| Re: 100W resistor in 3Pi crossover [message #77396 is a reply to message #77395] |
Sat, 03 August 2013 10:33   |
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Wayne Parham
Messages: 18695
Registered: January 2001
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Illuminati (33rd Degree) |
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See page 66 of the following document:
That shows the voltage across the Zobel resistor, which then lets you know the power dissipation required of this part. The drive voltage to get to this point is 70v peak, which is 50 volts RMS, equivalent to about 300 watts across an 8Ω load.
What you should take from this is that component needs to be able to handle at least 1/3rd the amount of power applied. So for example, if you use a 10 watt part in this position, your speaker is safe to about 30 watts continuous power. It can handle higher peaks than that, and it is only vulnerable in the upper midrange, around 1kHz. But those are the facts. It can't handle more than about 3x the power that resistor is rated at 1kHz, and should be considered vulnerable from 500Hz to 3kHz.
My suggestion would be to order the right part and install it when it gets here. In the meantime, you can install a smaller part in that position, and derate the loudspeaker accordingly. Just go easy on the power knob 'til you get the right part.
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