tec pro comms issue

[CARWYN]

Hi Guys and Gals

im having a couple of issues with the show relay in the building and am after a wiring diagram for our system we have a master station ms721 and loudspeaker stations ls411 it sounds like its powering up but not really getting sound out of them and narrowed it down to the wiring between the base station and the loudspeaker station so what im after is the wiring diagram to go from an xlr into the loudspeaker stations

 

Thanks

Carwyn

ms721 nad ls411

[paulears]

The terminals are labelled 1,2 and 3 on mine - the same as the pin numbers on the XLR. The you say it's 'Not really getting sound out" - I don't quite understand. If the comms line is intermittent it crackles badly, and if the comms line has shorts or hi-res joints they tend to be a bit unstable. If the power line is dodgy, then nothing tends to work. Can you explain exactly what the problem is, and if you have many loudspeaker stations, are they all suffering the same thing?

[CARWYN]

The terminals are labelled 1,2 and 3 on mine - the same as the pin numbers on the XLR. The you say it's 'Not really getting sound out" - I don't quite understand. If the comms line is intermittent it crackles badly, and if the comms line has shorts or hi-res joints they tend to be a bit unstable. If the power line is dodgy, then nothing tends to work. Can you explain exactly what the problem is, and if you have many loudspeaker stations, are they all suffering the same thing?

 

hi theyre all suffering the same thing they all pop on when you power on the base station then you can hear the distand hummy quiet type of sound but nothing else really. on the connector block on the inside of mine it has R L L X one letter to every hole if anyone can let me know what that corolates to in pin numbers on the xlr that would be great. but all panels do the same pop on then the faint buzzing type sound then if you crank the line volume into the base station so its stupidly loud you can hear some show really verry quietly but thats about it and on the comms it comes through really loud so you cannot hear eachother talk

 

Thanks

Carwyn

 

Hi Guys

A Bit of an update

I am now convinced my wiring is correct so the situation is as follows

 

I can hear show relay through the comms at a very high level but can hear it on the loudspeaker stations very quietly can anyone explain this for me please

situation is as follows

 

comms on circit a

show relay on circit b

show relay sound source plugged into line input

line input turned up about 50%

 

ive tried swappint the beltpacks and show relay about the circits so a to b and b to a with the same results

 

im now stumped

 

any pointers in the right direction would be most apreciated

 

Thanks in advance

Carwyn

[paulears]

One of the 4 pins isn't used - one is ground one has volts on it and the other is the audio line ground one end, audio line the other, and then 20 odd volts on one of the remaining two. mine reads 1 at the ground end, 3 at the other and the middle connected one (the volts one) labelled 2.

 

So if you use it on a comms circuit, the comms audio is really loud, but show relay is very quiet? I assume the level of the show really is at the appropriate level?

[CARWYN]

Right I got ground on 1 then the power on 2 then miss one and audio on 4 as mine reads but im assuming thats correct but audio is at too low a level comming out of the stations and too high a level comming out of the comms its at the same level its always been at. im thinking is the base station chucking out wrong voltage but the system wouldnt work then I think

[DrV]

I may be barking up the wrong tree here as I don't know the 411 outstation but on the 211 there are two internal level presets - one which is also limited by the front panel control and one which overrides this control. Typically you would have show relay controlled by the front panel volume control and DSM announcements overriding that so you couldn't miss them. DSM announcements are accompanied by a 25kHz tone which does the switching in each outstation. Is it conceivable that your normal comms is being fed through in override mode and the show relay is in normal mode, thus making the show relay much quieter?

Dave

 

In answer to your original question, the info is on page 2 of this document. The print quality is appalling and the terminals aren't labelled RLLX on the diagram but that is the order of them read left to right so the audio is on R the power is on the second L and the screen is on X.

 

Dave

 

Final thought - do you get your show relay from a mic or at line level? There is a 3 position switch on the back of the 721 for Line, Mic and Mic with phantom power. If that's in the wrong position you might well get these symptoms

[CARWYN]

Hi

there are two seperate inputs one for line and one for mic so cant see that as a problem but will look at your other ideas

[paulears]

I don't think the problem is with the outstations if comms and DSM audio comes out of them at the right level. If the real fault is simply that the show relay input is quiet, then the fault will be in that area. After all, the outstations don't care where the audio came from.

 

Just a thought though. The way these usually work is that the external input from the show relay goes to both channels. You can change this internally so that relay goes to the speakers on their ring, but NOT to the comms circuit. Is it possible you have the loudspeakers on the wrong ring, and the faint feeble show relay is just leakage? Could be worth swapping A and B around to check?