but if you need to add a buffer for higher orders, you might as well go fully active...
I am not so sure about that. I have yet to find an active topology that doesn't intrude... mind you i haven't tried everything.
I am intending on experimenting with buffered PLLXO ... buffered with something like B1 like circuit
dave
re:"mind you i haven't tried anything"
That should be everything, not anything.... i have tried a lot of stuff. All op-amp based thou. Salen-Key, State Variable, and an op-amp buffered PLLXO are among those.
dave
ok , i tried many solutions, and decided to swap OPamps ... but each PLLXO needs an input buffer , so the tube solution seems to be the best . http://retro-forum.com/viewtopic.php?f=14&t=15223&p=95390&hilit=PLLXO#p95390
ok , i tried many solutions, and decided to swap OPamps ... but each PLLXO needs an input buffer , so the tube solution seems to be the best . http://http://retro-forum.com/viewtopic.php?f=14&t=15223&p=95390&hilit=PLLXO#p95390
Hi Coresta,
This looks like a very special and rare application. Looks like there are inductors in there as well.
More generally speaking; my experience is that when applying a PLLXO you need a preamp with enough gain and low output impedance because of the insertion loss in the filter.
2. order filters are doable as long as there is gain enough in the amps.
Best
Kris
I am running four way stereo speakers off PLLXOs, a mix of first and second order.
Insertion loss is handled through use of a couple of OEP brand transformers. Transformers work great if the preamp has enough clout. I imagine a passive preamp for example would not work with this solution.
I use an Excel spreadsheet to calculate the values needed and printed a chart for easy reference. I have however heard such a calculation works for one crossover, but that multiway xovers change the math and then it gets really complicated. I think Minidsp would suit my four way open baffles better.
Insertion loss is handled through use of a couple of OEP brand transformers. Transformers work great if the preamp has enough clout. I imagine a passive preamp for example would not work with this solution.
I use an Excel spreadsheet to calculate the values needed and printed a chart for easy reference. I have however heard such a calculation works for one crossover, but that multiway xovers change the math and then it gets really complicated. I think Minidsp would suit my four way open baffles better.
I want to know commercial products in this kind - the only that I found on the web is this:
http://vinylsavor.blogspot.com/2020/04/the-passive-line-level-crossover.html
https://www.marchandelec.com/xm46-pllxo.html
Thanks for advices.
http://vinylsavor.blogspot.com/2020/04/the-passive-line-level-crossover.html
https://www.marchandelec.com/xm46-pllxo.html
Thanks for advices.
Passive line level crossover works best when buffered.
Like this:
https://www.diyaudio.com/community/threads/simple-active-crossover.368702/page-4
Like this:
https://www.diyaudio.com/community/threads/simple-active-crossover.368702/page-4
Passive line level crossover works best when buffered.
Like this:
https://www.diyaudio.com/community/threads/simple-active-crossover.368702/page-4
If you refer to post #62 of that thread: what is passive about it? The lower section is a second-order Sallen and Key active low-pass filter and the upper section essentially doesn't filter.
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