Mercury Recording Equipment Company

EQ-H1 Mk. III

Studio Program Equalizer

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.

I used the EQ-P1 and EQ-H1 extensively in mixing scenarios, and they performed like champs. I was able to dial in silky top-end on vocals and acoustic guitars and beefy lows on kick drums and mic'd bass cabinets with truly 'pro' results. There were many times when i hit upon a certain setting and found it was 'that sound' I had heard for years on 'that famous record' that didn't seem possible to get with 'other gear'. These EQs are so perfectly geared to music that - even with extreme settings - it's hard to get bad results with them.

Pete Weiss, TapeOp Magazine

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.


   

MERCURY EQH1 BACK PANELNow 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.

Frequencies
  • 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
SPECIFICATIONS
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.

The Mercury EQs (EQH1 & EQP1) are a quite original. All the tone of a classic tube equalizer but without the noise and much more power... Nothing sounds quite like an old Pultec but Mercury EQs are one of the best sounding tube Equalizers on the planet.

Joe Chiccarelli, Grammy Award Winning Producer/Engineer/Mixer (The White Stripes, The Shins, Beck, U2 and more)

Mercury provides amazing build quality, a beautiful aesthetic and impeccable accuracy. I cannot imagine a better version of what they manufacturers.... Mercury will be the dominant force in our industry for years to come.

Brian Garcia, Producer/Mixer/Engineer (Avril Lavigne, Kelly Clarkson, Our Lady Peace, King's X and more)
Read the review

Mercury EQ-H1 Mk. III Studio Program Equalizer
LIST PRICE: $2,950
US STREET PRICE: $2,500
US STREET PRICE (PAIR): $4,750

Mercury EQ-H1 Data Sheet
Mercury EQ-H1 Recall Sheet

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 warm 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 you mix.