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<blockquote data-quote="CertifiedHoodClassic" data-source="post: 8902601" data-attributes="member: 685714">You could just use an inductor if you don&#039;t need/care about a steep slope. It&#039;s like using a capacitor as a low pass filter if you&#039;ve ever done that.First find the inductance you need: [URL unfurl=&quot;true&quot;]https://www.omnicalculator.com/physics/low-pass-filter[/URL]I got about 180 micro henry, I&#039;ll just round to 200 which gives about 3.2 khz crossover point. You could also do 150 uH for 4.2 kHz.then just go to parts express or ebay and find one (make sure it&#039;s not one of those tiny ones because they can&#039;t take much power)[URL unfurl=&quot;true&quot;]https://www.parts-express.com/Dayton-Audio-AC20-20-0.20mH-20-AWG-Air-Core-Inductor-Coil-257-024?quantity=1[/URL]says it&#039;s 1.38&quot;x 0.5&quot; so it might be too big, but that&#039;s how you&#039;d do it.</blockquote>

[QUOTE="CertifiedHoodClassic, post: 8902601, member: 685714"] You could just use an inductor if you don't need/care about a steep slope. It's like using a capacitor as a low pass filter if you've ever done that. First find the inductance you need: [URL unfurl="true"]https://www.omnicalculator.com/physics/low-pass-filter[/URL] I got about 180 micro henry, I'll just round to 200 which gives about 3.2 khz crossover point. You could also do 150 uH for 4.2 kHz. then just go to parts express or ebay and find one (make sure it's not one of those tiny ones because they can't take much power) [URL unfurl="true"]https://www.parts-express.com/Dayton-Audio-AC20-20-0.20mH-20-AWG-Air-Core-Inductor-Coil-257-024?quantity=1[/URL] says it's 1.38"x 0.5" so it might be too big, but that's how you'd do it. [/QUOTE]

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