Notch/Low Cut Filters

[Bob Branstetter]

Originally Posted by Phil Maneri

Simple.

I use the Notch quite a bit as a high pass filter/phase reversal when the Cut seems to drastic. Engage the filter, set on notch, turn knob all the way left and your done. With the full circle its nice and clean and tight on the bottom that way.

On occasion when the room just booms like crazy I'll switch the switch to cut leave everything else alone and keep playing.

Oh and all these adjustments assume the EQ is set flat. I'd adjust my filters first before touching the EQ. Use EQ only after that if you need it.

Thank you Phil for giving me exactly what I was looking for specific to doublebass and AI amps. Fortunately, I don't run into situations where filtering is necessary very often, but now I have a practical guide for using filtering when the occasion demands it.

[David Powell]

I have used the notch filter on a Focus head to get the "C" out of a room. We had a few jazz gigs in this place that had awful acoustics but still we had to play at a relatively high volume level. Everytime I hit a "C" anywhere on the instrument I had howling feedback. So I put the notch filter on and rolled it over until I had the notch on the "C" frequency, somewhere around 125 Hz. In this type of use the filter is like a narrow parametric EQ cut. Really all you have to do is put the filter on and sweep back and forth until you find where the culprit frequency is. It's one of the best and most useful features on the AI. It won't cure every situation, but it's a great feature for those situations that it will handle.