500 Series Equalizers

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Single channel 500 Series EQ module based on Pultec EQP-1A designs.
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
Designed for recording, mixing and mastering applications, the single rack space API 5500 is a two-channel EQ package with an…
50th Anniversary Edition reproduction of Saul Walker’s design of the original 550A 3-band EQ. Limited to 50 Units Worldwide.
3-band switchable EQ module for 500 Series format complete with switchable 12dB per octave 50Hz to 15KHz band pass filter…
This limited edition EQ is a continuation of the equalizers produced by API exactly as they were in the 1960's,…
7 switched frequency centres per band, fully discrete, click detente in 2 dB steps with 12 dB boost or cut,…
10 bands of fully discrete API proprietary equalisation, fully variable 12dB boost or cut, proportional Q narrows filter Q at…
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…
500 Series single channel 3-band EQ module with switchable passive bass filters, all discrete circuits, transformer balanced everything, and the…