Crossover design is an entire discipline in and of itself. Part science, part art.Electric Wisdom wrote: ↑Wed Mar 14, 2018 3:44 pm Ah ok that calculator is like a recommendation startpoint then, i get it thanks
But the caps for tweeters are not close to the values on that calculator isnt it?
The other ones seems close tho
For example, your 8 ohm woofer is not 8 ohms. Look at the specification sheet for the 3012HO. The impedance in free air varies from a low of about 7 ohms, up to a high of about 120 ohms depending on frequency. Once you put that driver in a box that impedance changes depending on the box design. When you design a filter you take into account the actual impedance of the woofer/box system at the frequency that you want to crossover. Again that is your starting point and you fine tune to taste after that. You can't just enter 8 ohms into a crossover calculator and get a great result because your driver won't be 8 ohms at the frequency where you want to crossover.
The tweeter array in the simplex is also a 4th order crossover which will have very different cap values than the 2nd order crossover on that page you are looking at.
There are also different crossover types, there are Bessel, LR, Butterworth, etc. Each type will have different cap and inductor values to get the desired slope and phase response.
Also, doing the above doesn't guarantee great results. You need to look at the phase responses of the woofer and the tweeter after your crossovers to make sure that they play well with each other and take into account any lobing that might happen. Designing crossovers is very involving and makes or breaks your design. A simple calculator doesn't cut it in a good design.