John White says in the Scalar Digitizer video that Spooky Scalar will modulate up to 5 Mhz, but there will be distortion.
Since the resonance frequency of the Scalar device is the usually 5-6 MHz, you will want the modulation frequency to be significantly lower than the resonance Frequency. The Scalar Digitizer biofeedback scan goes to 50 kHz, and the Scalar shell preset has a higher limit of 2MHz.
Doing a scalar scan is much more delicate of operation thus the lower frequencies for scanning, but for treatment, the rate can go higher.
For more details, please check the link from:
https://www.spooky2.com/forums/viewtopic.php?f=117&t=10586