Crossover Development Using Calsod 3.2
Here is the raw data that we will use to begin our crossover development. I trimmed off the data below 100 Hz as it was pretty wild from reflections and such and doesn't contribute anything to the discussion at hand. We will concentrate on the development of the mid-tweet crossover at approximately 2000Hz, but the midrange hi-pass at 250 Hz is an integral part of anything we do to the midrange. We will include it in everything we do.
You can see that the data from both drivers is very similar for quite a ways on both sides of the chosen crossover frequency. This is good as the farther past the crossover point the data remains flat, the easier it will be to design the crossover. We will take each driver independently and see how well we can make them match a given filter shape, then we will combine them together and see what happens. Hang on, its going to be a bumpy ride!
Another piece of data that we will need is impedance for each driver. This was measured in LAud and imported into Calsod just like the frequency data.
The Raven tweeter has a nearly flat impedance at 5 ohms since the amplifier only sees a transformer. The Focal midrange has a typical impedance curve with a peak at the resonant frequency, a dip down to the nominal impedance, then a steadily rising inpedance as the voice coil inductance takes over at higher frequencies.
We will start with the tweeter crossover.