Here's the vibrometry of V4 (pre-production series prototype) compared to V3 and V2.
The accelerometer is attached to the top front of the headshell, and the vertically modulated 0 to 20 kHz sweep recording is played. The output from the accelerometer is conditioned, amplified and converted to g
. We're keeping our tradition of using the Audio Technica AT7V
cartridge for the vibration measurements.