Posted by Wayne Parham [ 68.91.15.81 ] on November 02, 2004 at 15:59:34:
In Reply to: crossover electronics posted by Tony Valetti on November 02, 2004 at 13:14:33:
I did a little seminar at MAF 2003 called "Crossover Electronics 101" where we looked at a few simple circuits that are often used in crossovers. We touched on first-order, second-order and third-order networks, as well as conjugate filters and other compensation networks. There were a couple of handouts at the "Crossover Electronics 101" seminar, one having the schematics and response curves and another having formulas and explainations. In this seminar, we could see a schematic, look at its response curve and listen to what the circuit actually sounded like.
Passive crossovers do a lot more than just splitting the frequency sent to each driver. Since the driver itself is reactive, it becomes part of the filter. That's one reason why the crossover often exhibits some peaking. The interaction between the driver's voice coil and circuit capacitance forms a resonant circuit. If it isn't properly damped, it can generate a peaked response curve. Higher order networks have both inductance and capacitance, so they also form resonators that should have a specific load value of resistance for proper damping to prevent peaking. Since the loudspeaker is not purely resistive, that can also be a source of peaking. In some cases, it is enough to be noticeable and can be quite pronounced.
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