Two channel 2U mono 3 band Pultec-type rack-mounted equaliser

Update of the highly musical HM2EQ Hammer EQ three-band valve/hybrid EQ with detented gain controls, additional frequency points

3-band switchable EQ module for 500 Series format complete with switchable 12dB per octave 50Hz to 15KHz band pass filter and 2 x 2520 op amps on the output +4 balanced XLR I/O.

This limited edition EQ is a continuation of the equalizers produced by API exactly as they were in the 1960’s, featuring hand-wired switches, the original circuit board design and API founder Saul Walker’s signature on the chassis.

Surgically precise wide-ranging 3-band filter for 500-series

Before modern semiconductor technology, audio filters and equalizers were made with passive components – capacitors and wound coils of wire that formed inductors (or chokes).