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Rather long Speaker wire lenth vs Gauge


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robb420in323 
Copper - Posts: 101
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Joined: July 13, 2004
Location: Ontario, Canada
Posted: May 23, 2005 at 8:40 PM / IP Logged  
Hi everyone. I was wondering how thick of speaker cable should I use for a 55Ft run..
The load will be 225watt Max @8 ohms
Thank you in advance.. I looked thru all the calculators. but i couldnt find the speaker table.
Robb
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stevdart 
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Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: May 23, 2005 at 10:01 PM / IP Logged  

Use Ohm's Law to find amperage I = sq rt (P / R ).  225 / 8 = 28.  The square root is 5.3.  So 5.3 amps is the current the wire has to be able to carry.  Not much, due to the high impedance and low wattage.

Here's a great calculator for that.  You can see that with using 16 gauge wire the decibel loss is less than half a decibel, which is an inaudible result.

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sedate 
Silver - Posts: 1,173
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Posted: May 23, 2005 at 10:10 PM / IP Logged  
55ft run?  What? are you doing?
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Poormanq45 
Silver - Posts: 597
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Joined: October 27, 2004
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Posted: May 24, 2005 at 9:42 AM / IP Logged  
For that long of a run go down one, possibly two for safety, guages.
To be safe I'd go with 12awg
Francious70 
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DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: May 24, 2005 at 9:51 AM / IP Logged  
Stevdart is correct.  No need to use anything larger than 16 AWG.
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