paranoidandroid
Active member
- Joined
- Jun 3, 2004
- Messages
- 38
abbey road d enfer said:From this, I can see High and Low-pass filters, a Bass (LF) control and a Mid control. How is this supposed to allow 25kHz EQ?
It seems like each band is handled by a separate circuit, so I would think that rules out interaction; the plot thickens...
Sorry I forgot to mention as I don't think Peter provided a full schematic of his final design but I believe he added in two pairs of appropriate capacitors to the high shelf section to allow for a 20kHz and 25kHz shelf. He also specified a mid-inductor that had the 9kHz value which also wasn't on the original. So these additions seem to be behaving in very unique ways due to possible limitations from the midband inductor going by what Ian said. And now that I think about it, I wonder if the addition of the 9kHz tap on the inductor could have added significantly enough to the parasitic C to move the inductor resonance into the audio band?