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Guest Message by DevFuse

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Hum


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12 replies to this topic

#1 OFFLINE   ken stokes

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Posted 05 November 2008 - 06:42 PM

I had two additional TVs added to my system today and now I have a major hum in my main system. To fill you in
I was ruining three TVs with one HD DVR.
Today I added two TVs which required a "Multi Switch"
I now have a loud hum on my main system (not new service)

I tried resetting the main unit,an HR-21
I tried disconnecting the boxes on the new TVs
I tried reconnecting the wires on my sound system consisting of:
Tag PrePro - Theta Amp - Five Aerial Acoustics Speakers - Denon DVD - HR

Any suggestions are welcome!

Thanks
Ken

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#2 OFFLINE   curt8403

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Posted 05 November 2008 - 07:05 PM

I had two additional TVs added to my system today and now I have a major hum in my main system. To fill you in
I was ruining three TVs with one HD DVR.
Today I added two TVs which required a "Multi Switch"
I now have a loud hum on my main system (not new service)

I tried resetting the main unit,an HR-21
I tried disconnecting the boxes on the new TVs
I tried reconnecting the wires on my sound system consisting of:
Tag PrePro - Theta Amp - Five Aerial Acoustics Speakers - Denon DVD - HR

Any suggestions are welcome!

Thanks
Ken


get a cheap electrical outlet tester and test all your electric outlets/ there is a loose connection (Floating ground or floating neutral) somewhere in your system
I am no longer connected with Directv or any other satellite provider

#3 OFFLINE   David MacLeod

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Posted 05 November 2008 - 07:06 PM

running out of regulated power?
Dave MacLeod
S.I.H.

#4 OFFLINE   BattleZone

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Posted 05 November 2008 - 07:09 PM

Curt's got it. Some part of the new section of the system introduced a ground loop, which means that everything isn't being grounded back to the same point on the house. Either you've got an ungrounded outlet, or the neutral is touching the ground.

#5 OFFLINE   Justin23

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Posted 05 November 2008 - 07:15 PM

Three TV's with one HD-DVR?!?!?! How was the PQ?

J

#6 OFFLINE   AntAltMike

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Posted 05 November 2008 - 08:31 PM

Search for "ground loop isolator". They cost ten bucks each, do not create a safety hazard, and make most hum symptoms go away.

http://www.cencom94....page.html8.html

#7 OFFLINE   joe diamond

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Posted 05 November 2008 - 11:43 PM

I'll take a shot,

The original rig had a ground block that was grounded. when the multiswitch went in it did not get grounded so the ground loop is produced by the various sets on different circuits experiencing different ground (potential?).....over my head on the engineering.......See if the multiswitch is grounded and if not try to ground it,,,,,,,,see if the hum goes away. Conversely.... if the original rig was not grounded and now is try disconnecting the ground to see if the hum goes away.

From there you are back to what the guys mentioned above;ground loop hum.

Joe

#8 OFFLINE   DJTheC

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Posted 06 November 2008 - 05:28 AM

Wait! You're all wrong! If it's humming, you must teach it the words! You can even harmonize with it!

#9 OFFLINE   joe diamond

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Posted 06 November 2008 - 06:51 AM

It is a..............hum bug!

Joe

#10 OFFLINE   DJTheC

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Posted 06 November 2008 - 10:41 AM

It is a..............hum bug!

Joe


Bah

#11 OFFLINE   jimmyv2000

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Posted 06 November 2008 - 10:55 AM

tho the OP:
are you hearing this hum without an HDMI CABLE?
like using red and yellow audio cables?
on one of my sets i had an audio hum and i bought an Hdmi cable and the problem went away:D
MY 2 cents
Jimmy
Jimmy

#12 OFFLINE   Cmnore

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Posted 06 November 2008 - 02:03 PM

It could also be a bad set of cables. Punish the cables and exploit them. :^D
ROOM 1:
Win7 HTPC - Athlon64 X2 4850e@2.5Gb/ ASUS M3A78-T/BDHD-DVD/ATI HD4670 - 1080p HDMI
HR22-100/AM-21
Sony KDS-60A2000 SXRD LCOS TV
Sony STR-DA5ES/Sony DVP-NS3100ES SACD/DVD

ROOM 2:
XPx64 HTPC - Athlon64 X2 5400+@ 3.2 Gb/ Biostar 790GX A2+/ATI HD4670 - 1080p HDMI
HR21-700/AM-21
Toshiba 42 inch LCD TV

BONUS ROOM:
R22/AM-21
Sony 27" CRT TV
GARAGE:
R22 SD-DVR
Sony 20" CRT TV

SHARED:
SWM-8/slimline DTV dish
Actiontec ADSL wired gateway
Linksys EG005 gigabit switch/OGV200

#13 OFFLINE   BattleScott

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Posted 06 November 2008 - 04:39 PM

Are you sure it's an elecrical hum and not a vibration hum from the HR-21. When I got a new TV table last year I had to put foam rubber pads under the HR20 to silence the vibration. The cabinet shelf it was on was ampifying it so bad you could hear it other rooms...
HR24-500 / AM-21 / WGA54AG
42" Pannasonic Plasma
HR22-100 / 26" LG LCD
Slimline 5-LNB




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