Millennia NSEQ-4


Discrete Solid State Two Channel Parametric EQ


About this item



Millennia NSEQ-4

Full Timbral Control, Total Signal Integrity

  • World’s first (and only) all-discrete, true differential Class-A input buffer/amplifier.
  • Selectable balanced or unbalanced input.
  • Greatly improved 3rd generation FSA-03 all-discrete EQ amplifier
  • Improved output stage
  • True hard-wire bypass when EQ not selected
  • Upgraded power supply
  • Fully parametric stereo EQ with unprecedented sonic purity and integrity
  • All discrete J-FET solid state signal path
  • Minimalist design: only one active stage in the audio path (Dove Topology)
  • Identical EQ stage used in Library of Congress archiving path
  • Four EQ bands: 20 Hz to 20 kHz center frequency, 0.4 to 4.0 Q
  • Extremely low noise: -106 dBu
  • Constructed for demanding professional applications
  • Ultra-Premium components throughout
  • Gold relays, connectors, switches,
  • Silver Teflon power wiring, Mogami Neglex OFC audio wiring
  • Lovingly hand-crafted in Northern California


  • NSEQ-2 can be converted to an NSEQ-4

Specificationsdown arrow

“Q” RangeQ = 0.4 to 4.0 Adjustable on middle ranges
 Q = 1.0 Fixed on low & high ranges
Maximum Output Level> + 28 dBu
Maximum Input Level (EQ Flat)+ 28 dBu
Maximum Input Level (EQ Full Boost)+ 17 dBu
Frequency Response 

+0 / -3 dB

sub 2 Hz to beyond 300 kHz
Frequency Response, Stereo Deviation+/- 0.5 dB (with Mastering Option)
Noise (All EQ Stages In, Controls Flat)-106 dBu
Maximum Boost (21 Step Detented)+20 dB (+10 dB with range switch in)
Maximum Cut (21 Step Detented)-20 dB (-10 dB with range switch in)
EQ Frequencies 

Low Range Switch (Centers – Peak/Shelf Selectable):

20, 34, 56, 100, 180, 270

Low Mid Sweep:

20 Hz – 220 Hz or 200 Hz – 2.2 kHz.
10X Range switch selectable.

Hi Mid Sweep:

250 Hz – 2.5 kHz or 2.5 kHz – 25 kHz.
10X Range switch selectable.
High Range Switch (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, +27 dBu Out> 50 volts per microsecond
Main Hard-wire Bypass Switch For Each Channel?Yes
Peak/Shelf Selection On High & Low Range?Yes
Hard-wire Bypass Switching On Individual EQ Bands?Yes
Input Impedance25 kilohms
Minimum Output Load Impedance50 ohms
Recommended Load> 500 ohms
Output Impedance5 ohms
EQ AmplifiersPure Class-A Discrete J-FETs

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