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| Headphones (full-size) Discussion of full-size headphones. |
01-27-2006, 10:38 PM
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Head-Fi'er
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Join Date: Dec 2005
Location: Chicago, IL
Posts: 81
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Headphones causing interference
Ever since I got my Rega Ear I when I plug my headphones in I can hear some interference. Basically some low level humming and such that drives me crazy.
Anyways in my quest to get rid of it I noticed that when I have my headphone cable just hanging the level of interference is high. However when I put the cable on the table the interference is almost gone. Basically if the majority of the cable is at the same height level or higher of the amp, interference is almost gone.
Does this mean my cables are messed? Is this normal?
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01-29-2006, 04:22 PM
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Head-Fi'er
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Join Date: Dec 2005
Location: Chicago, IL
Posts: 81
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No one can help me?
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01-29-2006, 04:54 PM
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Headphoneus Supremus
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Join Date: Dec 2004
Location: Germany
Posts: 2,701
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Strange. Looks like some weird capacitance phenomenon or RF pickup. Try a ferrite clip on both ends of the cable, does that help in any way?
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01-29-2006, 06:01 PM
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100+ Head-Fi'er
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Join Date: May 2005
Location: SF, CA
Posts: 287
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The headphones aren't causing interference, they're receiving it. Do you have a cellphone in your pocket?
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01-29-2006, 06:45 PM
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Head-Fi'er
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Join Date: Dec 2005
Location: Chicago, IL
Posts: 81
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No I moved my cellphone to another part of the room, and theres still that wierd interference.
Where do I buy ferrite clips? I googled it and all I came up with was places that make you buy in bulk
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01-30-2006, 03:51 PM
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Head-Fi'er
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Join Date: Oct 2004
Posts: 53
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Microwave or Wireless LAN? My wireless LAN interfere my amp, I had to put two sheets of tins in between my amp and the wireless access point to block off the interference.
__________________
CANS: Shure E5 Sony MDR-CD3000 MDR-SA5000 Cardased HD650 DT-880
Amps: WooAudio3 Graham Slee Solo
Sources: M-Audio Audiophile 2496 & Audiophile 2496 Firewire, NAD CDP Silverlining 500, Sony SCD-XB 790/B
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01-30-2006, 06:45 PM
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Headphoneus Supremus
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Join Date: Nov 2002
Location: United States
Posts: 3,187
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Isn't wireless LAN in the Gigaherz range? Or you are talking about the 60Hz line interference? On second thought, the system might radiate other frequencies in the audible range, one needs to study the circuitry before have a good understanding of the problem.
To discochan: If you know what 60Hz sound like, you can compare it with the hum you were hearing.
p.s the harmonics of AC line can be significant too. such as 120Hz, etc....
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01-30-2006, 07:17 PM
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Head-Fi'er
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Join Date: Dec 2005
Location: Chicago, IL
Posts: 81
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Quote:
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Originally Posted by JahJahBinks
Isn't wireless LAN in the Gigaherz range? Or you are talking about the 60Hz line interference? On second thought, the system might radiate other frequencies in the audible range, one needs to study the circuitry before have a good understanding of the problem.
To discochan: If you know what 60Hz sound like, you can compare it with the hum you were hearing.
p.s the harmonics of AC line can be significant too. such as 120Hz, etc....
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Now that I listen to it, it does kind of sound in the 60hz range. I am using wireless lan in my room. I'm going to a hi-fi store today to pick up some stuff, Ill ask them if they have any recommendations.
Ill share anything insightful
__________________
Cambridge Audio 640C V2>>Tributaries IC>>Rega Ear>>Alessandro MS-1
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01-30-2006, 08:04 PM
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Headphoneus Supremus
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Join Date: Nov 2002
Location: United States
Posts: 3,187
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it is likely you are experiencing a ground loop problem. Does your Rega Ear have a 3-prong AC plug?
One thing you can try is to wrap the cable in some metal foil and ground the metal foil to earth ground (either from the wall outlet, or if you want a safer way, on the chassis of the amplifier, assume that is properly grounded), then see if the interferece goes away or not.
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01-30-2006, 10:00 PM
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Head-Fi'er
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Join Date: Dec 2005
Location: Chicago, IL
Posts: 81
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Man after looking at the Rega Ear its only a 2 prong plug, so does that mean I cant really ground the amp.
Thanks for all the help by the way everyone I really appreciate this
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Cambridge Audio 640C V2>>Tributaries IC>>Rega Ear>>Alessandro MS-1
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01-31-2006, 04:32 PM
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Headphoneus Supremus
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Join Date: Nov 2002
Location: United States
Posts: 3,187
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I just refresh my mind on ground loop, it seems not having a ground prong doesn't matter much, in fact you do not want the earth ground to mess with the amp chassic. What you want is to have the RCA input jacks ground connections tied to the metal chassis, check if that's done on your amp.
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01-31-2006, 04:59 PM
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100+ Head-Fi'er
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Join Date: Jan 2005
Posts: 130
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Sounds like a bad wall wart.
Isn't that a 110v to 24v AC adapter?
Try a different one.
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01-31-2006, 05:11 PM
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Head-Fi'er
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Join Date: Dec 2005
Location: Chicago, IL
Posts: 81
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Quote:
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Originally Posted by JahJahBinks
I just refresh my mind on ground loop, it seems not having a ground prong doesn't matter much, in fact you do not want the earth ground to mess with the amp chassic. What you want is to have the RCA input jacks ground connections tied to the metal chassis, check if that's done on your amp.
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When I take apart my amp, what exactly should I be looking for. To see it the RCA jacks have any physical connections to the chassis?
CRAFTECH: Ill try that thanks.
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Cambridge Audio 640C V2>>Tributaries IC>>Rega Ear>>Alessandro MS-1
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01-31-2006, 05:22 PM
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Head-Fi'er
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Join Date: Dec 2005
Location: Chicago, IL
Posts: 81
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I just took apart the amp and soldered a thin wire from the rca jacks to the chassis. This helped some but theres will some humming.
I'm going to try to find another 120v to 24v plug. It sucks because Rega is from England, hopefully it wont be hard to find another plug
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Cambridge Audio 640C V2>>Tributaries IC>>Rega Ear>>Alessandro MS-1
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01-31-2006, 09:18 PM
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100+ Head-Fi'er
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Join Date: Jan 2005
Posts: 130
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Quote:
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Originally Posted by discochan
I'm going to try to find another 120v to 24v plug. It sucks because Rega is from England, hopefully it wont be hard to find another plug
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Actually you have 230 volt 50 Hz Mains there. I almost forgot. How about one of these. Look at the adapter and match up the specs:
http://rswww.com/cgi-bin/bv/rswww/su...o?cacheID=ukie
Or ARE you in the UK? If not then Radio Shack.
Just don't get a 24 volt [ DC ] adapter.
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