TalkBass Forums Capacitors for high powered crossover

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#1
09-12-2013, 12:50 AM
 Registered User Join Date: Dec 2011
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.
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#2
09-12-2013, 01:06 AM
 Registered User Join Date: Oct 2006 Location: Huddinge, Sweden
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.
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#3
09-12-2013, 02:28 AM
 Registered User Join Date: Dec 2011
Cool!
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#4
09-12-2013, 03:06 AM
 Registered User Join Date: Jun 2008 Location: Close to Los Angeles, CA
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.
#5
09-12-2013, 03:27 AM
 Registered User Join Date: Dec 2011
Quote:
 Originally Posted by line6man 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!
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MESA/Boogie Bass 400+
Acoustic 301 Cab
#6
09-12-2013, 04:53 PM
 Registered User Join Date: May 2011
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.

...
#7
09-13-2013, 08:16 AM
 Registered User Join Date: Dec 2011
Quote:
 Originally Posted by megafiddle 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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MESA/Boogie Bass 400+
Acoustic 301 Cab

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