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Audio Public Address Sound System.

Zoomup
Mornin' All,

                    I need some advice please.


Imagine a portable sound system as used by travelling musicians, rock guitarists or others with electric instruments. There will be a large mixing desk, and amplifier and speakers. All is well if the musicians with electric instruments only plug their 1/4 inch jack plugs into their instruments when the mixer sliders are down (off) so as not to cause a big pop or bang through the speakers. Sometimes though the jack plugs are unplugged from the instruments when the mixer sliders are up (on) and a terrible sound results from the speakers.


Is there a "magic box" that can be inserted in line with the audio leads from the instruments to the mixer that AUTOMATICALLY prevents this unwanted loud noise problem?


Thanks,


Z.
  • 0
    They only stop some of the "funny noises" that Z was worried about, but you could try one. Here is some gen, but lots of people have had various problems because they have poor strain relief and solderless (IDC) connections. Try www.youtube.com/watch?v=BbgSUpR1plg and "neutrik silent jack plug" in google for comments. I sent Z my phone number for chat via PM, but you no longer seem to get told there is a message waiting, another website bug Lisa???


    kind regards David

  • 0
    Why not make a 2 into 1 jack socket with a jack output, a double pole change over switch, with supressing capacitors


    Legh
  • 0

    Legh Richardson:

    Why not make a 2 into 1 jack socket with a jack output, a double pole change over switch, with supressing capacitors


    Legh




    I did try to parallel the output from the violin's transducer/pre-amp.  with one connection to my combo amplifier and the other to the main mixing desk, but the signal must have been too weak for the mixing desk as nothing came out of the main speakers. After just plugging into the main mixing desk only all was good. I though that all audio inputs were very high impedance and only a very small audio signal is required.


    Z.

  • 0

    davezawadi:

    They only stop some of the "funny noises" that Z was worried about, but you could try one. Here is some gen, but lots of people have had various problems because they have poor strain relief and solderless (IDC) connections. Try www.youtube.com/watch?v=BbgSUpR1plg and "neutrik silent jack plug" in google for comments. I sent Z my phone number for chat via PM, but you no longer seem to get told there is a message waiting, another website bug Lisa???


    kind regards David

     




    Thanks for thinking of me Dave, I will try to phone you at some time when I am not exhausted, if I can find your number. I had a hard work day today and my brain is very slow.


    Z.

     

  • 0

    Zoomup:




    Legh Richardson:

    Why not make a 2 into 1 jack socket with a jack output, a double pole change over switch, with supressing capacitors


    Legh




    I did try to parallel the output from the violin's transducer/pre-amp.  with one connection to my combo amplifier and the other to the main mixing desk, but the signal must have been too weak for the mixing desk as nothing came out of the main speakers. After just plugging into the main mixing desk only all was good. I though that all audio inputs were very high impedance and only a very small audio signal is required.


    Z.


     




    The mixer requires a particular impedance on each channel to work optimally.  If you just try to split the signal, you will experience a reduction in volume.  There are special adapters available to split an instrument signal to two mixers/signal inputs.  You need to be careful when using phantom power on both mixers as damage could occur.


    If your combo amplifier is used for monitoring purposes, you can use the feedthrough socket on a DI box.  The main balanced output would go to the mixing desk.

  • 0
    I was only offered a non balanced lead to go to the main mixer with a 1/4 inch jack plug on it. Do D.I. boxes use XLR sockets?


    Z.


  • 0
    Yes, a DI box will take a 1/4" unbalanced input from your instrument and convert it to balanced XLR to run back to your mixer.  Most have a loop through (link) on the input so you can feed a monitoring amplifier/speaker.


    This is a good one:

    https://www.thomann.de/gb/bss_ar133.htm


    There are cheaper ones, try to avoid Behringer.
  • 0

    M. Joshi:

    Yes, a DI box will take a 1/4" unbalanced input from your instrument and convert it to balanced XLR to run back to your mixer.  Most have a loop through (link) on the input so you can feed a monitoring amplifier/speaker.


    This is a good one:

    https://www.thomann.de/gb/bss_ar133.htm


    There are cheaper ones, try to avoid Behringer.




    Thanks very much M.J.


    Z.

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