Jump to content

low pass filter control mod....


Recommended Posts

so guys,  I want to upgrade my bass that has an Aguilar OBP2 in it to include a low pass mid filter...similar to an Alembic or Wal filter.

I used to have an Alembic and miss their filter and Q boost and finding that I use the filter setting on the ottobit jnr on its own quite a bit.

trouble is, I'm not sure if this control/ circuit  is available and where to get one from...

anyone ever done a similar mod who can pass on some advice.


Link to comment
Share on other sites

I recently bought a state variable low-pass filter with variable Q from Helmuth Lemme. Details here - https://www.gitarrenelektronik.de/produkte/aktive-elektronik/state-variable-filter-detail.

High quality electronics and reasonably priced. Intended for onboard installation but I configured mine as an external pedal to have the flexibility to play around with different basses. Works great. Freq range is from 300Hz to 5kHz. Q factor is continuously variable (weak to strong) with a pot or you can use a 3-position mini-switch.


There's also an Alembic style filter called JTEX Distiller made by a chap in Canada available on ebay:




Edited by ikay
  • Like 2
  • Thanks 2
Link to comment
Share on other sites

4 hours ago, jazzyvee said:

I have two sets of ACG EQ02 filter modules in my beater bass and I would like to have them put into a pedal instead so that I can use it as switchable eq. 

I'm sure Alan had an EQ02 in pedal format. Sure I remember seeing it at one of the last UK Bass Shows in Manchester.

Might be worth having a word.

Link to comment
Share on other sites

On 16/01/2021 at 21:41, Jabba_the_gut said:

This might be worth a look for filter type preamp.




I put one in a bass - I really like it, but I'm not sure it'd get you where you want to go when you're talking mids as it's a pure lowpass with a switch to increase the resonant peak.  Don't get me wrong - it's kind of perfect for me, but if I'm reading you right might not provide enough adjustment for you?

Alan was saying here that he has some of his EQ-01 :


Link to comment
Share on other sites

  • 3 months later...

The NFP, or Double NFP are second order low pass filters with a resonant peak at the cutoff frequency. The potentiometer allows you to travel between , approximately, 150hz and 4khz. The potentiometer is push-push for boosting the cutoff frequency. It's not a mids pot, but you can make it act like one by adjusting the pot. You'll take more advantage of the preamp with a double version that allows you for more variety.

  • Like 2
  • Thanks 1
Link to comment
Share on other sites

  • 3 weeks later...

That JTex is pretty wonderful. I have two and had them installed in my Ibanez Musician, one per pickup. Great sound, and the three position Q boost switch is really nice. These are very similar to the setup in the Alembic Series I. I took them out as I returned the Musician to stock in preparation for sale, and I put one of the distillers into a single pickup fretless bass I have. 


Edited by OJtheD
  • Like 1
  • Thanks 2
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...