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Mission M35 crossover woes
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<blockquote data-quote="Sproggit" data-source="post: 1167296" data-attributes="member: 14792"><p>15uF electrolytic that sits between the low & mid+high frequency section.</p><p>Not so much dead as audibly out of spec, which is classic old electrolytic failure mode, capacitance decreases and ESR increases, so less of the mid signal was getting through.</p><p></p><p>It was my prime suspect, so I'm pleased to report that crossovers are not black magic, just simple high-school level electronics theory.</p><p></p><p>I am thinking about designing new crossovers for the speakers, maybe getting some FR measurement response files from each section in isolation while mounted in the cab (easy enough to do) and then plugging those values into a passive crossover designer.</p><p></p><p>I'll do it if I can find some free time, and will even post a step - by - step journey & results.</p><p></p><p>If any of the super-high-end capacitor / resistor / inductor manufacturers want to sponsor components, I'll be happy to include them in a side-by-side test, otherwise I'll just use whatever standard theory tells me should work <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Sproggit, post: 1167296, member: 14792"] 15uF electrolytic that sits between the low & mid+high frequency section. Not so much dead as audibly out of spec, which is classic old electrolytic failure mode, capacitance decreases and ESR increases, so less of the mid signal was getting through. It was my prime suspect, so I'm pleased to report that crossovers are not black magic, just simple high-school level electronics theory. I am thinking about designing new crossovers for the speakers, maybe getting some FR measurement response files from each section in isolation while mounted in the cab (easy enough to do) and then plugging those values into a passive crossover designer. I'll do it if I can find some free time, and will even post a step - by - step journey & results. If any of the super-high-end capacitor / resistor / inductor manufacturers want to sponsor components, I'll be happy to include them in a side-by-side test, otherwise I'll just use whatever standard theory tells me should work :) [/QUOTE]
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Mission M35 crossover woes
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