Mercury EQ-P1 MK IV - Pultec Style Passive EQ

Mercury EQ-P1 MK IV - Pultec Style Passive EQ

The Mercury EQ-P1 MK IV is a passive EQ based on the original Pultec equalisers. The EQ-P1 is designed to bring life and musicality back that may have been lost in recording. The EQ-P1, like the vintage Pultec EQP1a uses a passive EQ circuit with a fully balanced (push-pull) gain make up amplifier.

The Mercury I.S.T. Switch offers the choice to switch the Inter-stage Transformer in or out of the circuit. Giving engineers a choice with a flick of a switch between the standard Mercury warm, musical, "vintage" tone with the I.S.T. Switch not engaged (out) or a much more open and airy version of the same full, warm tone with the switch engaged (in). In the original Pultec EQP the Inter-stage transformer was always in the signal path. With the I.S.T. Switch engaged and the inter-stage transformer not in the circuit, there is slight widening of the sound and slightly more open top end. Many of today's engineers value this feature on the Mercury EQ-P1 and now the Mercury EQ-P2 Studio Program Equalizers to have choice between two great, but different sounds without changing their frequencies or setting and hearing the change instantly. Note: With the I.S.T. Switch engaged or not, the input and output transformers are always in the circuit.