The Class AB equalizer circuit of the EQ-81 MKII is similar to the EQ section of the classic 1081 module, but without high and low pass filters. The sound character is warm, powerful and musical. The EQ-81 MKII features stepped frequency controls that offer a wide range of frequencies from 33 Hz to 15 kHz. The BASS and TREBLE frequency bands are switchable between shelving and bell filters. The mid frequency band is a fixed Bell filter with a switchable Hi Q setting. The control range is +/- 18 dB. All four bands can be bypassed. The EQ-81 MKII can either be used as a standalone EQ or connected to the insert jack of one of the Golden Age Project preamplifiers.