopes of the 535 are very gentle shelving type which reach their peaks outside of the generally accepted audible band (20 to 20kHz). A maximum of 4dB/octave is achieved at full boost/cut.
Based on the active version of the classic Baxandall circuit, the 535 includes an amplifier for each band to avoid band interaction.
The XQP 535 Program EQ is VPR Alliance approved.