Tobi A Posted December 19, 2020 Report Share Posted December 19, 2020 My set up is Lectrosonics SRC (also tried 411a) feeding 833, both powered from remote audio BDS and Audioroot battery. I'm getting a high pitched hum/whine when I use the Aux channel 7/8 input on my 833. Problem stops if I power SRC from its own battery using the Battsled so Im guessing its a ground loop. Anyone else experienced this? Can I disconnect the ground between the SRC and 833 input? Should I get a line isolator like this - https://www.radialeng.com/product/icecube? Quote Link to comment Share on other sites More sharing options...
DanieldH Posted December 19, 2020 Report Share Posted December 19, 2020 Had a similar effect with a 788t and a few ek100+dc2, connected to a Hawkwoods V mount plate. My workaround was to connect the 788t directly to the batteries own AntonBauer. Quote Link to comment Share on other sites More sharing options...
r.paterson Posted December 19, 2020 Report Share Posted December 19, 2020 6 hours ago, Tobi A said: My set up is Lectrosonics SRC (also tried 411a) feeding 833, both powered from remote audio BDS and Audioroot battery. I'm getting a high pitched hum/whine when I use the Aux channel 7/8 input on my 833. Problem stops if I power SRC from its own battery using the Battsled so Im guessing its a ground loop. Anyone else experienced this? Can I disconnect the ground between the SRC and 833 input? Should I get a line isolator like this - https://www.radialeng.com/product/icecube? Yes that would work..in set up you currently have src needs to be unbal out pin 1 and 2 only on ta3 and you lose 6db gain going unbal from SRC..by going thru a transformer isolator you keep full gain as its balaced in from src and unbal out via trandformer so no gain drop..it is more bulk to put in your bag tho 2 x Ice Cube..and if using other transformers isolating make sure they can handle the full line level out from the SRC, the Radial Ice Cube says it can handle pro line level so you would be good to go with 2 x Radial Ice cube iso.. Quote Link to comment Share on other sites More sharing options...
Tobi A Posted December 21, 2020 Author Report Share Posted December 21, 2020 Thanks for the replies, I think I'll just run seperate batteries for now. Quote Link to comment Share on other sites More sharing options...
Dave Pullmer Posted December 22, 2020 Report Share Posted December 22, 2020 That is unfortunate - I wouldn’t want to pick up a 833 if it meant I had to power my ch7/8 wireless separately, adding more weight to the bag. any other SRC users experience this? Quote Link to comment Share on other sites More sharing options...
ProSound Posted December 22, 2020 Report Share Posted December 22, 2020 This is an issue with power system and unbalanced inputs won't blame the 833 too much. I would suggest trying another power system to see if problem persists. Quote Link to comment Share on other sites More sharing options...
PMC Posted December 22, 2020 Report Share Posted December 22, 2020 I am still using an SD664 as my bag mixer. Three SRb receivers powered from BDS v2 feeding mixer at line level. No problems. When I am working reality shows and need more wireless I use my retired Senn G3 units. As soon as I try to power them off of the same BDS distro with the Senn battery eliminators I hear a low volume whine on the mixer inputs fed from the G3s. The G3s are unbalanced. If i power the G3s from a second battery or just a couple of AAs the signal is clean. It has been this way for the past 8 or 10 years. All SD can say is it must be because of the unbalanced nature of the G3s. I even wrapped the DC feed cables with clamp on chokes. No improvement. Then I tried XLR isolation transformers and experienced some improvement. I reckon mixing balanced and unbalanced signals is like dogs and cats sleeping together. You are going to hear a whine and someone is going to get hurt Quote Link to comment Share on other sites More sharing options...
chris_bollard Posted February 2, 2021 Report Share Posted February 2, 2021 Hey Tobi. I power mine from the SL 2 hirose DC output without any issue. The TA3 is wired with the out of phase pin not connected: may or may not be part of the problem. Quote Link to comment Share on other sites More sharing options...
stefanosound Posted February 2, 2021 Report Share Posted February 2, 2021 On 12/19/2020 at 7:17 AM, Tobi A said: My set up is Lectrosonics SRC (also tried 411a) feeding 833, both powered from remote audio BDS and Audioroot battery. I'm getting a high pitched hum/whine when I use the Aux channel 7/8 input on my 833. Problem stops if I power SRC from its own battery using the Battsled so Im guessing its a ground loop. Anyone else experienced this? Can I disconnect the ground between the SRC and 833 input? Should I get a line isolator like this - https://www.radialeng.com/product/icecube? try to cut the ground on 7/8 input ... It seems like a ground loop... Quote Link to comment Share on other sites More sharing options...
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