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making a harness line output to low rca


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gtr86 
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Location: Illinois, United States
Posted: January 30, 2015 at 1:51 PM / IP Logged  
Making a harness, Line output to Low RCA levels into an amp. I have a standard 50 Watt head unit and wanting the values of the resistors to reduce the input safely into a RCA Low Level input for an amp.
tonanzith 
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Joined: July 18, 2008
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Posted: January 30, 2015 at 2:13 PM / IP Logged  
Just curious why not pick up a loc 80 or equivalent?
Gary Sather
oldspark 
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Posted: January 30, 2015 at 4:01 PM / IP Logged  
Read up on resistive voltage dividers. (A series resistance x times the amp input's impedance where x is the desired reduction ratio. EG - 15-fold reduction into 10k inputs means a 150k resistor.)
gtr86 
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Posted: January 31, 2015 at 3:29 PM / IP Logged  
150K resistor at what wattage?
oldspark 
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Posted: January 31, 2015 at 4:29 PM / IP Logged  
Any Wattage. It'll be so small it doesn't matter.
NOTE that I am NOT saying a 150k resistor - that is an example only which is for speaker outputs to low signal levels, not line outs (which IM-inexperienced-O should be low enough anyway).
You have not given sufficient info for an answer. But FYI, the worst case Wattage for a 150k assuming 50W into 8 Ohms is ~3mW so even a 1/8W (125mW) resistor is more than enough. And it would be even less if dropping a Line Output.

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