Best way to convert Bal Stereo to Bal Mono ?
Posted: Fri Feb 19, 2016 2:55 pm
How to properly convert the balanced stereo output from a mixer to a balanced mono signal ?
I've been having a discussion with another guy about this topic...
He suggested a 3-resistor circuit...
+Left -------------- +Mono
|
R1
|
+Right---
|
R2
|
-Left----
|
R3
|
-Right ------------- -Mono
All resistors are 600 ohms.
My concern is that without knowing the particulars of the driving circuits... and without knowing the particulars of the circuit we will be driving... a simple passive circuit could modify the frequency response and/or distortion of the audio.
In our case the circuit will be driven by the output of a stereo mixer and the output will be connected to the EAS system and then to the input of our audio processor.
My suggestion was to treat the two signals as you would treat any two separate audio sources and put them through a simple two channel mixer that would mix the two balanced audio signals into a single balanced audio signal.
Of course if you assume the driving circuit is a low impedance circuit like a complimentary pair in the output of an op-amp... and that the circuit the restive "combiner" was driving was a high impedance input... then the resistors may work... but assumptions have always made me worry
What do you guys think? How do you do this?
Thanks for any comments.
I've been having a discussion with another guy about this topic...
He suggested a 3-resistor circuit...
+Left -------------- +Mono
|
R1
|
+Right---
|
R2
|
-Left----
|
R3
|
-Right ------------- -Mono
All resistors are 600 ohms.
My concern is that without knowing the particulars of the driving circuits... and without knowing the particulars of the circuit we will be driving... a simple passive circuit could modify the frequency response and/or distortion of the audio.
In our case the circuit will be driven by the output of a stereo mixer and the output will be connected to the EAS system and then to the input of our audio processor.
My suggestion was to treat the two signals as you would treat any two separate audio sources and put them through a simple two channel mixer that would mix the two balanced audio signals into a single balanced audio signal.
Of course if you assume the driving circuit is a low impedance circuit like a complimentary pair in the output of an op-amp... and that the circuit the restive "combiner" was driving was a high impedance input... then the resistors may work... but assumptions have always made me worry

What do you guys think? How do you do this?
Thanks for any comments.