This parametric eq's preamp 'IN' has an impedance of 20k.  Can it be easily changed to a 1M input impedance for piezo amplification?
The schem is here:
http://www.symetrixaudio.com/tech_support/web_support_only/sx201.htm

I guessing R14 needs to be changed from 20k to 1M and possibly increasing the value for R75 to compensate?

Jun