matthiasp Posted January 19, 2021 Report Share Posted January 19, 2021 I planned on using an Ambient UMP-2 with a Lectro SMWB for boom. The setup basically works, but there is a whistling noise when using the SMWB. I guess it is neither the cable nor the power supply as I tested both with an older SMa, and there is no hiss. The noise is present on all 3 of my SMWBs. Did someone here encounter this or knows a workaround? Quote Link to comment Share on other sites More sharing options...
karlw Posted January 20, 2021 Report Share Posted January 20, 2021 Hi Matthias, the workaround is to disable the remote control function (rc=off). Quote Link to comment Share on other sites More sharing options...
matthiasp Posted January 23, 2021 Author Report Share Posted January 23, 2021 Thank you very much, that did indeed solve the problem. Quote Link to comment Share on other sites More sharing options...
IYS Posted February 28, 2021 Report Share Posted February 28, 2021 Hi, I have the same situation with SMWB, I ve bought 3 units on September 2021 with SRC receivers and the hiss is still much recogizable even after turned off rc... (which I actually need to use), its starts at 2750 Hz... (screenshot attached) any ideas very appreciate, Thx! Quote Link to comment Share on other sites More sharing options...
karlw Posted March 1, 2021 Report Share Posted March 1, 2021 IYS - I'm not sure this is the same issue as reported by the OP. What mics are you using with these transmitters? How are they wired? Have you tried other microphones, or line level sources? How is your input gain set? What compat mode are you using? Karl Winkler Lectrosonics, Inc. Quote Link to comment Share on other sites More sharing options...
IYS Posted March 2, 2021 Report Share Posted March 2, 2021 Hi Karl, Thanks for answering! I used them with DPA4061 and 4060, comp EU Hybrid, and NU, but actually tested with others to with the same results.. gain around 25/27 sometimes lower, but I didn’t see changes at hiss level much, didn’t try line level, but I pluged DPAs direct to the recorder and the sound was clear.. Quote Link to comment Share on other sites More sharing options...
gianlucaD Posted June 7, 2021 Report Share Posted June 7, 2021 Hi, I hope this can help who, like me, have "noise" problem with SMWB. https://www.lectrosonics.com/the-wire-lists/889-wire-lists-33-hey-whats-that-sound.html I solved my problem avoiding frequencies evenly divisible by 12 Quote Link to comment Share on other sites More sharing options...
LarryF Posted June 7, 2021 Report Share Posted June 7, 2021 1 hour ago, gianlucaD said: Hi, I hope this can help who, like me, have "noise" problem with SMWB. https://www.lectrosonics.com/the-wire-lists/889-wire-lists-33-hey-whats-that-sound.html I solved my problem avoiding frequencies evenly divisible by 12 Lectro has a hardware fix for the problem. 1 800 821-1121 Quote Link to comment Share on other sites More sharing options...
gianlucaD Posted June 7, 2021 Report Share Posted June 7, 2021 Thanks Larry! Do you know if the hardware fix is free of charge? (mine is out of warranty,too) Quote Link to comment Share on other sites More sharing options...
LarryF Posted June 7, 2021 Report Share Posted June 7, 2021 Typically Lectro has fixed designed in problems at no charge. I can't imagine this isn't covered. Check with service. Best Regards, Larry Fisher Quote Link to comment Share on other sites More sharing options...
karlw Posted February 1, 2022 Report Share Posted February 1, 2022 Off and on for some years now we have had reports of a “whine” at 2.75 kHz in the audio of the SMWB family transmitters. For the customers experiencing this issue, the short term “bandage” has been to turn off the remote capability of the unit. Units that were sent in to our service department received replacement circuit boards. In other words, this has not been an ideal situation. I have good news! Our intrepid programmers have found a way to solve this problem purely in firmware. Thus, we have now published updates for ALL versions of the SMWB family transmitters, including models specific to International markets, and even for those models with older hardware made prior to mid-2019. All of the specifics of all the different versions, with full revision history for each are here: https://lectrosonics.com/firmware/category/174-smwb-series-firmware.html Please note that it is extremely important that you follow the information on that page carefully. Because we have made these transmitters for more than 4 years, there are different hardware versions out there. Installing the wrong firmware can “brick” these units, requiring further handholding that I’m certain we all want to avoid. The instructions for the process of updating the firmware in these units is in the manual on p. 18. https://lectrosonics.com/downloads/category/61-transmitters.html?download=736:smwb-manual-all-models We are here to help! If you have ANY QUESTIONS or have any doubt about this process or which version to install on a given unit, please contact us at 800-821-1121 (US) or +1 (505) 892-4501 email is service.repair@lectrosonics.com Quote Link to comment Share on other sites More sharing options...
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