The “Nite” or “Air” EQ project is a clone of the discontinued Nightpro EQ3D equalizer. It’s standout features are a dedicated “sub” shelf and an exceptionally high, 40kHZ “air” filter. PCBs have long since run out, so it’s now a self-etch project.

Images courtesy of Peterc, Dagoose Music, and KHStudios

Notable Features:

• Has the following fixed, band filters:
  • Sub shelf
  • 40Hz
  • 160Hz
  • 650Hz
  • 2.5kHz
• And the following settings for the adjustable shelving filter:
  • 2.5k
  • 5k
  • 10k
  • 20k
  • 40k (air)
• Runs on +/-18vdc power rails

Price: No products available.

More info:

• Schematics and a PCB overlay at KHStudio’s website.
• Great build pictures from Dagooose Music.
• The Group-DIY build thread.
• Sound on Sound’s review of the original unit.