What does this do?

admin · Post by **b0b** » 5 Jan 2019 1:22 pm

It's a "Stereo Adapter". Huh? There's no mono input. What does it do?

https://www.sweetwater.com/store/detail ... io-1176-sa

Jon Light · Post by **Jon Light** » 5 Jan 2019 1:49 pm

There is an RCA jack on the back of an 1176 compressor/limiter. I'm guessing that you go from two 1176's to the two jacks on the gizmo to tie together two mono units into stereo.

Henry Brooks · Post by **Henry Brooks** » 5 Jan 2019 2:56 pm

I think what it does is combine the two signals to control the gain/compression for both channels. If you didn't do that the stereo image would shift right and left because one channel would be louder than the other. The combined signal makes the gain/compression the same in both channels.
Henry

Bryan Daste · Post by **Bryan Daste** » 5 Jan 2019 3:22 pm

Yep, it links the compressors together so that they will behave in an identical fashion. Good for stereo material. If unlinked, each compressor will respond only to its own signal, so you could start to hear the stereo image move around if one side has a louder signal than the other.

admin · Post by **b0b** » 5 Jan 2019 3:57 pm

How does it do that? Is it an audio signal from each compressor? I really don't understand. Where does the output go?

Greg Cutshaw · Post by **Greg Cutshaw** » 5 Jan 2019 4:05 pm

See page 27 of this manual:

https://media.uaudio.com/assetlibrary/1 ... manual.pdf

"With the use of an external 1176 Stereo Adapter (1176SA), available from Universal Audio, two 1176LNs can be connected for stereo operation."

admin · Post by **b0b** » 5 Jan 2019 5:46 pm

Thanks, Greg. I think I understand what it does now. I just don't understand how it does it.

Godfrey Arthur · Post by **Godfrey Arthur** » 5 Jan 2019 7:17 pm

b0b wrote:I just don't understand how it does it.

It's an electronic link. Has to do with voltages. Only works with a matching unit. Can't tether two units of different brands/models.

An FET is used as a variable resistor, acts like a resistor whose resistance is controlled
by the voltage applied to its gate. So using the adapter and calibrating the two mono units (there is a set up process getting the meters to read zero) when connecting it ties these two gain reduction circuits.

Adjust the potentiometer on the 1176-SA until both meters read 0dB

What linking does is it connects both peak limiters to one set of controls.

Instead of having this:

Link two in stereo electronically using UA's basic linking circuit.

One would have to understand the electronics of the circuit to even begin explaining it.

admin · Post by **b0b** » 5 Jan 2019 10:28 pm

So, even though they look like audio cables, they're actually balanced signal voltages?

Godfrey Arthur · Post by **Godfrey Arthur** » 5 Jan 2019 11:11 pm

b0b wrote:So, even though they look like audio cables, they're actually balanced signal voltages?

They are RCA connectors and there's a ground lug on the box.

Instructions says requires two RCA style cables.

S/PDIF connectors are RCA but designed to carry digital information so audio is not the only use for an RCA plug.

It appears the adapter just links the two limiters together and any audio goes through the regular in/outs on the limiters themselves.

Michael Brebes · Post by **Michael Brebes** » 6 Jan 2019 5:55 am

The signals present are actually gain control voltages, not actual audio signals.

admin · Post by **b0b** » 6 Jan 2019 9:01 am

I wonder if each cable carries two signals, one for attack and the other for release. Real curious about how this works.