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-   -   Capacitors for high powered crossover (http://www.talkbass.com/forum/f38/capacitors-high-powered-crossover-1014648/)

 xander8280 09-12-2013 12:50 AM

Capacitors for high powered crossover

Just want recommendations on what 400v or 500v rated big ol' caps to get? I'll be using 200 watts max on this, what voltage rating is safe?

Thanks, no idea what caps to get of mouser.

 Rune Bivrin 09-12-2013 01:06 AM

Assuming 8 ohms, max voltage it should be exposed to is around 40 volts. I'd say 100 volts is plenty, and 400 volts is ridiculous and expensive.

 xander8280 09-12-2013 02:28 AM

Cool!

 line6man 09-12-2013 03:06 AM

Multiply the impedance by the wattage and then take the square root of that product, and you'll know where the voltage range is going to be.

 xander8280 09-12-2013 03:27 AM

Quote:
 Originally Posted by line6man (Post 14856960) Multiply the impedance by the wattage and then take the square root of that product, and you'll know where the voltage range is going to be.
Now I know the equation, thank you!

 megafiddle 09-12-2013 04:53 PM

That calculation gives you RMS voltage. The peak signal voltage is 1.414 times that amount for a sinewave.
So I would at least double the result. 100V works out as a good value.

I assume you know you need a nonpolar cap.

...

 xander8280 09-13-2013 08:16 AM

Quote:
 Originally Posted by megafiddle (Post 14859997) That calculation gives you RMS voltage. The peak signal voltage is 1.414 times that amount for a sinewave. So I would at least double the result. 100V works out as a good value. I assume you know you need a nonpolar cap. ...
Yes, I was going to go for 150v if I run the cab with my more powerful head.

Good to know the peak signal voltage!

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