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Old 15th December 2004, 07:34 PM   #1
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Default 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
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Old 15th December 2004, 09:08 PM   #2
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...How many watts is the speaker/amplifier...

Tim
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Old 16th December 2004, 09:04 AM   #3
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Thanks Tim

80W RMS/ CHANNEL solid state

JC
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Old 16th December 2004, 10:35 AM   #4
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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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Old 16th December 2004, 07:52 PM   #5
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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!
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