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How to wire a mono speaker to a stereo output?
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Doctorgun
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#1
19th August 2013
Old 19th August 2013
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How to wire a mono speaker to a stereo output?

I have a proco switch witch monitor switcher. I'm super happy with its clean monitor switching ability.

I want to add a small, mono speaker to my set up, something like the avantone mixcube. I know I can just wire it to the left or right output on one of the switch witch channels, and hit mono in my daw, but I was hoping i could somehow simply sum the left and right outputs of one of the channels to mono so I don't have to hit the mono button.

Is it as easy as making a dual female to single male xlr cable?

Thanks friends!
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19th August 2013
Old 19th August 2013
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I think it's as simple as a custom made 2to1 cable, with four (2k2?) summing resistors inside.
Leo..
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19th August 2013
Old 19th August 2013
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Quote:
Originally Posted by LeeYoo View Post
I think it's as simple as a custom made 2to1 cable, with four (2k2?) summing resistors inside.
Leo..
Any idea where I would find a diagram for such a thing?
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19th August 2013
Old 19th August 2013
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You can't sum the outputs , doing so could fry your amp , what you have to do is sum the inputs to mono through a couple low value resistors then split that summed signal to the left and right inputs of the amp then you will have a summed mono output coming out the left and right speakers ...
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19th August 2013
Old 19th August 2013
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never mind... I didn't recognize that speaker model was active...

simple passive resistor sum will work.

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Last edited by JohnRoberts; 19th August 2013 at 06:55 PM.. Reason: spelin and errir
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19th August 2013
Old 19th August 2013
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Quote:
Originally Posted by Doctorgun View Post
... want to add a small, mono speaker to my set up, something like the avantone mixcube. I know I can just wire it to the left or right output on one of the switch witch channels, and hit mono in my daw, but I was hoping i could somehow simply sum the left and right outputs of one of the channels to mono so I don't have to hit the mono button.

Is it as easy as making a dual female to single male xlr cable?

Thanks friends!
The O.P. mentioned the MixCube which is an active speaker with a balanced XLR input. There was no mention of summing a passive speaker so no low impedance resistive power summing is necessary.

As Leo already mentioned:
Ideally he needs to wire up a balanced resistive summer. A pair of XLR(F)cables each terminating in a pair of 2k resistors connected to a XLR(M) plug connected to the MixCube will do it.


Input XLR(F) No. 1 (Left channel)
pin-2 --> 2000 ohm resistor -->pin-2 Output XLR(M) No. 3
pin-3 --> 2000 ohm resistor -->pin-3 Output XLR(M) No. 3
pin-1 --------------------------->pin-1 Output XLR(M) No. 3

Input XLR(F) No. 2 (Right Channel)
pin-2 --> 2000 ohm resistor -->pin-2 Output XLR(M) No. 3
pin-3 --> 2000 ohm resistor -->pin-3 Output XLR(M) No. 3
pin-1 --------------------------->pin-1 Output XLR(M) No. 3

Best to place the (4) resistors near the summed output connector, rather than at the input connectors.

Two female XLR, (1) male XLR, (4) resistors
Resistive mono summing and no stereo separation loss. Done.

Avantone does not specify the input impedance of the MixCube, but it's probably in the 10K range. The MixCube also has plenty of gain. The summing/isolation resistor value is therefore not at all critical, and anything between 1k and 5k should work, as long as all (4) are the same value. Use 1% tolerance resistors if you can (for best noise rejection).

A "Y" cable as above will work if there are extra XLR outputs available for the main channels. If not, then the inputs obviously must be "tapped" into the existing L/R outputs.
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#7
19th August 2013
Old 19th August 2013
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I would get a small plastic box from my electronics store.
And connect three cut XLR leads and resistors in there.

You could also buy an XLR Y-cable.
http://www.amazon.com/XLR-M-XLR-F-Y-...ds=xlr+y+cable
Open the two identical plugs.
And solder 4 resistors inline with the hot pins/wires.
Leo..
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20th August 2013
Old 20th August 2013
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Thank you kindly!
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20th August 2013
Old 20th August 2013
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Just don't use the "Y" cable without the resistors. Otherwise you'll have "3-channel mono".
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20th August 2013
Old 20th August 2013
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