Senior Member
Anyone familiar with audio over XLR?
I am making a standard stereo audio jack (headphone jack), to XLR cable. Since regular XLR is only for mono signals, I have been told that I can combine the left and right audio signals using ~220ohm resistors. Is this correct?
I believe once I have merged the audio channels, the merged output from the jack would go to pin 2 on the XLR, and the -/gnd of the audio would go to pins 1 and 2?
EDIT: Would even something like this work?
Cheers,
Dan
Last edited by Things; 03-31-2009 at 04:10.
Senior Member
There 2 different ways an XLR can be wired; either balanced or unbalanced site shows both configurations and explains the differences.
Doc's website
The Health and Safety Act 1971
Recklessly interfering with Darwin’s natural selection process, thereby extending the life cycle of dim-witted ignorami; thus perpetuating and magnifying the danger to us all, by enabling them to breed and walk amongst us, our children and loved ones.
Senior Member
Whether this would work would depend largly on the input impedence of the "driven" circuit. It would probably be fine driving a typical line input preamp, but no good driving say; a low impedence headphone load.
Doc's website
The Health and Safety Act 1971
Recklessly interfering with Darwin’s natural selection process, thereby extending the life cycle of dim-witted ignorami; thus perpetuating and magnifying the danger to us all, by enabling them to breed and walk amongst us, our children and loved ones.
Senior Member
It would be mainly for connecting a CD player or laptop to a mixer. The output from the headphone plug of the laptop and CD player is a lot higher than a line signal, but I believe that can be fixed just by keeping the volume on the source low.
Senior Member
Should be fine, most mixers can easily accept over a volt of input without wincing (so long as you don't choose a mic or phono level input!), also should have a reasonably high impedance. Just be aware, if it's a pro mixer; it may well have a balanced configuration (as per previous post).
Doc's website
The Health and Safety Act 1971
Recklessly interfering with Darwin’s natural selection process, thereby extending the life cycle of dim-witted ignorami; thus perpetuating and magnifying the danger to us all, by enabling them to breed and walk amongst us, our children and loved ones.
If its a high impedance input( such as a balanced in), you should be fine with a lot higher resistance.. Its probably safer if you do use a higher resistance..
to connect unbalanced to balanced, signal into pin 2(or 3) and ground the other input ( just like connecting single ended signal to differential scanner inputs ).. Depending on whether you use the - or + will determine whether the phase is reversed.. Not a big deal in your case matey..
Originally Posted by Things
I am making a standard stereo audio jack (headphone jack), to XLR cable. Since regular XLR is only for mono signals, I have been told that I can combine the left and right audio signals using ~220ohm resistors. Is this correct?
I believe once I have merged the audio channels, the merged output from the jack would go to pin 2 on the XLR, and the -/gnd of the audio would go to pins 1 and 2?
EDIT: Would even something like this work?
Cheers,
Dan
KVANT Australian projector sales
https://www.facebook.com/kvantaus/
Lasershowparts- Laser Parts at great prices
https://www.facebook.com/lasershowparts/
Posting Permissions
Reply With Quote
dave