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Mix Minus Channels

P

pellmell

Most consoles I see, such as the AudioArts A3, have a single mix minus channel. If you're doing a talk show with a hybrid and Skype, you need at least two channels. When we do our talk-based webcasts, we use four mix minus channels in the form of Aux Sends on small format mixers. How are broadcasters integrating Skype and and other Internet-based technologies into the technical mix with only one mix minus?

You could externally switch the channel between a hybrid and Skype, but then a caller and a Skype caller would not be able to talk with each other. (I realize that Skype has echo cancellation that some people use for mix minus, but it's not reliable for that purpose.)
 
pellmell said:
Most consoles I see, such as the AudioArts A3, have a single mix minus channel.
Click to expand...

Most consoles I see (such as Axia iQ or Radius) have mix minuses automatically generated for each source!

With consoles so limited in mix-minus capabilities such as you describe, I'd use a second bus (PGM2 or Audition) or an AUX send to manually create a back-feed for Skype...


Regards,
Goran Tomas
 
Goran Tomas said:
Most consoles I see (such as Axia iQ or Radius) have mix minuses automatically generated for each source!
Click to expand...

That's definitely a great solution. I was obviously not aware that consoles were doing that.

With consoles so limited in mix-minus capabilities such as you describe, I'd use a second bus (PGM2 or Audition) or an AUX send to manually create a back-feed for Skype...
Click to expand...

We use aux sends and subgroups (when we run out of post-fader aux sends.)

A talk show host I'm helping wants to add Skype and Paltalk to his show, but his only mix minus is tied up with the hybrid. Now I'm wondering if his console might actually have automatically generated mix minuses, as you mention. He's in another state, so I can't just go check the studio. I'll find out what his console is. The station's engineer is an old fellow who doesn't like to do anything.
 
If you fancy building something, why not take the output off your desk plus the telco/skype feed - and flip the phase on it 180' and then combine the 2 - As it's mono, it should cancel it out and give you a nice mix-minus. You can do this for as many additional sources as you like 8)
 
Henry Engineering still makes a box that does exactly this. I have used them in the past to add mix-minus to Autogram consoles.

Bob
 
There are several ways to do this. Aux send, pgm2, etc.

Also, does the program feed from the board need to be stereo or mono? If mono, then wire all inputs to both left and right sides EXCEPT those that need the mix minus; wire those to the left side only. Use the left side as the program feed; use the right side as the mix-minus.

Works well. I did this very config on a board for an AM station.
 
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