Maybe not the most compact option but you can just use a stereo to mono 
transformer such as a Speco TSM-30
http://www.lashen.com/vendors/CSISpeco/Speakers/Transformers.asp

Steve P.

----- Original Message ----- 
From: "DCFluX" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, December 30, 2004 10:48 AM
Subject: [Repeater-Builder] Speaker Level Mixing


>
> Anyone had experience with mixing the speaker output of 2 radios, Say
> Motorola GM300's to one speaker?
>
> I originally tried a couple of resistors but I may have the wrong
> values as they got hot as hell and one started smoking, I was using 2
> .82 ohm at 2 watt resistors for each radio, one resistor in each
> speaker lead and at the center the speaker.  My next best guess is
> using a multiple winding transformer with three windings of 4 ohms,
> but finding information on how to wind a transformer to do that is
> impossible these days.  Any Ideas?
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> 





 
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