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Old 10th August 2011, 03:09 AM   #1
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Default car stereo connected to 32 ohm driver?

What would happen if I connect a 32 ohm headphone driver to a car stereo receiver rated for 2 to 4 ohms with 40w output? If it will detonate the rec can someone tell me what components are needed to stop the ensuing smoke cloud? Thanks.
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Old 10th August 2011, 03:21 AM   #2
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Ever watch the 1987 film "The Gate"? Gateway to hell is all I'm sayin'.

Actually, worst case is you fry your little driver with ~2W of power.
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Old 10th August 2011, 06:58 AM   #3
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What are you attempting to accomplish? Are you trying to add a headphone output to your head unit?
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Old 11th August 2011, 03:59 AM   #4
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OK, I know that headphone drivers use just millwatts of power, so 2w would melt things, but wouldn't the resistance of the drivers drop the wattage? It has been a long time since I studied the PIE triangle. And yes, Sofaspud, I am attempting to run headphones with a car (boat) stereo, on my motorcycle in the helmet to be exact. I posted the same question earlier, but got no useable response, so I tried again using fewer words. I am not using the 3 pole 3.5mm plug and jack, I found a source for a 4 pole 3.5mm plug and jack, so combining grounds isn't an issue any more. The output of the head unit is 40 watts for 2 to 4 ohms, the resistance of the drivers is 32 ohms. Thanks is advance for the help.
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Old 11th August 2011, 04:38 AM   #5
infinia is offline infinia  United States
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use an L pad to knock levels down to about 20dB or so, try 110 ohms series followed by10 ohm parallel wired across the headphone socket.
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Old 11th August 2011, 05:40 AM   #6
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Quote:
Originally Posted by scwten13 View Post
.... but wouldn't the resistance of the drivers drop the wattage?
Yes, down to around <2W with a 32-Ohm load.

2W is still way too much, so you need to make a voltage divider like infinia suggested.
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Old 11th August 2011, 01:28 PM   #7
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You should know that people won't look out for motorcycles. You need to be as aware as possible of your surroundings and having headphones (or audio in your helmet) will block out sounds that you really need to hear.
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Old 17th August 2011, 02:45 AM   #8
ppia600 is offline ppia600  United States
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You could also use a dual isolation transformer wound to get the ideal drop and prevent headphone obliteration.
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Old 18th August 2011, 03:42 AM   #9
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And how would I come across a dual isoaltion transformer?
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Old 18th August 2011, 09:18 AM   #10
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dumb question, but the reciever doesn't have rca out? and, what is the purpose of the driver? how much power does it drive to the headphones?
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