Resistor power rating for XO?

JC Fardo · 15th December 2004, 07:34 PM

Hi

There´s 5 Watt and 12 Watt from Mills manufacurer, for example.

Which is best recommended for speaker crossover?

TIA

JC

Sch3mat1c · 15th December 2004, 09:08 PM

...How many watts is the speaker/amplifier...

Tim

JC Fardo · 16th December 2004, 09:04 AM

Thanks Tim

80W RMS/ CHANNEL solid state

JC

richie00boy · 16th December 2004, 10:35 AM

Firstly, it won't hurt to have more power rating than you need, unless it means going to a wirewound type which could possibly be inductive.

To work out the rating you assume a 4 or 8 ohm load as appropriate for your speaker, then just use ohms law to work out the current in the resistor at full output. Then you simply square the current and multiply by the resistor value to get the required wattage.

ohms law is V = I x R

or in your case rearranged as I = V / R

markp · 16th December 2004, 07:52 PM

If it is in the tweeter circuit then a 12 watt Mills will be overkill. A wirewound resistor will take 10 times its rated power in a peak no problem!

15th December 2004, 07:34 PM	#1
JC Fardo diyAudio Member Join Date: Jun 2002 Location: Sao Paulo, SP, Brazil	Resistor power rating for XO? Hi There´s 5 Watt and 12 Watt from Mills manufacurer, for example. Which is best recommended for speaker crossover? TIA JC

15th December 2004, 09:08 PM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	...How many watts is the speaker/amplifier... Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

16th December 2004, 07:52 PM	#5
markp diyAudio Member Join Date: Oct 2003 Location: L.A., CA	If it is in the tweeter circuit then a 12 watt Mills will be overkill. A wirewound resistor will take 10 times its rated power in a peak no problem! __________________ If it sounds good... it is good!

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16th December 2004, 09:04 AM	#3
JC Fardo diyAudio Member Join Date: Jun 2002 Location: Sao Paulo, SP, Brazil	Thanks Tim 80W RMS/ CHANNEL solid state JC

16th December 2004, 10:35 AM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Firstly, it won't hurt to have more power rating than you need, unless it means going to a wirewound type which could possibly be inductive. To work out the rating you assume a 4 or 8 ohm load as appropriate for your speaker, then just use ohms law to work out the current in the resistor at full output. Then you simply square the current and multiply by the resistor value to get the required wattage. ohms law is V = I x R or in your case rearranged as I = V / R

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