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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 9
The crossover frequency of 1000 Hz is where the two lines on this graph cross over each other.
In crossovers with three or more output bands, there are two filters for each of the middle bands.
A low-pass filter rolls off frequencies above a certain cutoff point. A high-pass filter rolls off
frequencies below a certain cutoff point. This leaves a band of frequencies in the middle. These
middle bands have two different cutoff points. Figure 6 shows the responses of the three bands of
a three-way crossover.
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
20
31 62 125 250 500 1000 2000 4000 8000 16000
Frequency (Hz)
Gain (dB)
Low Output
Mid Output
High Output
Figure 6 - Three-Way Crossover Response
As you can see, a three-way crossover has two crossover points. One determines where the lows
cross over to the mids, and the other determines where the mids cross over to the highs.