I bought these but haven’t had a chance to try them yet. They are well made with quality components in USA. Of course, if you are not into opamps, these might not be your cup of tea.
https://www.xkitz.com/collections/a...-way-active-crossover-fully-assembled-xover-2
Manual with measurement graphs and schematics here:
http://www.xkitzconnect.com/files/XOVER-2_Instr_Manual_Rev_5_2.pdf
https://www.xkitz.com/collections/a...-way-active-crossover-fully-assembled-xover-2
Manual with measurement graphs and schematics here:
http://www.xkitzconnect.com/files/XOVER-2_Instr_Manual_Rev_5_2.pdf
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I sugest you read the thread, it has info about jfets many times.
The stuff you marked ? Is capacitor, generic, use common sense.
Calculations are well explained on dave's pages.
https://www.t-linespeakers.org/tech/filters/passiveHLxo.html
https://www.t-linespeakers.org/tech/filters/passiveHLxo.html
Voltage i use is stabilized +/_15 volts, but i used anything from +/_12 to +/_18 and it worked. I would not go higher, as jfets have limits.
Jfets so can be LSK170 and Lsj74? In any position?
Yeah, I figured they must be capacitors, but why is not their value written in the schematic? Can the have any value?
I bought a pair of these about a year ago, crossover at 1khz but haven’t put them into use for any real project yet. I was going to try a biamp setup with my Aleph J on top and M2 on bottom and I believe they have a gain setting on them but can’t say for sure. I did play with them initially just to see if they work. They were dead quiet and was pleased but as with so many other projects I’d like to get going I haven’t had the time ☹️.I bought these but haven’t had a chance to try them yet. They are well made with quality components in USA. Of course, if you are not into opamps, these might not be your cup of tea.
https://www.xkitz.com/collections/a...-way-active-crossover-fully-assembled-xover-2
Manual with measurement graphs and schematics here:
http://www.xkitzconnect.com/files/XOVER-2_Instr_Manual_Rev_5_2.pdf
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Works better in the morning.
if C is chosen to be 0.1uf (based on what?)
R1=1/2πfC = 1/(2 x π x 150 Hz x 0.0000001uF)= 10Kohm.
Being buffered, is it sensitive to amplifier impedance like the PLLXO this page?
https://www.t-linespeakers.org/tech/filters/passiveHLxo.html
"We must consider the R of the amplifier so:"
If not, then the rest of the calculations does not make sense.
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That is the problem of passive crossover. If you change amplifier, you may get shift in crossover frequency.
No longer problem in active crossover.
No longer problem in active crossover.
But this XO is active "enough" to be able to ignore the amplifiers input impedance, at least when calculating the R-C filter?
Then it is most likely my dream XO you have designed here. Great job!
1. I am going to assume that the mystery generic caps can be 0.1uF as well. 🙂
2. About Jfet matching, is it only each pairs or all six or even all twelve Jfets that needs close matching?
3. Nelson swears by bi-polar cap on input and output. Any need for such protection here? I see some caps there already.
1. I am going to assume that the mystery generic caps can be 0.1uF as well. 🙂
2. About Jfet matching, is it only each pairs or all six or even all twelve Jfets that needs close matching?
3. Nelson swears by bi-polar cap on input and output. Any need for such protection here? I see some caps there already.
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1. Feel free to chage it. And recalculate for new resistor. Its not generic, just optimal for given frequency.
2. Just pairs is enough.
3. We select bipolar only if level is big enough to justify bipolar. I built many B1 buffers and his crossovers, and Mr. Nelson always uses mp cap when possible. I do not use input cap, because all my signal sources are well behaved and do not have dc.
Outputs are already cap coupled. No worries there. If it makes you feel better, use bipolar for low pass. I often do.
2. Just pairs is enough.
3. We select bipolar only if level is big enough to justify bipolar. I built many B1 buffers and his crossovers, and Mr. Nelson always uses mp cap when possible. I do not use input cap, because all my signal sources are well behaved and do not have dc.
Outputs are already cap coupled. No worries there. If it makes you feel better, use bipolar for low pass. I often do.