Passive high pass filter before Topping TP22

[7V]

I'm using a Topping TP22 to actively drive a supertweeter.

I've read that it can be a good thing to place the LC network before the amplifier rather than between the amp and speakers. But how do I actually do this? No one seems to say.

Thanks for any advice.
Regards
Steve

 

[7V]

Apparently, the input impedance of the TP22 is 22Kohms.

 

[rayma]

Apparently, the input impedance of the TP22 is 22Kohms.

A simple first order low pass filter is a series resistor and a shunt capacitor.
If the R is 4.99k and the C is 750pf, the corner frequency is 52kHz,
including the loading effect of the input impedance.

 

[7V]

Thanks. 🙂

 

[rayma]

Thanks. 🙂

If you want to change the 52kHz to a different frequency, you change the capacitor value.
Just multiply the 750pF by (52 kHz / Fnew kHz) to get the new value.
For example, to get 60kHz, use 750pF x (52/60) = 750pF x 0.87 = 650pF.