Haven't found any simple way to calculate the xover frequency properly as most online calculators use the same standard values and the same order. My xover is a 2nd order LP and 3rd order HP.
Any hints?
A 2nd-order Butterworth LP filter consists of:
* a 1.8mH inductor in series with the driver
* plus a 14uF cap across the driver.
A 3rd-order Butterworth HP filter consists of:
* a 13.3uF cap in series with the driver
* followed by a 2nd cap - 40uF - also in series
* and a 0.95mH inductor connected across the driver between the 2 caps.
These values are for:
* an 8 ohm driver
* and 1000Hz 'roll off' frequ.
If you double the frequ ... you halve the coil & cap values.
If you halve the frequ ... you double the values.
If you change the XO 'roll off' frequ from 1000Hz to 500Hz ... you halve the inductance & double the capacitance.
If you know your XO values, the above should enable you to work out where the LP & HP 'roll-off frequencies are.
If you want to send me the LP & HP filter component values, I will sim them for you (I use lspCAD) and show you:
1. a graph of the result, plus (potentially)
2. a slightly different combination of LP & HP filters which should result in a flatter overall FR.
Just send me a PM.