dbuckley Posted August 28, 2007 Share Posted August 28, 2007 Has anyone run a multicore right down the middle of a loop? If so, did you suffer any inductive effects? Link to comment Share on other sites More sharing options...
paulears Posted August 28, 2007 Share Posted August 28, 2007 well our usual multicore run goes straight over, but not through our loop. If you imagine a squared loop, the the multi run enters about 5 o'clock, and exits normally about 1 o'clock. From time to time people use a closer mix position that enters the same place but ends within the loop. never had any trouble at all. The loop is in a slot in the floor, the mult0 crosses about 10mm above it. Link to comment Share on other sites More sharing options...
gyro_gearloose Posted August 29, 2007 Share Posted August 29, 2007 Our multicore run sits alongside our induction loop for most of its length and we never have problems with audio. It does seem to slightly affect composite video though. Link to comment Share on other sites More sharing options...
Lamplighter Posted August 29, 2007 Share Posted August 29, 2007 For several years I worked in a venue where the multi plus several additional mic lines ran parallel to one leg of the loop for 18m about 50mm above the loop. I never experienced any crosstalk problems.Brian Link to comment Share on other sites More sharing options...
eviljohn2 Posted August 29, 2007 Share Posted August 29, 2007 As has been mentioned above, I've not had problems with audio lines but video runs are very susceptible to interference from an induction loop. :( Link to comment Share on other sites More sharing options...
dbuckley Posted August 30, 2007 Author Share Posted August 30, 2007 Thanks guys. I've never had (unfixable) problems with a loop either, but I've never run the multi right down the middle, only down the side. I'd no reason to suspect that the middle would be worse than the sides, but thought I'd ask anyway. I fully concur with unbalanced signals like composite video get the worked over feeling from the loop. Especially "when in reality there's just 100mA / m of rabid mains hum in the room topped up with a small amount of unintelligible speech ;-)" Yep, it was worth the question just to quote that bit from this thread Link to comment Share on other sites More sharing options...
J Pearce Posted August 31, 2007 Share Posted August 31, 2007 A church whose PA I look after has their multi running straight through the loop, crossing it twice. Doesn't cause any problems on balanced signals. I haven't ever tried unbalanced audio, but the coax composite video line does ok. Link to comment Share on other sites More sharing options...
Simon Lewis Posted September 1, 2007 Share Posted September 1, 2007 I've never had (unfixable) problems with a loop either, but I've never run the multi right down the middle, only down the side. I'd no reason to suspect that the middle would be worse than the sides, but thought I'd ask anyway. The signal increases towards the edge of the loop - since that is where the highest field strength is. Link to comment Share on other sites More sharing options...
dbuckley Posted September 7, 2007 Author Share Posted September 7, 2007 Widening the topic a little; has anyone had their FOH position inside the loop, and how did that work out...? Link to comment Share on other sites More sharing options...
MarkPAman Posted September 7, 2007 Share Posted September 7, 2007 I had an old Soundcraft (800B ?) inside a loop. Terrible. All sorts of strange feedback. Unballenced insert leads then made things worse. Turning the loop amp off fixed it. Link to comment Share on other sites More sharing options...
paulears Posted September 7, 2007 Share Posted September 7, 2007 We have two, one in, one out. Never a peep. In fact, I hadn't even thought about it till this topic came along! Link to comment Share on other sites More sharing options...
dbuckley Posted September 7, 2007 Author Share Posted September 7, 2007 Mark hit my concern on the head; most of the cabling at FOH is unbalanced, inserts, line ins, CD, etc etc etc, and the wiring inside any desk that I'm ever likely to afford to buy or rent is also unbalanced, albeit in a generally metal box. When my standard venue gets redone, we'll doubltess have a loop (which is good), but the back across section of the loop is probably going to be within an angstrom unit or two of the desk and outboard... Link to comment Share on other sites More sharing options...
Lamplighter Posted September 8, 2007 Share Posted September 8, 2007 In the installation I originally mentioned, the loop ran within 300mm of the sound operators head. All of the equipmment was inside the loop. The mic and line outs were all balanced but plenty of local unbalanced feeds. No problems were encountered. Brian Link to comment Share on other sites More sharing options...
chappy Posted September 9, 2007 Share Posted September 9, 2007 sorry to kinda hi-jack this topic... but, in our new building, the main hall (also where most of the productions will be held) there is an induction loop fitted... my problem is... I havent had any experience with one.... theres a box in the back room... although I havent really had a chance to look at it... should there be a line from the mixer to the box? where does it go from the box? Link to comment Share on other sites More sharing options...
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