I am reviewing a v/o track I recorded. I have a high-pass/ low-pass filter set on an external parametric eq at 80hz/11000hz. Bandwidth is set to 'shelf'. At approx. 2khz, there is an obvious spike when viewing the audio signal with an analyzer plugin. It is inconsistant with the rest of the frequency curve. I think it represents a +6dB increase, and is as thin as a tooth pick visually. What is the cause of something like this? Thanks. -ptfigg.