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| Hum Eliminator https://mail.karaokescenemagazine.net/forums/viewtopic.php?f=1&t=8947 |
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| Author: | McPostal [ Fri Dec 22, 2006 3:56 pm ] |
| Post subject: | Hum Eliminator |
Does anyone have any opinions on this: ART Dual Transformer/Isolator Hum Eliminator http://www.musiciansfriend.com/product/ART-Dual-TransformerIsolator-Hum-Eliminator?sku=180637 I'm using powered peavy speakers with XLR ins but I don't have XLR outputs from my mixer. I'm thinking I can use short 1/4 jack cables from the mixer to the Hum Eliminator and mic cables from the Hum Eliminator to the powered PA speakers. Any thoughts? I am sick of the hums. |
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| Author: | karyoker [ Fri Dec 22, 2006 4:07 pm ] |
| Post subject: | Re: Hum Eliminator |
We used isolation transformers on various things like "transformerless power supplies in portable tvs" for years For example if you hooked up a scope to a signal point and grounded the probe you are running a hot point to earth ground which is a no-no.. The only requirement of a 1:1 isolation transformer is power capabilities... But they work and work good... If you use a single conductor going to powered speakers you get hum unless you break the earth ground on the power plug.. So if you use balanced you wont have this prob.. If you have single ended outs on your mixer use 2 conductor and run hot thru 2 and return and signal ground with pin 3 .... Using standard trs 2 conductor run pin 2 on both left and right channels to the same colored wire . Short pin 3 to pin 1 which is ground.... (on the mixer end) |
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| Author: | Guest [ Sat Dec 23, 2006 2:47 pm ] |
| Post subject: | Re: Hum Eliminator |
When do you hear the hum? Is everything quiet until you hook up to the TV? |
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| Author: | McPostal [ Sat Dec 23, 2006 6:24 pm ] |
| Post subject: | Re: Hum Eliminator |
Karyoker huh? Bigdog It only hums when I use long cables. Originally I was looking for a box to transform the 1/4 plug to an xlr jack. That's when I ran across the Hum Eliminator which does what I was looking for AND eliminates hum. |
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| Author: | karyoker [ Sat Dec 23, 2006 7:09 pm ] |
| Post subject: | Re: Hum Eliminator |
Quote: Karyoker huh?
Give me some details ... Mixer? Are you using trs cables? I have hooked up JBL Mackie powered speakers up to 200 feet.. If you are not using balanced or trs cables you will get hum... Ihave been down this road many times... Are you running balanced audio to your speakers? Balanced audio uses 3 conductor cable 2 wires and a shield . Go to a store thatv kows what the hell they are doing and buy a trs cable... |
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| Author: | McPostal [ Sun Dec 24, 2006 7:22 am ] |
| Post subject: | Re: Hum Eliminator |
My speakers are Peavy PR15P. My mixer is a Roland VM3100 Pro. I just did some research and found out that it doesn't have balanced analog outputs. This is the best picture of it I could find:http://cgi.ebay.com/Roland-VM-3100-PRO-VM3100-Digital-Mixer-RBus-R-Bus-VM_W0QQitemZ130060881845QQihZ003QQcategoryZ41479QQcmdZViewItem |
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| Author: | karyoker [ Sun Dec 24, 2006 7:51 am ] |
| Post subject: | Re: Hum Eliminator |
Try an adapter on your speaker power cord which breaks the ground If the hum goes away then you need an xlr cable hooked up thusly.. |
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