I posted this the other day and the post disappeared. I'm looking for a 2.4µF non-polarized cap to protect a tweeter and Google isn't helping me. I suppose I could consider two 1.2µF wired in parallel?
I believe the closest (common) standard NP cap value is 2.2uF. You could use a 2.2uF NP in parallel with a 0.22uF of another type, such as Polypropylene or Film/Foil.
Or you could use any combination in parallel that adds to 2.4, such as 1.2 + 1.2 as noted.
Or you could use two 4.7 uF in series.
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Electros will typically have a ±10% or ±20% tolerance range, so 2.4µF no matter what combination it is made of could result in anything from 2.16 to 2.64, or 1.92 to 2.88 respectively.
Better to use polypropylene, e.g. a Dayton DFFC ±1%, e.g. 1.0µF // 1.5µF, which will give you a value of 2.47µF to 2.53µF, or 2.0µF // 0.47µF, which will give you 2.45µF to 2.49µF.
An electro is a poor choice for a tweeter anyway.
https://www.daytonaudio.com/search?searchterm=pmpc
Better to use polypropylene, e.g. a Dayton DFFC ±1%, e.g. 1.0µF // 1.5µF, which will give you a value of 2.47µF to 2.53µF, or 2.0µF // 0.47µF, which will give you 2.45µF to 2.49µF.
An electro is a poor choice for a tweeter anyway.
https://www.daytonaudio.com/search?searchterm=pmpc
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I did not badmouth electros, just mentioned that there is a better tool for the job in hand. Saying that a milk truck is a poor choice for a race track is not badmouthing milk trucks - a milk truck is still a better choice than a sports car for delivering milk!
'An electro is a poor choice...' does not sound like praise.
However crossover use designed back to back electrolytic caps (non polar) are surprisingly good sounding. And cheap.
What have you got against using the appropriate tool for the job? The OP (rightly or wrongly) specified a precision value, indicating that their objective was precision or performance, in precedence to cost.
If the objective is low cost then by all means choose an appropriate design of electrolytic capacitor for a loudspeaker crossover and select the values on test (which would mean discarding a large number of components that didn't meet the required specification, somewhat defeating the cost advantage). Even I occasionally use an electrolytic capacitor as a seres component for a tweeter if I have no intention of keeping the loudspeaker, e.g. if it is being given away and the crossover quality is commensurate to the quality of the loudspeaker system.
To go further, it astounds me that loudspeaker designers who use polypropylene capacitors in series coupled positions often still use electrolytic capacitors in shunt positions in their crossovers. In both positions the component has implications for sound quality, and in my humble experience the quality of shunt capacitors in loudspeaker crossovers is equally important to series components. That's great for DIYers as it presents opportunities for simple, cost effective loudspeaker upgrades without resorting to audiofoolery.
If the objective is low cost then by all means choose an appropriate design of electrolytic capacitor for a loudspeaker crossover and select the values on test (which would mean discarding a large number of components that didn't meet the required specification, somewhat defeating the cost advantage). Even I occasionally use an electrolytic capacitor as a seres component for a tweeter if I have no intention of keeping the loudspeaker, e.g. if it is being given away and the crossover quality is commensurate to the quality of the loudspeaker system.
To go further, it astounds me that loudspeaker designers who use polypropylene capacitors in series coupled positions often still use electrolytic capacitors in shunt positions in their crossovers. In both positions the component has implications for sound quality, and in my humble experience the quality of shunt capacitors in loudspeaker crossovers is equally important to series components. That's great for DIYers as it presents opportunities for simple, cost effective loudspeaker upgrades without resorting to audiofoolery.
WHO mentioned race tracks?
The OP specifically asked for a milk truck to participate in a milk truck race so why despise them?
Or suggest anything different?
Thanks Juan, although I suspect most people will have no difficulty understanding my analogy. I wonder if you intentionally misrepresented the meaning of my post to promote your own value judgements?
My question to you is: When there is a more appropriate component available, both in regards to the application and the precision required, why not use it?
My question to you is: When there is a more appropriate component available, both in regards to the application and the precision required, why not use it?
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Two Solen 1.2uf film caps in parallel are my vote. Relatively cheap, accurate, and last forever. They sound way better than an electrolytic cap too.
Omitting the remainder of that sentence is what I call citing incorrect with a certain intention.
Correcting my laziness...
'An electro is a poor choice for a tweeter anyway'
Still does not sound like a praise, exactly the same meaning.
Full sentence was just few posts above, available, not hiding.
What is your intention?
Thanks for all the replies. One last dumb question ... since it appears I'm headed toward polarized, after wiring them in parallel how is it configured in the circuit? So which "direction" would a polarized cap go?
Originally the tweeter came with the cap wired in series on its positive lead.
Originally the tweeter came with the cap wired in series on its positive lead.