Millennia Media NSEQ-HF - High Frequency EQ for 500-Rack

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Millennia Media NSEQ-HF - High Frequency EQ for 500-Rack


Millennia Media NSEQ-HF - High Frequency EQ for 500-Rack

Millennia's NSEQ-HF is the high frequency peaking/shelving section of the industry-standard NSEQ-4 in a 500 Series module.

Full Timbral Control, Total Signal Integrity

Thousands upon thousands of professional engineers use the discrete JFET Class A NSEQ parametric EQ in mastering, post-production, live sound, mixing, and tracking. It's the parametric EQ found in the acclaimed STT-1 Origin Twin Topology channel strip. It's the same EQ topology found in the world's most widely used phono archiving system, the LOC (Library of Congress, etc.). It's the EQ used by countless professional artists from Celine Dion to Andreas Bocelli. It's the EQ used on the 2-bus main mix for over a decade of Academy Awards TV orchestra broadcasts (along with 100+ channels of Millennia HV-3 micamps).

It may not be an exaggeration to say that most clients use the NSEQ to breathe top-end musical life into their tracks. The one comment we hear continually:  "the 21kHz top end boost sounds like music, not like EQ."

So we thought it was time to create a new product that focused exclusively on the NSEQ's top end. We call it the NSEQ-HF, and it's ready now for your 500-rack, at an attractive price point. The NSEQ-HF employs the identical circuitry found in the NSEQ-4:  our renowned FSA-03 Class A all-discrete J-FET amplifier and our DSA-01 Class A all-discrete J-FET true-differential line receiver. Both amplifiers use hand-matched Toshiba 2SJ74 and 2SK170 discrete J-FETs exclusively (no signal path ICs), considered the holy grail of pure Class A discrete audio design topology.

  • World's first (and only) all-discrete, true differential Class-A JFET input buffer/amplifier
  • Selectable balanced or unbalanced input
  • Transformerless signal path
  • True hard-wire bypass when EQ not selected
  • Minimalist design: only one active stage in the audio path (Dove Topology)
  • Extremely low noise: -106 dBu
  • Constructed for demanding professional applications
  • Ultra-Premium components throughout
  • Gold mil-spec Grayhill rotary freq-select switch
  • Lovingly hand-crafted in Northern California


Filter Shape Shelving at 6 dB per octave. When LED is off, EQ is peaking with a fixed "Q" of 1.0
Maximum Output Level + 21 dBu
Maximum Input Level (EQ Flat) + 20 dBu Balanced, +14 dBu unbalanced
Maximum Input Level (EQ Full Boost) + 17 dBu
Frequency Response
+0 / -3 dB
sub 2 Hz to beyond 300 kHz
Maximum Cut/Boost (21 Step Detented) +/-18 dB (+/-9 dB with range switch in)
Frequency Centers – (Peak/Shelf Selectable) 4.8 k, 5.8 k, 8.0 k, 10 k, 16 k, 21 k
THD + Noise  
20 Hz - 30 kHz, All EQ Bands Switched In < .009%, typ < .003 %
Common Mode Rejection Ratio
10 Hz - 20 kHz, 100 mV C.M.
> 60 dB, Typ > 80 dB
Slew Rate, +21 dBu Out > 50 volts per microsecond
Hard-wire Bypass Switch?  Yes
Input Impedance 25 kilohms
Minimum Output Load Impedance 50 ohms
Recommended Load > 500 ohms
Output Impedance 5 ohms
EQ Amplifiers Pure Class-A Discrete J-FETs
Power Power consumption is +210mA with all LEDs on

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