600 ohm
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Posted on May 04, 2009 10:09 pm
fren hie29
http://www.mpaudiovisual.com
Member Since: Jul 13, 2007
Could somebody explain to me what is 600 ohm load means in audio? Is it at the input?
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May 04, 2009 11:27 pm Fren hie! Where the hell have you been hiding all this time?
Either way, good to have you back.
The difference that you are looking for, and yes it is a difference. Is dBu, or dBm.
On some Opamps, you need a 600 ohm load for the Opamp to drive, or even turn on.
The other needs to see a 10K ohm load.
All this is for is setting up the gain structure in your preamp, or output.
The simplest explanation that I can give is, that high ohm load equals high gain.
For an example, a regular pair of headphones can not be plugged into a DVD output. But, a 600 ohm load headphones can.
Does that help at all?
fren hie29http://www.mpaudiovisual.comMember
Since: Jul 13, 2007
May 05, 2009 04:40 pm Hey Rob,
I knew you would answer that one ;)
For some reason I couldn't login here anymore I had another nickname that I used but I loged in with my old nickname and its working,
I haven't been around for a while studying electronics right now... pretty hard That's what I am trying to figure out the good ole 600 ohm audio line
Here's a link that I found
www.audiodesignline.com/s...cleID=196800735
What I don't understand is that 600 ohm doesn't dictate the impedance, does it mean that soon as the signal hits the audio input there's 600 ohm in resistance??
May 05, 2009 04:55 pm This came about because of Alexander Gram Bell. When he first made his telephone, he used .707, or the rms value of 1 volt to be the drive voltage.
Starting to see it now?
Because he used such a low voltage for the transmission, you need to have a high impedance in the line so that it will not oscillate. And it needs to be matched at both ends.
May 05, 2009 05:08 pm Oh, I didn't read the rest of the question all the way through. Sorry, I have the flu.=)
By having the impedance matched at both ends, the driver views the resistance as the 600 ohm load. Remember, impedance changes with frequency.
The line at a 1K tone will seem to be a 600 ohm load to the driver.