Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Need help eliminating hum
Need help eliminating hum
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 6th June 2005, 03:35 PM   #1
madpoet is offline madpoet  United States
diyAudio Member
Join Date: May 2005
Location: Connecticut
Default Need help eliminating hum

Ok, I've got two sources of hum in my system and I'm not sure how to eliminate them. I'm running a Denon 3805 using the component switcher and two amps that power L/R/C/Sub. I have an HD Tivo running in to it, and the component output goes to my TV. The TV has cable running directly into it. So... component in from the HD Tivo, out to the TV. When the HD Tivo is on the line without the TV, I get hum. And vice versa. I disconnected the cable line from the TV and the hum is better, but not completely gone. So I've got hum coming from two sources, one of which gets marginally better when I disconnect my cable line. I will get an isolator for the cable, but that won't completely fix the problem. And i have no idea what to do about the Tivo.

All of the devices except the TV and plugged into a Panamax power unit, and outside the house both cable and sat lines are grounded to the main house ground. I tried the cheapo radio shack inline devices between the Denon and my amps, and it did nothing. Any other ideas?
  Reply With Quote
Old 6th June 2005, 03:57 PM   #2
jan.didden is offline jan.didden  Europe
diyAudio Member
jan.didden's Avatar
Join Date: May 2002
Location: The great city of Turnhout, BE
Try to disconnect the TV MAINS plug. That may give a clue as to the cause of the hum.

Jan Didden
Advertising is the rattling of a stick inside a swill bucket - George Orwell
Linear Audio pubs and articles . The SilentSwitcher now at diyaudio store SilentSwitcher
  Reply With Quote
Old 8th June 2005, 03:15 PM   #3
soongsc is online now soongsc  Taiwan
diyAudio Member
soongsc's Avatar
Join Date: Mar 2005
Location: Taiwan
Start with the system setup that does not have hum. If you add a device and it causes hum, reverse the polarity of the AC plug and see if it changes.
Hear the real thing!
  Reply With Quote
Old 26th June 2005, 12:43 PM   #4
Collo is offline Collo  Australia
diyAudio Member
Collo's Avatar
Join Date: Nov 2004
Location: Newcastle, Australia
Send a message via MSN to Collo
hello madpoet,

I put together a page on minimising hum due to earth loops.
It should help you to identify where a loop exists and what you can do about it:


Ports rule!
  Reply With Quote


Need help eliminating humHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Need Help eliminating hum on a Aikido headphone amp wonsup Headphone Systems 36 14th November 2009 09:29 PM
Eliminating Internal Waves villeneuve Multi-Way 4 15th February 2009 08:08 PM
Eliminating the backwave on a dipole Chris8sirhC Subwoofers 19 6th September 2008 09:37 AM
eliminating FM from source select whiterabbit Car Audio 1 5th May 2008 12:45 AM
Help eliminating hum dsavitsk Tubes / Valves 1 10th August 2006 09:41 AM

New To Site? Need Help?

All times are GMT. The time now is 01:29 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio