fluorescent filter
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From: gwatts on 10 Dec 2009 09:24 Michael Dobony wrote: > On Thu, 10 Dec 2009 01:36:18 -0500, Tim Perry wrote: > >> "Michael Dobony" <survey(a)stopassaultnow.net> wrote in message >> news:1hg9s8h0shgfc$.15vqv2bmnzvy$.dlg(a)40tude.net... >>> On Wed, 09 Dec 2009 19:59:01 -0500, Bob(a)kandystan.com wrote: >>> >>>> On Tue, 8 Dec 2009 22:50:17 -0600, Michael Dobony >>>> <survey(a)stopassaultnow.net> >>>> wrote: >>>> >>>>> What is the best way to filter fluorescent induced hum out of a sound >>>>> system? I tried setting the FD manually to filter the offending >>>>> frequency, >>>>> but that is not working. >>>>> >>>>> Mike D. >>>> First, you need to find what equipment it is actually affecting... >>>> >>>> Unplug stuff starting from the inputs until the noise goes away... You >>>> could >>>> also try turning off lights as well... >>>> >>> Plugging a mic cable into the stage jack makes it hum. With a mic on the >>> cable it gets worse. Silent without the mic cable plugged in. >>> >> Miswired cable? > > 6 different cables are doing the same thing, including 3 premium new > cables, Live wire Elite, Planet Waves (case shorted to ground), and Mogami > Gold. Does the hum go away when the fluorescent lights are turned off? That hasn't been stated. If so, maybe their ballasts are polluting the AC line.
From: Ron on 10 Dec 2009 10:18 Michael Dobony wrote: > On Thu, 10 Dec 2009 01:36:18 -0500, Tim Perry wrote: > >> "Michael Dobony" <survey(a)stopassaultnow.net> wrote in message >> news:1hg9s8h0shgfc$.15vqv2bmnzvy$.dlg(a)40tude.net... >>> On Wed, 09 Dec 2009 19:59:01 -0500, Bob(a)kandystan.com wrote: >>> >>>> On Tue, 8 Dec 2009 22:50:17 -0600, Michael Dobony >>>> <survey(a)stopassaultnow.net> >>>> wrote: >>>> >>>>> What is the best way to filter fluorescent induced hum out of a sound >>>>> system? I tried setting the FD manually to filter the offending >>>>> frequency, >>>>> but that is not working. >>>>> >>>>> Mike D. >>>> First, you need to find what equipment it is actually affecting... >>>> >>>> Unplug stuff starting from the inputs until the noise goes away... You >>>> could >>>> also try turning off lights as well... >>>> >>> Plugging a mic cable into the stage jack makes it hum. With a mic on the >>> cable it gets worse. Silent without the mic cable plugged in. >>> >> Miswired cable? > > 6 different cables are doing the same thing, including 3 premium new > cables, Live wire Elite, Planet Waves (case shorted to ground), and Mogami > Gold. Then it`s the connector that`s either miswired or not balanced. You say stage _jack_, it IS all balanced isnt it? Maybe if you told us what the rest of the equipment is, someone would stand a chance of diagnosing the problem. Ron(UK)
From: Michael Dobony on 10 Dec 2009 10:20 On Thu, 10 Dec 2009 09:24:49 -0500, gwatts wrote: > Michael Dobony wrote: >> On Thu, 10 Dec 2009 01:36:18 -0500, Tim Perry wrote: >> >>> "Michael Dobony" <survey(a)stopassaultnow.net> wrote in message >>> news:1hg9s8h0shgfc$.15vqv2bmnzvy$.dlg(a)40tude.net... >>>> On Wed, 09 Dec 2009 19:59:01 -0500, Bob(a)kandystan.com wrote: >>>> >>>>> On Tue, 8 Dec 2009 22:50:17 -0600, Michael Dobony >>>>> <survey(a)stopassaultnow.net> >>>>> wrote: >>>>> >>>>>> What is the best way to filter fluorescent induced hum out of a sound >>>>>> system? I tried setting the FD manually to filter the offending >>>>>> frequency, >>>>>> but that is not working. >>>>>> >>>>>> Mike D. >>>>> First, you need to find what equipment it is actually affecting... >>>>> >>>>> Unplug stuff starting from the inputs until the noise goes away... You >>>>> could >>>>> also try turning off lights as well... >>>>> >>>> Plugging a mic cable into the stage jack makes it hum. With a mic on the >>>> cable it gets worse. Silent without the mic cable plugged in. >>>> >>> Miswired cable? >> >> 6 different cables are doing the same thing, including 3 premium new >> cables, Live wire Elite, Planet Waves (case shorted to ground), and Mogami >> Gold. > > > Does the hum go away when the fluorescent lights are turned off? That > hasn't been stated. If so, maybe their ballasts are polluting the AC line. Hum goes away when I turn the stage fluorescent light off. The rest of the multitude of lights do not affect it.
From: Michael Dobony on 10 Dec 2009 10:41 On Thu, 10 Dec 2009 15:18:04 +0000, Ron wrote: > Michael Dobony wrote: >> On Thu, 10 Dec 2009 01:36:18 -0500, Tim Perry wrote: >> >>> "Michael Dobony" <survey(a)stopassaultnow.net> wrote in message >>> news:1hg9s8h0shgfc$.15vqv2bmnzvy$.dlg(a)40tude.net... >>>> On Wed, 09 Dec 2009 19:59:01 -0500, Bob(a)kandystan.com wrote: >>>> >>>>> On Tue, 8 Dec 2009 22:50:17 -0600, Michael Dobony >>>>> <survey(a)stopassaultnow.net> >>>>> wrote: >>>>> >>>>>> What is the best way to filter fluorescent induced hum out of a sound >>>>>> system? I tried setting the FD manually to filter the offending >>>>>> frequency, >>>>>> but that is not working. >>>>>> >>>>>> Mike D. >>>>> First, you need to find what equipment it is actually affecting... >>>>> >>>>> Unplug stuff starting from the inputs until the noise goes away... You >>>>> could >>>>> also try turning off lights as well... >>>>> >>>> Plugging a mic cable into the stage jack makes it hum. With a mic on the >>>> cable it gets worse. Silent without the mic cable plugged in. >>>> >>> Miswired cable? >> >> 6 different cables are doing the same thing, including 3 premium new >> cables, Live wire Elite, Planet Waves (case shorted to ground), and Mogami >> Gold. > > Then it`s the connector that`s either miswired or not balanced. You say > stage _jack_, it IS all balanced isnt it? > Yes it is balanced. I checked the wiring, but am going to check it again after I get back > Maybe if you told us what the rest of the equipment is, someone would > stand a chance of diagnosing the problem. > > Ron(UK) Mackie 1202vlz, Audio Logic 660 compressor on the public mic channel, Behringer DEQ2496, Crown XLX202 amp, 24+4 snake of unknown brand, two 12" Yamaha speakers (will have to check model # when I take it down to paint the mounts). With all this hooked up on a single outlet the system is silent. Snake is at least 6 feet away from the lights and 10 feet above the stage. Hook up a mic cable to any of the floor jacks it picks up the fluorescent lights. Plug in a mic to the cable and it is worse. The lights will be needed for about 95% of the time this system is used. Also, when first hooked up the hum was worse until I realized the temporary extension cord had no ground and was swapped out. Permanent electrical is coming next week, but we need this for this weekend. After changing out the extension cord the hum was tolerable by cutting the mids. This also adversely affected the sound quality, but was usable. The mics are AT DB125. Working on replacing them with something acceptable, hand-me-downs from the sanctuary, replaced by Sennheiser 835's.
From: Phildo on 10 Dec 2009 10:53
"Michael Dobony" <survey(a)stopassaultnow.net> wrote in message news:16x5tehmispmw$.1p6uagn691fpj$.dlg(a)40tude.net... >> Miswired cable? > > 6 different cables are doing the same thing, including 3 premium new > cables, Live wire Elite, Planet Waves (case shorted to ground), and Mogami > Gold. The miswired cable could be one of the others in your system and plugging a cable/mic in is what shows the problem is there but is not actually the cause. Does the noise go away if the lights are turned off? If not then you have a grounding problem. Phildo |