09-25-2014 05:50 PM - edited 03-18-2019 03:27 AM
We are trying to connect a SX20 microphone port to the output of a Polycom soundstructure C12.
I'm wondering if anybody has been successful doing this?
It looks like the SX20 has to be tricked to believe its microphone is connected.
Maybe by sending some power on some pins?
I've seen several example on how to connect powered mics directly to the SX20 but the soundstructure output port is different and the codec keep the port shut when plugging it in.
Has anybody been able to connect a soundstructure or similar device to a SX20?
Thanks
09-26-2014 12:37 AM
Could it be, that you´ve used a 3pin 3,5mm plug instead of the needed 4pin jack? This would shorten the mute pin on SX20.
09-26-2014 09:16 AM
We are using a 4pin 3.5mm and tried almost any wiring combination possible.
When looking at the volume meter under the SX20 admin settings, the volume bar goes dead as soon as you disconnect the SX20 included mic.
We haven't been able to get that volume bar up when plugging to the Soundstructure C12, so it looks like the SX20 does some mic detection test and we are failing it.
I've read somewhere that pin 2 and 3 had to be shorted to trick the SX20 to detect the mic but that didn't work for us.
We are running TC 7.2 .
What version are you running?
I'm wondering if there is some mic detection code in that version that is tripping us.
Thanks
09-26-2014 09:44 AM
I'm on 7.1.4
12-12-2014 11:56 AM
We are still seeing this issue in 7.2.1.
12-13-2014 05:52 AM
Do NOT use the volume bar status! Go into the web browser and check audio input levels. There you will see your external miclevels. Very confusing. Can't believe this is not more published!!!
09-26-2014 11:54 AM
Something else I just realized, why won't audio work with a disconnected mic? If there *is* code doing this, its very bad code. Just because someone unplugs a mic doesn't mean the audio output should be disabled.
09-26-2014 12:05 PM
The audio output of the codec is not disabled, only the mic port is.
What we are trying to do is connect third party ceiling mics.
The Ceiling mics are connected to the soundstructure C12 and the C12 output port connected to the SX20.
We have no issues with the audio output from the SX20.
09-26-2014 12:09 PM
OK, that clears it up. You said volume bar, so I thought you meant the main volume. :)
09-29-2014 02:36 AM
As a test, you could try to connect a ceiling mic directly to the SX20 using an external phantom power supply or a dynamic microphone to see, if the issue is related to the soundstructure.
10-07-2014 05:54 PM
have you or anyone you know gotten any external mics to work with the sx20?
11-06-2014 02:12 PM
Were you able to get this working with the SoundStructure? We are doing something similar with a BiAmp, but to four SX20's.
We have wired the output to the four-position jack, and still get a warning about the mic not being detected.
Thanks in advance!
09-26-2014 04:50 AM
I have connected ClearOne Interact systems to the SX20 with no ill effect. I'm using a male-3.5mm 3 conductor (SX20) to female RCA adapter (ClearOne). Even though its not a 4 conductor 3.5mm, it works just fine.
I do have some 4 conductor connectors, I just haven't soldiered them yet.
10-16-2014 03:20 PM
We finally got it to work by turning off HDMI audio.
10-30-2014 04:16 AM
Hello
when you say 'turning off HDMI audio' would this be on the input side?
We were only able to get this working with a third party microphone on V7.1.4 by connecting the Cisco microphone to enable microphone input and then using input 2 for the third party microphone.
Thanks
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