Crossover circuit is used to split audio frequencies into 2 or 3 part. There are 2 kinds of crossovers, active and passive. Passive crossovers is use to connect woofer, midrange and tweeter speakers to one source. It basically splits the frequency into 3, bass frequencies to woofer, mid frequencies to midrange speaker and high frequencies to tweeter. Active crossovers is used to split signal going to the amplifier. The benefit of using active crossover is that you have more controls, you can tweak levels and frequencies. The main disadvantage is the cost, aside from the crossover itself is expensive, it will also require multiple amplifier.
Circuit
2-Way Linkwitz Riley Crossover
The circuit above is powered by 12V power source, it could be an 12 AD/DC adoptor. The crossover frequency is set at around 100Hz but you can easily change it for your own requirement. The formula is simple:
C = 1/(2*pi*f*R)
pi = 3.1416
f = desired frequency in Hz
R = resistor value (10k)
R = R2, R3, R4, R5, R13, R16, R11, R10
C = C2, C3, C4, C5, C12, C8, C9, C10
Set R to 10k or higher and compute for C or you can set C and compute for R instead.
Simulation Result
Downloads:
Simulation file – Download here