I wonder if someone can help. I have a subwoofer which has an extreme low bass equalizer, nominally around 25 Hz with both boost and cut. Strangely, while the center detent is at the physical center of the pot, counterclockwise it goes down to -12 dB and clockwise it boosts up to +3 dB. I'm running the pot near the full attenuation and it is very sensitive at that point on the attenuator. I'd like to move the active control position to a place where a tiny move has little effect. So I need a cut of around -10 dB to happen nearer to the center of the rotation. In other words, I need attenuation and I would never need a boost, so the part of the circuit in the CW direction needn't have much effect.
It's a two-pole circuit that's a bit over my head, so I'd appreciate some help. What do you think if I remove R136 and R129? If I have that right, that will give me less gain and so force me to turn those pots more CW to get my same desired level. But I'm not sure of the effect on the crossover frequency, I'm whistling in the wind here.
It's a two-pole circuit that's a bit over my head, so I'd appreciate some help. What do you think if I remove R136 and R129? If I have that right, that will give me less gain and so force me to turn those pots more CW to get my same desired level. But I'm not sure of the effect on the crossover frequency, I'm whistling in the wind here.