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mackerr

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    Working in the industry
  • Current Employment or place of study
    Self employed freelance sound system designer and FOH mixer. 45+ years experience in special events, TV, and theater. everything from community theater to Broadway, but never the West End. :-)
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    IATSE Local 52 Studio Mechanics, and IATSE Local 353 Theater
  • Full Name
    Mac Kerr

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    mackerr
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    Near New York City, USA

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mackerr's Achievements

  1. If it's passing full range audio, but not phantom power the problem is most likely a broken wire on pin 1. Just open the connector and re-solder the shield to pin 1. Phantom power is applied to pins 2&3 equally. but it is in relation to ground on pin 1. Without pin 1, no phantom, without pins 2 or 3 usually audio would be low and thin, or non-existent. Mac
  2. mackerr

    Zero Ohms

    I expect it is just a big transformer in the box. The brochure never says no transformer, it say you don’t need 70/100V transformers. It also says “transforming audio”. In 70/100V systems each speaker has a transformer, I think with this there is one large transformer for all the speakers. Mac
  3. If you go with a system like the [url=https://www.prg.com/en/technology/innovation/groundcontrol-followspot-system]PRG Ground Control[/url] or the Robe [url=https://www.robe.cz/robospot]RoboSpot[/url] there would be almost no learning curve and the spot ops could be anywhere a DMX line can reach. the other Mac
  4. mackerr

    DMX problem

    Best response so far... Mac
  5. mackerr

    Nexo PS15 setup

    Generally in the case of a full range speaker sitting on top of a sub the delay would be on the top speaker. Subs are naturally delayed by the low pass filter. Mac
  6. In a single venue you are probably right, however, there may be people involved in the production who need the mobility to leave the venue. If the production involves multiple venues, or multiple cities or even multiple countries, it is much harder to run those wires. Solutions like Unity or Clear Com's Agent IC, properly implemented are a no brainer in these cases.
  7. Here is a link to a training/demo of Unity by Pete Erskine. https://www.facebook.com/events/303801038342512/?ref=newsfeed
  8. There are a couple of production comms apps that know of. I think the most widely used is [url=https://www.unityintercom.com/pricing]Unity Comms[/url]. There are 6 channels available on each phone, very low latency, and good audio. The user app is free and available for IOS or Android, the server software costs real money, but server time can be rented from a few people. Unity was the main production comm for the live police show in the US. All camera comms, IFB and program feeds were done on cellphones. I have tested them on transcontinental connections and they work remarkably well. Clear Com does also have a system called Agent-IC but there are significant hardware expenses involved. Mac
  9. From the Times Microwave calculator https://www.timesmicrowave.com/Calculator?Product=RG-213&RunLength=100&Frequency=2000 RG58 has a loss of 22dB/100feet at 2GHz, RG213 is 10dB, and LMR400 is 6.6dB/100feet. The LMR195 from the Line spec is 16.9dB of loss/100 feet. Using long antenna cables at 2.4GHz is not a good idea. LMR400 is good, but thick and expensive. RG58 is barely acceptable at 600MHz for runs over 25 feet. Coaxial cable has a frequency response curve, and it does not favor 2.4GHz systems. Mac
  10. mackerr

    Earth Loop - HDMI

    The Peavey and the usb BalBox2 are both transformer isolated. Mac
  11. mackerr

    Earth Loop - HDMI

    Hmmm… That didn’t last long. When I posted the link they were available and listed as £69. The alternative posted looks good, using a usb audio output device not only provides transformer isolation, but generally provides significantly better audio quality. Mac
  12. mackerr

    Earth Loop - HDMI

    And if you are in the UK... https://www.interspaceind.com/shop-our-products/product/50-usb-balbox-2/category_pathway-44.html The link I provided was for Amazon UK, do they not ship to the UK? Mac
  13. mackerr

    Earth Loop - HDMI

    Using DI boxes for the audio as suggested above is the better solution. Running out long power cables sometimes doesn't work and is often a pain to do. Or better yet, avoid the generally noisy headphone amp with a transformer isolated USB audio interface. https://www.amazon.co.uk/Peavey-3001370-USB-P-USB-Playback/dp/B004A4PSEU Mac
  14. Yes. Blew up outputs 1 & 2 of my Roland Octacapture that way. Good thing it still has 6 jack outs... Mac
  15. It's likely that it's a SMPTE type camera cable that has 2 fibers plus power in the tactical jacket. They are pretty rugged, and are plug and play with most modern b'cast cameras. Mac
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