High Pass / Low Pass Filter

[Danbieranowski]

I'd love a board with a simple High Pass and Low Pass filter. This could be used for tightening up low-end for distortion circuits or creating a "lo-fi" effect. Maybe splitting a signal into two different sets of bands (like the old clean low end / distorted high end for bass). All kinds of fun stuff.

 

[Danbieranowski]

In looking at these tone controls, what determines the SLOPE of the filter?

 

[giovanni]

That’s the thing with passive filters. You don’t have a lot of flexibility controlling the shape of it. You get no resonance (at least afaik) and the frequency dependent amplitude depends on the number of RC filters you have. Also keep in mind that passive filters will alter the impedance of the signal potentially causing other problems downstream, e.g., if you don’t have a buffer after it, you may get additional filtering due to cable capacitance that disappears when you engage a pedal after the filter, making it harder to shape your tone.

 

[giovanni]

Check out this article that explains what I mean.

 

[Danbieranowski]

That’s the thing with passive filters. You don’t have a lot of flexibility controlling the shape of it. You get no resonance (at least afaik) and the frequency dependent amplitude depends on the number of RC filters you have. Also keep in mind that passive filters will alter the impedance of the signal potentially causing other problems downstream, e.g., if you don’t have a buffer after it, you may get additional filtering due to cable capacitance that disappears when you engage a pedal after the filter, making it harder to shape your tone.

All great info! Thank you.

 

[andare]

These filters are useful to bass players to cut the low end rumble and take the ice-pick off a tweeter and tighten up the sound. A lot of people on Talkbass have embraced the Broughton Audio filters.
They have selectable frequencies and attenuation control.