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Balanced stereo in/ balanced mono out

J

jboyd

I need an active device to match above...have tried passive networks and they are not satisfactory. The active ones on the market (few) are too SSS. Any suggestions? Thanks JBI
 
You may have stumped us. I know the Ariane Sequel leveler will do that but it ain't cheap.$ 2600 +.
Don't think Henry eng or Broadcast tools has anything.Maybe someone will chime in.good luck.
 
How about a small mixer? Mackie, Behringer, Yamaha, Alesis and others come to mind. Most have pads and gain trim controls on the XLR inputs and have enough headroom to take a line level source. If headroom is a problem a passive in line XLR pad can be purchased or if you are handy, they are easy to make.
 
How many do you need in one location?
Leitch has a Programmable DA, the APD-880, that can be set to sum stereo to mono, and make 8 outputs, or do a combo with some mono and some stereo outputs.........mix-and-match style.
You need a tray and the power supplies, so you'd have have room for up to 12 DA's of various types in one spot.
 
Thanks for the replies:
I am going with the sonifex because of the reviews...However, I am going to try the passive
network. too. JBI
 
You can use a pair of 1:1 transformers. Left goes in the primary of one, Right goes into the primary of the other. Wire the secondaries in SERIES and you will get a mono mix. You must use two transformers.
 
Isn't what you're describing easily accomplished with a simple summing amp (aka a mixer)? I could design something using one TL074 and one NE5532 in about 10 mins. Seems like one of the RDL "stick on" mixers would do the trick very inexpensively, though. The advantage to doing this with an active circuit is there's no induced cross talk between left and right. Passive methods will usually involve some degree of cross contamination.
 
Bill DeFelice said:
I've used the lattice splitting pad as described in Radio Systems' Technical Bulletin No: 1101 (PDF). I've never had any problems using this circuit.
Click to expand...

This is an nice passive circuit that works well and can be built very neatly with a hobby box, a solder gun, some heat-shrink tubing, and you're off to the races. We have several in use. This is a $5 solution that works very well, plus does not add another point of potential system failure as with active electronics.

With most modern electronics using JFET OpAmps - Impedance mismatching is not an issue.
 
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