Just trying to learn about this and I find there are at least four ways to do it.
Looking from source to driver:
1.series cap, series coil, parallel cap, parallel coil
2. series cap, parallel coil, series coil, parallel coil
3. series coil, parallel cap series cap, parallel coil
4. series cap, series coil, parallel cap, series coil
They all appear to use about the same values for caps and coils.
I assume they all would work, but is there any real electrical or audible difference?
Looking from source to driver:
1.series cap, series coil, parallel cap, parallel coil
2. series cap, parallel coil, series coil, parallel coil
3. series coil, parallel cap series cap, parallel coil
4. series cap, series coil, parallel cap, series coil
They all appear to use about the same values for caps and coils.
I assume they all would work, but is there any real electrical or audible difference?
Without defining the order of the xover, perhaps unanswerable
1&3 appear to be 2nd order, perhaps 1 has a higher minimum impedance
2 looks dodgy
4 appears to be a combo of 1st order HPF & 3rd order LPF
Sim them in Xsim and see what they really do
1&3 appear to be 2nd order, perhaps 1 has a higher minimum impedance
2 looks dodgy
4 appears to be a combo of 1st order HPF & 3rd order LPF
Sim them in Xsim and see what they really do
Good practice to use 3rd or 4th order highpass for over excursion.
Then your decided Low pass.
Simulate best filter options in enclosure calculator for highpass
Then simulate in crossover simulator for values.
After you realize cost of larger coils needed. And complexity.
It's lot easier to use active filters. Likewise common plate amps with adjustable high/low filters and phase
Bandpass with port resonance and higher order filters needed for excursion protection. Yes the higher order filters make a big difference
Then your decided Low pass.
Simulate best filter options in enclosure calculator for highpass
Then simulate in crossover simulator for values.
After you realize cost of larger coils needed. And complexity.
It's lot easier to use active filters. Likewise common plate amps with adjustable high/low filters and phase
Bandpass with port resonance and higher order filters needed for excursion protection. Yes the higher order filters make a big difference
You can play with different topologies in Spice to understand the filter by it's self driving a resistive load. Not all crossover simulators allow other than very standard configurations.
Choice of filter order can depend on a lot of things. One should model each driver and see what the excursion is at whatever SPL you intend.
Choice of filter order can depend on a lot of things. One should model each driver and see what the excursion is at whatever SPL you intend.
Two masterpieces of 3 way design here, courtesy of Mr. Troels Gravesen:
http://www.troelsgravesen.dk/33FWK.htm
http://www.troelsgravesen.dk/3WClassic.htm
The SEAS 503 employs resistors for impedance correction. The Classic 3 way uses a mid of low inductance, so doesn't need it.
https://www.diyaudio.com/community/...over-design-3-way-eton-speakers.301649/page-3
http://www.troelsgravesen.dk/33FWK.htm
http://www.troelsgravesen.dk/3WClassic.htm
The SEAS 503 employs resistors for impedance correction. The Classic 3 way uses a mid of low inductance, so doesn't need it.
https://www.diyaudio.com/community/...over-design-3-way-eton-speakers.301649/page-3