Pultec EQM-1S

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Mastering version of the legendary Pultec EQP-1S with 0.5dB stepped gain controls.


The Pultec EQM-1S mastering eq is a modern recreation of the rare EQP-1S with added stepped controls for mastering applications and different frequency points and curves.

The Pultec EQM-1S has been meticulously reproduced from the original EQP-1S3 by Dr Steve Jackson, using only original-spec components to deliver the same stunning sound of the original vintage units. Adapted for mastering applications the EQM-1S uses Progressive-taper Elma switch controls with a 0.5dB of boost and cut for precise settings and easy recall. As a result, the gain has been reduced to 10dB boost/cut instead of the original values.

Pultec’s unique design uses two bands with separate boost and cut controls that can be combined to create a resonant shelf curve. These curves are key to the Pultec sound by boosting a band without unwanted frequency build-up, offering a tight and musical sound. For mastering applications, these curves allow to add weight and foundations without boxiness and add presence or air without harshness. The EQM-1S also offers the choice between peak and shelf modes which delivers different sonic characteristics, as well as boasting different frequency points compared to the EQP-1A:

Low Shelf Boost/Cut: 30kcs 40kcs, 70kcs and 100kcs
High Bell Boost:1kcs, 2kcs, 3kcs, 4kcs, 5kcs, 6kcs, 8kcs, 10kcs, 12kcs
High Shelf Boost: 5kcs, 10kcs
High Shelf Cut: 5kc, 10kc, 20kc

Furthermore, their passive designs ensure that no distortion is generated by the curves. This design is compensated by a tube driven push-pull amplification placed after the equalisation stage, compensating for the loss of volume.

Pultec EQM-1S Mastering EQ Features:

Boost, cut, or both – it all sounds great
The sound of Pultec heard on decades of amazing recordings
Single-channel, two-band equalizer built exactly like the original, legendary Pultec units
Combines the vintage character of original Pultecs with the reliability of modern designs
Incredibly low noise floor for a pure sound
Bandwidth control lets you decide how wide a range you’re sculpting
Separate boost and cut controls provide additional creative potential
Adapted for mastering applications


Low shelf boost: +10 dB in .5 dB steps @ 30, 40, 70, 100 Hz
Low shelf attenuate: -10 dB in .5 dB steps @ 30, 40, 70, 100 Hz
Mid/high peak boost: +10 dB in .5 dB steps@ 1, 2, 3, 4, 5, 6, 8, 10, 12 kHz
5, 10 kHz shelf boost, 0 – 10 dB
High shelf attenuate: -10 dB in .5 dB steps @5, 10, 20 kHz
Precision mastering-grade 21-position boost/cut rotary switches
Input impedance: ~600 ohms
Output impedance: ~50 ohms
Noise: 92 dB below +10 dBm
Distortion: ≤ 0.15% at +10 dBm into 600 ohms
Amplifier: Flat, 20 Hz to 20 kHz, +/- 0.5 dB
Tubes: 1 each – 12AU7, 12AX7, 6X4


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