I see, I have built this low pass circuit, tho I don't know if it works, I dont have an oscilloscope nor a multimeter. While listening to the output (yellow and black wires at the top connected to my headphones) I cannot really hear a diffrence in terms of cutting off higer frequencies (IF my calculations are correct it should cutoff at 1500Hz, and one with a 2k resistor instead of a 1k sounds the same). I understand that the filter is not instand, and it has a curve, but I don't hear the bass louder than the highs, in fact I hear all frequencies equally lover than the input. I may have misunderstood something so please help me fix this.
