Limitations that most often manifest themselves in the highest and lowest frequencies of the program material. The Mercury EQ-H1, EQ-P1, EQ-H2 and EQ-P2 are based on the original Pultec equalizers which were tools developed to deal with the limitations of recorded music. Tubes: 1x 12AX7 and 1x 12AU7, per channel High Frequency Attenuate Control: Shelf Attenuate, 0dB to +16dB High Frequency Shelf Attenuate Select: 5, 10, & 20k High Frequency Boost Control: Shelf Boost, 0dB to +18dB High Frequency Bandwidth Control: Sharp to Broad Low Frequency Attenuate Control: Shelf Atten. Low Frequency Boost Control: Shelf Boost, 0dB to +13dB Note: With the IST engaged or not, the input and output transformers are always in the circuit. 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. switch engaged and the interstage transformer not in the circuit, there is slight widening of the sound and slightly more open top end. In the original Pultec EQP the Interstage transformer was always in the signal path. Switch not engaged (out) or a much more open and airy version of the same full, warm tone with the switch engaged (in). Giving engineers a choice with a flick of a switch between the standard Mercury warm, musical, “vintage” tone with the I.S.T. Switch offers the choice to switch the Interstage Transformer in or out of the circuit. Besides a much more powerful and stable power supply and running DC on the heaters, rather than AC, only other modernization is one of Mercury EQ-P2’s best features, the Mercury I.S.T. The new Mercury production utilizes only the highest quality passive components, while remaining true to the original production. The Mercury EQ-P2 has transformer balanced input and output, a passive EQ circuit and with a fully balanced (push-pull) gain make up amplifier. Besides a much more powerful and stable power supply and running DC on the heaters, rather than AC, an additional frequencies to expand and make it more flexable, only other modernization is one of Mercury EQP2’s most popular features, the Mercury I.S.T. This new Mercury production utilizes only the highest quality passive components, while remaining true to the original classic and like all Mercury products has transformer balanced input and outputs. The Mercury EQ-P2 has a passive EQ circuit with a fully balanced (push-pull) gain make up amplifier. Mercury EQ-P2 is based on the vintage Pultec EQP1a circuit. «The Mercury EQ-P2 is two independent (dual mono) channels of our popular Mono, Mercury EQ-P1 Studio Program Equalizer in a 3U package.
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