damonrpayne Posted August 25, 2006 Share Posted August 25, 2006 So, I bring home my saucy new Denon dvd-1930 to enjoy some up-converted video and audio action and... I hook up the whole deal with all power off. HDMI to DVI converter, DVI into the TV. Turn everything on, an annoying hum in the speakers. Unplug the HDMI cable and it stops instantly. Put the HDMI cable NEAR the place where it plugs into the Denon, the hum starts up. Hum persists until everything is off. Two DVD players, TV, aragon stage one, aragon 2005, cable box, playstation 2 all plugged into one power strip. All forms of cords and wires mangled together and twisted around each other. I'm going to start by unpluggin and unhooking everything that's un-needed ( PS2, cable box, old DVD player). Any other thoughts? Quote Link to comment Share on other sites More sharing options...
wuzzzer Posted August 26, 2006 Share Posted August 26, 2006 I used to get some nasty hum from having all my cords tangled around each other, too. I solved the problem by separating the power chords from everything else as best as possible. Quote Link to comment Share on other sites More sharing options...
sunburnwilly Posted August 26, 2006 Share Posted August 26, 2006 Umm Sounds like you have either your cable or sat hooked up in your system . If so you could definitely use a ground loop isolator . Quote Link to comment Share on other sites More sharing options...
damonrpayne Posted August 26, 2006 Author Share Posted August 26, 2006 Experimentation late last night showed that disconnecting the coax from the cable box caused the hum to stop immediately. I'll look into an isolator for that. Quote Link to comment Share on other sites More sharing options...
BobbyT Posted August 26, 2006 Share Posted August 26, 2006 www.partsexpress.com has them for low $ Quote Link to comment Share on other sites More sharing options...
damonrpayne Posted August 27, 2006 Author Share Posted August 27, 2006 Got a part #? Quote Link to comment Share on other sites More sharing options...
Me Loves Khorns Posted August 27, 2006 Share Posted August 27, 2006 Sunburnwilly, Can you explain a ground loop isolator? Paul Quote Link to comment Share on other sites More sharing options...
SCOOTERDOG Posted August 27, 2006 Share Posted August 27, 2006 Danon, It's the Jensen ground loop isolator you need. Keep in mind this is only for cable not sat. scooter Quote Link to comment Share on other sites More sharing options...
sunburnwilly Posted August 27, 2006 Share Posted August 27, 2006 Sunburnwilly, Can you explain a ground loop isolator? Paul Sorry MLK I'm not an engineer and can't explain it . [:$] I just know that without it my system would be unlistenable . 10 years ago I purchased a Parasound processor and a 3 channel Acurus amp . When I hooked everything up I had an unbearable hum . I called the dealer I bought the equipment from and he said the Mondial Ground Loop Isolation Circuit would solve the problem . It was $75.00 back then but he gave it to me since I had made a substantial purchase from him . The darned thing works !!! You can sometimes find them at Klipsch's EBay store , for substantialy less than what they cost years ago . Scooter brings up a good point , they are for cable not sat . "I never had a problem with sat when I had it , the audio on sat is heads and shoulders above cable !" And once again , here it is ... Quote Link to comment Share on other sites More sharing options...
SCOOTERDOG Posted August 28, 2006 Share Posted August 28, 2006 For sat systems this is the puppy you need. I bought one of these and it worked like a charm. About 60 bucks but well worth it. scooter http://www.ebtechaudio.com/humxdes.html Quote Link to comment Share on other sites More sharing options...
damonrpayne Posted August 28, 2006 Author Share Posted August 28, 2006 I have cable. Guys, will this guy work, I'll go buy it. http://cgi.ebay.com/MAGIC-Splitter-Mondial-Antenna-Ground-Isolation-Circuit_W0QQitemZ9705122904QQihZ008QQcategoryZ14968QQcmdZViewItem Quote Link to comment Share on other sites More sharing options...
sunburnwilly Posted August 28, 2006 Share Posted August 28, 2006 I have cable. Guys, will this guy work, I'll go buy it. http://cgi.ebay.com/MAGIC-Splitter-Mondial-Antenna-Ground-Isolation-Circuit_W0QQitemZ9705122904QQihZ008QQcategoryZ14968QQcmdZViewItem Yes ! That is the deluxe version of the one I have . Quote Link to comment Share on other sites More sharing options...
Me Loves Khorns Posted August 28, 2006 Share Posted August 28, 2006 I too am getting some noise. Seems to mainly be coming from my back speakers when it is in surround mode. When the preamp is set to stereo, it goes away. Does not seem to have the hum in the front or center. Do you think this thing would help, and if so, do you just place this in line as the cable comes from the wall to the system? I have a surge protector in line also. Would this go on the wall side or the cable box side of the surge protector? Paul Quote Link to comment Share on other sites More sharing options...
TheSoundBroker Posted August 31, 2006 Share Posted August 31, 2006 One thing you might want to be aware of guys... The latest digital and high def cable systems depend on a return signal from the cable box and a lot of bandwidth. Not all ground loop lifters are created equally. If you watch any PPV thru the box, or have a high def box, some may create problems. If that happens, your only choice is to put an isolation transformer into the system between the amp and video. Quote Link to comment Share on other sites More sharing options...
DrWho Posted August 31, 2006 Share Posted August 31, 2006 Yikes, is there a cheaper alternative for those of us not running the crazy high-end video from the cable box? What about something like this and choosing a common ground to the audio equpment? http://www.partsexpress.com/pe/showdetl.cfm?Partnumber=090-338 Quote Link to comment Share on other sites More sharing options...
Me Loves Khorns Posted September 1, 2006 Share Posted September 1, 2006 What is an isolation transformer? How is it used? What is that ground that Dr Who is showing?, How would it work? Paul Quote Link to comment Share on other sites More sharing options...
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