Re: Designing a crossover for a DIY speaker project
typically there are 3 engineering methods to use:
1.) get drivers that have a large overlap in bandwidth, then use a simple filter.
2.) use a complex, steep filter with speakers that have little overlap in bandwidth.
3.) use modeling software to find a middle ground for speakers with some overlap using moderatly complex filters.
from here, the crossover points are chosen based upon driver performance. drivers have well-known issues at both high frequencies (beaming, breakup) and low (overexcursion, T/S model). these issues help to define usable bandwidth. for instance, a speaker may have an excelent response up to 3khz, but then have a terrible response at 4khz. this means that even with a steep filter, the cutoff may need to be 2khz.
generally, filters should be below 300hz and above 3khz. 300-3khz is the most important band for voice recognition. this is only a loose rule though. i've used filters at 2khz with no issues.
-- Chris, M. Sci, Electrical Engineering
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