Mercury EQ-H1 – MK IV

Mercury Recording Equipment EQ-H1 – MKIV – STUDIO PROGRAM EQUALIZER – MONO

The Mercury EQ-H1 features a passive EQ circuit with a single ended gain make up amplifier topology, based on the vintage ‘Pultec EQH’ circuit. The Mercury EQ-H1 circuit provides a musically satisfying result unobtainable with active and parametric EQs, since it does not rely upon negative feedback (and all its associated phase and dynamic distortions) to achieve equalization. The EQ-H1, like all Mercury products, has transformer balanced (XLR) input and outputs. The only modern additions or changes to the original are a much more powerful and stable power supply and running DC on the heaters, rather than AC, and two additional frequencies to expand the range and make it more flexible.

The Mercury EQ-H1, EQ-P1, EQ-H2 and EQ-P2 are all based on the original Pultec equalizers which were tools developed to deal with the limitations of recorded music. Limitations that most often manifest themselves in the highest and lowest frequencies of the program material. The Mercury Studio Program Equalizers, like the family of original Pultec EQs, are originally designed to bring back the life and musicality lost in a recording. Whether by accident or genius, nothing has been able to do this better in music production than a passive equalizer with tube gain make up amplifier (‘Pultec style’) equalizer. The interaction of the passive boosting and attenuating shelving EQs (not relying on negative feedback), as well as the transformers, tubes and other amplification circuitry all add to the incredibly musical character of the product. Working engineers try other types of equalizers, but always end up coming back to the Pultec style as the equalizer of choice for those final touches while tracking or mixing and even mastering at times.

Now in this modern age of digital recording, where the source you put into the DAW is exactly what you have on the track, with no rounded edges, no slight compression and none of the “pixie dust” that came with analog tape, the Mercury family of equalizers are needed more than ever to help add the musicality, warmth and tone to your tracks that we have all treasured.

Key Features:

• Low Frequency Select (CPS; Cycles per second): 20, 30, 60, 100, 200 Hz
• Low Frequency Boost Control: Shelf Boost, 0dB to +13dB
• Low Frequency Attenuate Control: Shelf Atten. 0dB to -17dB
• High Frequency Select (KCS; kilocycles per second): 3, 4, 5, 8, 10, 12, 16 kHz
• High Frequency Boost Control: Shelf Boost, 0dB to +16dB
• High Frequency Attenuate Control: 10k Shelf Attenuate, 0dB to -16dB

• Tubes: 1x 12AX7 and 1x 12BH7
• Rack Size: 2U
• Weight: 17 lbs.
• Shipping size: 24″ x 16″ x 8″

Mercury Recording Equipment products are not hybrid circuits, emulations of circuits, or “clones”. We get the same sound, same tone and same musicality because we use the highest quality parts, all the tubes, and especially all the transformers in our products — like the vintage circuits we are paying homage to.

EQ-H1 vs EQ-P1:

Simply, the key to the tone of these two circuits is its amplifier, and Mercury EQ-H1 and EQ-P1 have different amplifiers to make up the gain lost by the passive equalizer circuit, thus it has a different tone. Meaning the EQ-H1 and EQ-P1 sound different on the same application, and have a different reaction to the same instrumentation or voice.

The EQ-H1 is more punchy and robust and has a slight push in the low end and lower midrange. The EQ-P1 is more open and silky, and equally adds warmth to highs, mids, and lows of your source. Although both sound amazing on any application and are both multi-purpose tools (equalizers) in the studio, if you had both you could then choose between applications.

The Mercury EQ-H1 is warm and fluid but a bit “thicker” than the EQ-P1, thus shines on thickening (and pushing forward in the mix) your Vocals, Bass, Kick, Snare, and Acoustic Guitar etc… The Mercury EQ-P1 is great for shaping and adding ‘air’ to your vocals, acoustic instruments, guitar, piano etc… and is magical strapped across your two buss to add musicality to your mix.