Cartridge loading calculator
Why cartridge loading matters
A phono cartridge and the phono preamp’s input form a resonant filter. This can have effects in the audible range.
By matching the capacitance and impedance of the phono pre to the inductance of the cartridge, the resonant peak can be minimized or even eliminated.
This calculator will give you a frequency response graph. The X-axis shows the frequency (20 Hz–20 kHz, i.e. the audible range), but on a linear scale, allowing you to see the problems in the treble region very well. To put things in perspective: the mid-range (around 1 kHz) would be in the middle of a plot with logarithmic frequency scale, which is commonly used for frequency plots).
Cartridge resonance calculator
Why cartridge compliance and resonance matter
The turntable tonearm and phono cartridge have a subsonic resonance frequency that depends on the effective weight of the entire tonearm (including headshell), cartridge and the mounting hardware used as well as the compliance of the cartridge.
The resonance is usually below the audible range, but it may still cause problems with footfalls or record warp when it’s too low or have effects in the audible range when it’s too high.
This calculator will tell you the resonance frequency of your system and whether it is too low or too high.