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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: RE: My DIY Story: nanoDIGI DSP based active crossover and 4 subwoofer integration posted by dumpingground on January 3, 2020 at 09:11:46:
One unfortunate development from the Chinese clone Class A were power on and power off thumps. I added a 68uf capacitor inline on the positive speaker cable going from the amp to the tweeter section of my speakers. With an active crossover setup like mine, there is no passive crossover components between the amp and the speakers. So any unplanned energy from the amp goes directly to the tweeter.
The goal here was to add a capacitor with a filter point at least 2 octaves below the active filter point with the intent that the additional cap would not impact the response of the tweeter circuit but would prevent DC and low frequencies from making their way to the tweeter panel. The theory is also that that cap 2 octaves below would not impact the sound in the more critical frequencies of the Magnepan 1.6 tweeter panel. I used an erse audio Pulse-X cap for this exercise. Not super high end but not bargain basement either.
Once I put the cap in the circuit, I was able to measure the speaker response with REW EQ software. I did measure a slight 1 db reduction in the 200-500hz region of the speaker response. So I used the nanodigi PEQ function to boost those frequencies to compensate.
The thumps are gone now. A great set of posts about the idea behind the cap protection circuit is here:
https://www.audiofrog.com/community/tech-tips/to-cap-or-not-to-cap-tweeters-in-systems-with-active-crossovers/
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Follow Ups
- Tweeter Protection Capacitor - dumpingground 01/3/2011:03:39 01/3/20 (0)
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