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Old 7th October 2015, 05:57 PM   #1
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Default Noob question about DIY speakers and crossovers

I have a quick question and I wasn't sure which category to post in. When someone designs a crossover what is the reason, for example, to use 2 = 12ohm resistors in parrallel to achieve 6ohm instead of just using a 6ohm resistor. I have seen this in several of the DIY speaker designs out there. Thank you for your time.

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Old 7th October 2015, 06:22 PM   #2
Mooly is online now Mooly  United Kingdom
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The first thing that comes to mind is that it allows a lower wattage part to be used.

e.g. 6 ohms and say 6 volts across that resistor needs a 6 watt part (V squared divided by R). Using 12 ohms allows a 3 watt part to be used.
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Old 7th October 2015, 06:28 PM   #3
wg_ski is offline wg_ski  United States
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And the case temperatures will be lower, with less tendency to cook the board and surrounding components.
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Old 7th October 2015, 07:11 PM   #4
Einric is offline Einric  United States
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Also if you need an oddball value, you can parallel 2 different value resistors and gain the extra dissipation while also hitting your oddball target value.
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Old 7th October 2015, 09:47 PM   #5
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So it is not done to necessarily have an impact on sound, but more to achieve a target value or reduce heat. That is what I kind of assumed but just wanted to make sure. Thank you all for such quick replies.
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