What solution do folks use for the dreaded BFD hum? - Page 20 - Home Theater Forum and Systems - HomeTheaterShack.com

Reply
 
Thread Tools
post #191 of 330 Old 04-14-09, 10:31 AM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: What solution do folks use for the dreaded BFD hum?

Try www.avcables.com They'll make up pretty much anything you want. That's GEPCO's shop.

Bryan

I am serious... and don't call me Shirley.

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
Sponsored Links
Advertisement
 
post #192 of 330 Old 04-14-09, 10:39 AM
Elite Shackster
 
Sonnie's Avatar
 
Join Date: Apr 2006
Location: L.A. (Lower Alabama)
Posts: 22,577
My System
Re: What solution do folks use for the dreaded BFD hum?

I have also had Blue Jeans Cable make me a few specialty cables. They are friendly and easy to work with.
Sonnie is offline  
post #193 of 330 Old 04-14-09, 10:58 AM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: What solution do folks use for the dreaded BFD hum?

Sure. If BlueJeans will make up custom things, they're great to work with and reasonable prices.

Bryan

I am serious... and don't call me Shirley.

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
 
post #194 of 330 Old 04-15-09, 02:21 PM
Shackster
Bryan
 
Join Date: Feb 2009
Posts: 11
Re: What solution do folks use for the dreaded BFD hum?

I might try Blue Jeans. I've purchased some cables from them in the past, and they've been great to work with. I put in an RFQ with AVcable yesterday, but haven't heard back from them yet. I really don't expect a reply at this point, as I'm sure a request like mine is extremely small potatoes compared to other custom jobs they're asked to do.
bbeck is offline  
post #195 of 330 Old 04-15-09, 04:20 PM
HTS Senior Moderator
 
bpape's Avatar
Bryan Pape
 
Join Date: Sep 2006
Location: Wildwood, MO (St. Loui
Posts: 5,288
Send a message via AIM to bpape Send a message via Skype™ to bpape
Re: What solution do folks use for the dreaded BFD hum?

If you do use AVCables, calling them on the phone is usually the best way.

Bryan

I am serious... and don't call me Shirley.

Bryan Pape
Lead Acoustician/Owner
Sensible Sound Solutions
bpape is offline  
post #196 of 330 Old 04-22-09, 02:31 AM
Shackster
 
Join Date: Feb 2009
Posts: 71
Re: What solution do folks use for the dreaded BFD hum?

I was using a 2.5k -40db, BW of 60 filter on the BFD, but after I introduced the Reckhorn B1, I don't think I need it anymore.

The hum was simple to locate using the REW sine generator.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Onkyo TX-SR806, 3 Yamaha NS-777, 2 NS-333, Panasonic PT-AE2000U

To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
VERTIGGO is offline  
post #197 of 330 Old 05-02-09, 11:34 PM
Senior Shackster
 
waldo563's Avatar
Lester
 
Join Date: Apr 2009
Location: Longmont, CO
Posts: 177
My System
Re: What solution do folks use for the dreaded BFD hum?

Quote:
bobgpsr wrote:
Most users just try to use one common power strip for all the audio equipment that uses 3 conductor power plugs, but any equipment that only has a two prong AC power plug should have a seperate wire running from the equipment's gound connection to one of the power strip's safety ground sockets or to the metal chassis of the power strip. Don't have the RCA audio interconnect cable shields providing the only earth ground for any audio equipment (esp the two prong AC powered ones) if you are working to reduce hum pickup to a minimum.
bobgpsr,
I have been following your postings and I think you may be onto something. I have been fighting a hum issue with my Onkyo TX-SR606 AVR which seems to be HDMI related and have tried disconnecting various HDMI connections, moving my sub power to the conditioner everything else is plugged into, disconnecting the Dish cable from the DVR, and have run a separate ground from the cable ground block to the Air Conditioner junction box conduit. None of these has made a perceptible difference. I just realized that this AVR has a two-prong power cord and suspect that may have something to do with it. Unfortunately, unlike the Yamaha, the Onkyo does not have a chassis ground post. Do you see any risk in running a ground wire from one of the chassis screws to a ground point on my Monster HT-800 power conditioner? Also, what do you think would be the best way to connect to the power conditioner as it has a plastic case and no ground points that I can see.
Thanks for your informative input to this thread.
waldo563 is offline  
post #198 of 330 Old 05-04-09, 12:50 AM
New Member
Scooter
 
Join Date: May 2009
Posts: 2
Re: What solution do folks use for the dreaded BFD hum?

Quote:
Mitch G wrote: View Post
I'm a big believer in standing on the shoulders of giants.
In this case that means I would like to know what solution folks use for addressing The Hum.

So, what are you audio giants using to address The Hum?

Mitch
I find that mostly the humming is because they don't know the lyrics.
Scooterp7 is offline  
post #199 of 330 Old 05-04-09, 09:32 AM
Shackster
John
 
Join Date: Jan 2007
Location: Virginia Beach Va.
Posts: 14
Re: What solution do folks use for the dreaded BFD hum?

Quote:
NEO Dan wrote: View Post
Apparently there are lots of "quality" AVR's out there that have some difference of potential between the Chassis Ground and the Phono Ground that it makes an audible difference.

I run my EP2500's bridged with the gains full open, and it's significantly quieter with the shield connected at both ends.
Since the folks here are such big fans of Jensen (myself included, owning several IsoMax units, and diy JT-11 trannys) they should be aware that your proposal is suggested by Bill Whitlock of Jensen in his #AN-003 white paper:


"4 - ABOUT UNBALANCED CONNECTIONS
Please note that, in all the schematic diagrams, connections to the
unbalanced IHF plug (formerly the "RCA plug" or "phono plug") are
shown as the single point to join SH (shield) and LO (signal low or !).
This is very important to absolutely minimize the resistance of
any remaining path used by both signal and ground
currents. If connections are made as shown, the only remaining
common path is the contact resistance of the shield connection
between IHF plug and IHF socket. Use a good quality IHF plug with
high spring force contacts and make sure the contact points are clean
and free of oxides.

With a little extra effort, this small remaining shared path can be
bypassed altogether. Leave signal LO connected to the IHF plug
shield, but connect the cable shield directly to the equipment chassis.
If the equipment manufacturer has thoughtfully provided a binding
post or banana jack marked GND, this will be easy. If not, there is
almost always room to mount one and then use a mating spade lug
or banana plug on the cable’s shield."
johnvb is offline  
post #200 of 330 Old 05-04-09, 09:33 AM
Shackster
John
 
Join Date: Jan 2007
Location: Virginia Beach Va.
Posts: 14
Re: What solution do folks use for the dreaded BFD hum?

and one more post for a linky :^)

http://www.jensen-transformers.com/apps_wp.html

Also, I want to add another link to this excellent thread that I didn't notice was here (maybe it is?). This is Rane Notes on the subject, showing all the cabling possibilities. Very helpful:

http://www.rane.com/note110.html
johnvb is offline  
Reply

Bookmarks

Tags
bfd , dreaded , folks , hum , solution

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may 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 is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome