I have two Energy Encore bookshelf speakers in the kitchen powered off a digital amplifier. They do a fine job and have now been augmented with the Yamaha sub. The sub doesn't have a built in crossover so I just used an inline 100 low pass RCA FMOD that I had from a project years ago. What I'm running into now is that if I push the volume the Encores start to distort on the low end so I'd like to filter that out. I came across these high pass filters on PE but wondering if I couldn't build them cheaper based on their plans. https://www.parts-express.com/pedocs/tech-diagrams/266-462--crossover--schematic.pdf From what I'm seeing though buying the raw components would be even more expensive. Thoughts?