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Resistors, inductors and crossover capacitors have no polarity. If you have a cap that's marked +/- it's not suitable for crossover use.
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Hi All,
I am done with my Tarkus build. Cabinets are drying in the workshop after staining. Now in the process of building the crossovers. I have a question. I noticed on Paul's crossover schematic, there is no indication on how to solder up the resistors, capacitors and inductors. I understand there is polarity that I need to consider otherwise the crossover won't work properly.
I understand about reversing the polarity of the connectors for the mid speaker and tweeter. But do I need to worry about the components when soldering them together? How do I tell which direction I should solder the terminal wires for the resistors and capacitors? Thanks in advance.
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Electronics Tutorial about Resistors in Parallel with Parallel Resistors Connected Together and Resistors in Parallel Combinations
Not to confuse you. If you want to replace two 10 ohm resistors wired in parallel, with one resistor, a 5 ohm resistor is called for. So, "cutting the resistor quantities in half" will leave you with incorrect values.
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Paul's saying that instead of PAIRS for resistors R1, R2, R3, and R4 (made from 10n(ohm), 16n, 9.1n, and 25n resistors),
you can just use a single (10w min.) 5n, 8n, 4.7n(I'd go with a 5n), and 12n resistors.
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As I mentioned, I really have no idea about the components of a passive crossover.
So, if I just order what's on the list, except cutting the resistor quantities in half, I'll be good. Right ?
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Originally posted by Chris Roemer View PostBetween 2010 (orig. release) and 2017, the DX25 tweeter changed from mod "09" to "59", and Paul felt a need to update the XO.
The above BOM IS based on the updated XO, but ...
Today, I'd certainly feel free to use Dayton's inductors rather than Jantzen (at a co$t $avings).
I also see no need to use an npe cap (electrolytics "dry out" over time) for a value as small as 4.7uF (or possibly even 12uF?).
Also, that BOM LOOKs to have all the resistors "doubled up" (for power-handling). Paul MIGHT have suggested this initially, but I doubt that the L-pad on the tweeter would need this (it's probably even overkill on a band-passed midrange).
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Between 2010 (orig. release) and 2017, the DX25 tweeter changed from mod "09" to "59", and Paul felt a need to update the XO.
The above BOM IS based on the updated XO, but ...
Today, I'd certainly feel free to use Dayton's inductors rather than Jantzen (at a co$t $avings).
I also see no need to use an npe cap (electrolytics "dry out" over time) for a value as small as 4.7uF (or possibly even 12uF?).
Also, that BOM LOOKs to have all the resistors "doubled up" (for power-handling). Paul MIGHT have suggested this initially, but I doubt that the L-pad on the tweeter would need this (it's probably even overkill on a band-passed midrange).
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Ohhhh
Come on. Nobody can verify the BOM for this speaker build?
I'm new to the whole passive crossover idea and just want to make sure I get all of the correct components.
Thanks
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I'm really interested in building these speakers.
Is the BOM, in Post # 197 above, correct at this time ?
If not, what changes are necessary?
Thanks all.
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Thanks Paul for the kind words.
I thank you for bringing this beautiful and practical design for all aspiring speaker builders.
regards
prasi @ diyaudio
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They look so good! I'm really impressed with the custom XO boards. Wish I had that talent.
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hello everyone,
I hadnt updated my build. The build is completed long ago. They are wonderful be it for music or movies. I dont feel the need for a subwoofer.
In case anyone wants to build x-over on a PCB, I have some with 70um copper thickness (last 8 remain) . They are universal and can take almost all general component sizes.
Here is my build thread and some pics including pcbs.
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Originally posted by Chris Roemer View PostYES. YOU have the correct part # for the npe cap you seek.
(Not sure if that's Paul's list or not, but) that BOM list has at least 1 other error on it.
#027-432 LOOKs like it's currently a 12uF poly to me. (I did NOT look at schematic, so don't know if a 12 or 15 is correct?)
The latest schematic I could find is from 2016 on Paul's site.
If there is any new info I would appreciate it.
Thanks again!Home > Floorstanding Speakers > Tarkus
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