Yes but your Amp input impedance is much much less than his MECO VM, so naturally the HF break point is much lower. The vale of the cap is also determined but the driving impedance to form the break frequency. Naturally your circuit works, of course.
As Colin mention, using a 47K Ohm bias resistor, well that might work and it might not, but the R/C time constant has to be low enough to pass the LF one wishes, else it gets shunted to the source voltage.
The R/C time constant should be round 200Hz or so for human voice. All now that is needed is the bis requirements for the crystal. I would suggest he look that up or contact the vendor of the mic for recommendations which is what he should have done before contacting us to begin with. Always, always contact the manufacturer 1st.
Once you know the resistor bias value the cap value is easily calculated.
He could experiment with your circuit but instead of the phono jack, use a 10K resistor, which is probably
close to you amps input impedance, it certainly isn't an order of magnitude off. Then he would simply put his MECO VM across the 10K and look for the signal.
Who know it may work, but still contact the manufacturer for recommendations and appropriate values, if anyone know they do.
