View previous topic :: View next topic |
Author |
Message |
todd ellis A Zillion
Joined: 02 Jan 2007 Posts: 10494 Location: little egypt
|
Posted: Tue Mar 11, 2008 5:49 am Post subject: RF thru monitors |
|
|
ok gearheads ... help! i'm getting faint RF thru my monitors. it is not coming thru the board - so no quality issues ... i only hear it when the room is completely quiet. VERY faint - but there. i am already running everything thru a line conditioner ... any ideas?
btw: there is a b'cast tower about a 1/2 mile north of me and as i listen ... yup, that is the culprit. _________________ "i know philip banks": todd ellis
who's/on/1st?
|
|
Back to top |
|
|
TheVoiceOfBob 14th Avenue
Joined: 05 Oct 2006 Posts: 1411 Location: Pittsburgher in the Carolinas
|
Posted: Tue Mar 11, 2008 6:06 am Post subject: |
|
|
First thing to do would be to find out how it's getting in. The usual culprit is the lines going to the speakers. You could try shorter cables or better shielded ones.
I have other ideas dealing with low pass filters, but I'll wait to see if anyone else has other suggestions before going that route. _________________ Try to imagine a world where there is no such thing as hypothetical situations.
The Voice of Bob |
|
Back to top |
|
|
todd ellis A Zillion
Joined: 02 Jan 2007 Posts: 10494 Location: little egypt
|
Posted: Tue Mar 11, 2008 6:48 am Post subject: |
|
|
hmmm, i just mounted the monitors on the wall --- SO i am now using longer cables ... that's a great place to start. - thanks, bob. _________________ "i know philip banks": todd ellis
who's/on/1st?
|
|
Back to top |
|
|
Yoda117 M&M
Joined: 20 Dec 2006 Posts: 2362 Location: Philadelphia, Pennsylvania
|
|
Back to top |
|
|
Edo Guest
|
Posted: Tue Mar 11, 2008 10:00 am Post subject: |
|
|
Hey Todd,
Are they active monitors with built-in amps? If so, have you tried raising the volume on them WITHOUT anything plugged in to the input of the monitors? If the RFI is still there you should consider shielding them with tinfoil on the inside, or -better yet- isolate the internal amp and shield that. Also take a look at your cables and don't forget to check possible interference on your monitor's PSU's. If another signal 'dances' on your DC, you can be very sure this will be audible in the end.
Good luck! |
|
Back to top |
|
|
todd ellis A Zillion
Joined: 02 Jan 2007 Posts: 10494 Location: little egypt
|
Posted: Tue Mar 11, 2008 10:27 am Post subject: |
|
|
yes, they are active monitors. when i remove the cable the RF is still there. the level setting on the monitor has no effect on the output ... very low no matter how high i turn them up. _________________ "i know philip banks": todd ellis
who's/on/1st?
|
|
Back to top |
|
|
louzucaro The Gates of Troy
Joined: 13 Jul 2006 Posts: 1915 Location: Chicago area
|
Posted: Tue Mar 11, 2008 10:38 am Post subject: |
|
|
Could it be coming from the power cord? Can you clamp that off with one of those ferrite choke dealies? _________________ Lou Zucaro
http://www.voicehero.com
"Well, yeah, there's my favorite leaf!" |
|
Back to top |
|
|
TheVoiceOfBob 14th Avenue
Joined: 05 Oct 2006 Posts: 1411 Location: Pittsburgher in the Carolinas
|
Posted: Tue Mar 11, 2008 10:43 am Post subject: |
|
|
If they are 3 prong, you can try isolating the ground by getting a 2 prong adapter, see if that eliminates the hum. _________________ Try to imagine a world where there is no such thing as hypothetical situations.
The Voice of Bob |
|
Back to top |
|
|
todd ellis A Zillion
Joined: 02 Jan 2007 Posts: 10494 Location: little egypt
|
Posted: Tue Mar 11, 2008 10:56 am Post subject: |
|
|
no luck with the 2-prong adapter - still there. do those ferrite-clip-on-deals really work?
again - this is MUCH lower than the hum of my external HD (when i have it on, of course) _________________ "i know philip banks": todd ellis
who's/on/1st?
|
|
Back to top |
|
|
louzucaro The Gates of Troy
Joined: 13 Jul 2006 Posts: 1915 Location: Chicago area
|
Posted: Tue Mar 11, 2008 10:57 am Post subject: |
|
|
The ferrite thing should help if it fits. _________________ Lou Zucaro
http://www.voicehero.com
"Well, yeah, there's my favorite leaf!" |
|
Back to top |
|
|
Gp Guest
|
Posted: Tue Mar 11, 2008 12:52 pm Post subject: rf line filter |
|
|
Hey Todd,
Try here click
This would be a good place at least to start. You may be able to find a better deal...but this should do what you want....I think |
|
Back to top |
|
|
todd ellis A Zillion
Joined: 02 Jan 2007 Posts: 10494 Location: little egypt
|
Posted: Tue Mar 11, 2008 1:02 pm Post subject: |
|
|
i'm already running everything through one of these _________________ "i know philip banks": todd ellis
who's/on/1st?
|
|
Back to top |
|
|
Jeffrey Kafer Assistant Zookeeper
Joined: 09 Dec 2006 Posts: 4931 Location: Location, Location!
|
Posted: Tue Mar 11, 2008 1:29 pm Post subject: Re: RF thru monitors |
|
|
todd ellis wrote: | btw: there is a b'cast tower about a 1/2 mile north of me and as i listen ... yup, that is the culprit. |
Move. And/or don't record there.
I usually charge for such sage advice, but since you were so helpful with my morning voice, I figured I'd extend the same courtesy, buddy. _________________ Jeff
http://JeffreyKafer.com
Voice-overload Web comic: http://voice-overload.com |
|
Back to top |
|
|
TheVoiceOfBob 14th Avenue
Joined: 05 Oct 2006 Posts: 1411 Location: Pittsburgher in the Carolinas
|
Posted: Tue Mar 11, 2008 1:38 pm Post subject: |
|
|
todd ellis wrote: | i'm already running everything through one of these |
That explains why the 2 prong adapter didn't work.
Does it come out of both monitors? W/O any input cables attached?
If so, can you move one to another room?
I'm wondering if you are picking up something from the wall. It might be mounted right near a power run in the wall.
True story. We had a professor that kept complaining about his monitor going "wavy" at odd times. No real pattern, it would just do it. Tracked it down to someone in the ADJACENT office with a fan that he only turned on when he got hot. It was near his wall and therefore near his monitor. _________________ Try to imagine a world where there is no such thing as hypothetical situations.
The Voice of Bob |
|
Back to top |
|
|
todd ellis A Zillion
Joined: 02 Jan 2007 Posts: 10494 Location: little egypt
|
Posted: Tue Mar 11, 2008 1:45 pm Post subject: |
|
|
touché mr. kafer ... you win today ... but i'll be back ... _________________ "i know philip banks": todd ellis
who's/on/1st?
|
|
Back to top |
|
|
|