Many speaker crossover schematics are available in PDF format from Aaron Audio’s archive page. Passive crossover circuits are filter circuits that separate the audio signal coming from an amplifier into suitable frequency ranges and distribute it to speaker drivers such as woofer, mid, and tweeter. This separation process is usually done with passive components such as capacitors, coils, and resistors.
The main purpose is to ensure that each driver operates in the frequency band where it is most efficient, to maintain sound balance, and especially to protect sensitive drivers such as tweeters from unwanted low frequencies.
In two-way systems, the crossover circuit usually feeds the woofer with a low-pass filter and the tweeter with a high-pass filter. In three-way systems, in addition to this, there is also a separate band-pass section for the mid speaker. First-order filters have a slope of 6 dB/octave, while second-order filters have a slope of 12 dB/octave; as the filter order increases, the frequency separation becomes sharper, but the circuit structure also becomes more complex.
In passive crossover design, not only the theoretical cutoff frequency but also speaker impedance, the real frequency response of the drivers, level balance, and phase relationships are important. A filter that looks correct on paper may not give the same result on the actual speaker. Therefore, although ready-made schematics provide a good starting point, measurement and fine adjustment according to the drivers used are required for the best result.
Passive Crossover Circuit Schematics PDF List
Note: There are also a few amplifier circuit schematics. I am not sure whether they can be built. Still, let them be included in the archive. There is no PCB drawing for the Crossover Circuits. In old designs, I had seen them mounted directly on MDF or chipboard and the components connected together. They are not complex anyway; surface mounting can be done.
- aaron-ap-1mk2-ap-1-ap-3-ap-4.pdf
- aaron-ats-1-ats-1-mk4-ats-2-ats-3-mk4-ats-3-ats-4-ats-5.pdf
- aaron-audio-technology-AP-1Mk2Xover.pdf
- aaron-audio-technology-AP-1Xover.pdf
- aaron-cc-15-cc-30-cc-60-mkii-cc-60-cc-120-cc-240-mk4.pdf
- aaron-d-100-d-200-d-400-1-d-400-2.pdf
- aaron-hyperboloid-hcc-300-hcc-600-hss-300-hss-600.pdf
- aaron-ic-120-ang-ic-120.pdf
- aaron-iw-60-iw-120.pdf
- aaron-p-3xover.pdf
- aaron-sat-50-sat-60.pdf
- aaron-ss-10-ss-15-ss-60mkii-ss-60-ss-120ss-200-ss240.pdf
- AP-3Xover.pdf
- AP-4Xover.pdf
- ATS-1MK2Xover.pdf
- ATS-1MKIVXover.pdf
- ATS-1Xover.pdf
- ATS-2Xover.pdf
- ATS-3MKIVXover.pdf
- ATS-3Xover.pdf
- ATS-4MKIVXover.pdf
- ATS-4Xover.pdf
- ATS-5MKIVXover.pdf
- ATS-5Xover.pdf
- CC-120Xover.pdf
- CC-15Xover.pdf
- CC-240MKIVXover.pdf
- CC-240Xover.pdf
- CC-30Xover.pdf
- CC-60Mk2Xover.pdf
- CC-60Xover.pdf
- Decor-D-100Xover.pdf
- Decor-D-200Xover.pdf
- Decor-D-400-1Xover.pdf
- Decor-D-400-2Xover.pdf
- HCC-300Xover.pdf
- HCC-600Xover.pdf
- HMF-600Xover.pdf
- HSS-300Xover.pdf
- HSS-600Xover.pdf
- IC-120AngXover.pdf
- IC-120Xover.pdf
- IW-120Xover.pdf
- IW-60Xover.pdf
- P-3Xover.pdf
- SAT-50Xover.pdf
- SAT-60Xover.pdf
- SS-10Xover.pdf
- SS-120Xover.pdf
- SS-15Xover.pdf
- SS-200Xover.pdf
- SS-240Xover.pdf
- SS-60Mk2Xover.pdf
- SS-60Xover.pdf
- Sub-120MkI-circ-diagram.pdf
- Sub-120MKII-circ-diagram.pdf
- SUB-120MkIII-pre-amp-circuit.pdf
- Sub-240-circ-diagram.pdf
- Sub-60MkI-circ-diagram.pdf
- Sub-60MkII-circ-diagram.pdf
- SUB-60MkIII-circ-diagram.pdf
- SW-200-amp-circuit-dia-MkII.pdf
- SW-200-amp-circuit-dia.pdf
- SW-400-amp-circuit-dia-MkII.pdf
- SW-400-amp-circuit-dia.pdf
- ZA-100 Circuit.pdf
Source: aaronhifi.com.au/resources/circuit-diagrams.php (closed)
