2-way passive audio crossover

I designed a simple 2-way passive audio crossover, consisting of 2 power inductors and 2 non polarized electrolytic or ceramic capacitors so this makes for a second-order design or 12 dB/octave. This order is commonly used in passive crossovers as it offers a reasonable balance between complexity and response. Higher order audio filters are harder to design, because components interact with each other.

Second order passive filter schematics

I calculated the component values for the audio crossover based on the Linkwitz–Riley capacitor and inductor ratios. I chose the cutout frequency to be at 4000 Hz. This value was choosen to better protect the tweeter from lower frequencies.


The pcbs were provided by PCBWay who offer fast and reliable service. Packega came in fast, only taking 4 days to arrive. PCBs came well packaged. On the fist glance the PCBs looked good, the solder pads were nice and sharp. This was the first PCB that I ordered with a silkscreen and it also looked very nice. I was happy with the PCB service, mostly by the fast shipping and production time. You can order your own PCBs here: https://www.pcbway.com/project/shareproject/2_way_Audio_crossover.html

Great quality PCBs provided by PCBWay

If this is your first time ordering from PCBWay can also use my referral link: https://www.pcbway.com/setinvite.aspx?inviteid=353185 or visit their website: https://www.pcbway.com/

I sourced all the filter components from Würth elektronik who offer great quality passive components.

Pcb in a reflow owen

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