ACG EQ-01-4k

SKU:BBG 4775


  • 2-Pickup 4-Knob
  • Dual Low Pass - High Pass Filter
In Production

ACG is making these. We will have more of these within 2-4 weeks. Order it now, to reserve your place in line and we'll ship it the same day we receive it from ACG.


Will this work in your Bass?

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Control Configuration

  1. Volume/Blend Stack
  2. Lowpass Neck Pickup Filter Stack
  3. Lowpass Bridge Pickup Filter Stack
  4. Highpass Filter Stack


The EQ01 is the newest preamp offering from the team of ACG and John East. It is also filter based like the EQ02, but with a feature that will be instantly recognizable to players or fans of Alembic or Wal basses.

It has *dual* lowpass filters, one for each pickup independently. The dual lowpass setup has long been recognized as one of the most versatile tone shaping configurations. The idea being that it is possible, via the resonant peak of the lowpass, to 'retune' the resonant frequency of each pickup individually before the summing of the two signals. In this way you can emulate the frequency response of any bass or pickups in existence.

While some may say the circuits ability to perform this trick is debatable... as comparisons of such an 'emulation' against 'real' versions of various basses will no doubt reveal some subtle details being still different. There is no doubt that this is one of the most powerful tone-shaping packages ever offered to the public at a reasonable price.

Question: Where Can I Buy an ACG EQ-01-4k ?

Answer: You can buy this from Best Bass Gear by Calling 877-839-3531 or Emailing us at or chatting with our Bass Techs


Rate and Review this item
Verified Buyer
ACG EQ-014K An excellent buy
By Jon Boone
Excellent buy if you like Low-Pass filter tone. Even with knobs it will cost less than 1/2 of the Alembic circuit.
Easy install with good instructions and pics to help. Not quite sure you need a high-pass filter with this system.