Nasty RFI problem with my monitors - Page 2

h4nc0 · 12th August 2010

Quote:

Originally Posted by Matt Syson

Hi
Is it only 1 radio station (difficult to tell I know!)?
Sounds like these should be going back to the dealer / manufacturer however, contact the manufacturer first and get their take on this. At least they should send you some ferrite rings / filters or whatever. If no joy, send them back.
Matt S

Not so sure if it's multiple stations, but it seems like it's only one station but with alot of static. My dealer is going to contact the manufacturer and if all fails, I am going to ask for refund.

However, I really hate to return these because I got a great deal on it and love 'em, other than the RFI.

LMNproyect · 23rd March 2011

hi, im investigating about this also , i have a VXT4.

something that helps to keep put the RFI at 95% was this:
Put a new little cable on the head (ground ) of the TRS cable that is conected to the VXT , and then conect this new cable to the upper screw of the VXT back panel. Dont know why exactly but works.

Matt Syson · 23rd March 2011

Hi
This suggests that the RFI protection of these monitors is not as it 'should' be.
You could also experiment with ferrite cores to see if you can reduce it further.
Pin 1 of an XLR or sleeve of a jack must be bonded with a very short link to the chassis at the connector so that RF flows into the chassis and not the internal audio wiring.
The audio inout should also have a passive RF filter (resistor and capacitor and possibly inductor).
Matt S

poonna · 23rd March 2011

I moved my house again and the problem is gone. The VXT4's are now dead quiet. I guess the place where I lived before must have a very strong RFI.

Radardoug · 23rd March 2011

Do you think we should put this up as a sticky.

In case of rf problems in monitors, move house!

poonna · 24th March 2011

Quote:

Originally Posted by Radardoug

Do you think we should put this up as a sticky.

In case of rf problems in monitors, move house!

LOL, I guess that's one of the definitive solutions.

Matt Syson · 24th March 2011

Hi
Except the new house may be worse!
Matt S

poonna · 24th March 2011

Now that could be a criteria for buying a new house.

Bring your monitors along.

Matt Syson · 24th March 2011

Hi
The next problem is that if it is susceptable to RF noises your mobile, switch mode power supplies (computers etc) and other RF gear will also make it's presence felt.
Matt S

poonna · 24th March 2011

Luckily so far those haven't caused me any real problems. My mobile phones do only when there is a call or an incoming message.

23rd March 2011	#33
Matt Syson Lives for gear Joined: Sep 2004 Location: UK Posts: 4,822	Hi This suggests that the RFI protection of these monitors is not as it 'should' be. You could also experiment with ferrite cores to see if you can reduce it further. Pin 1 of an XLR or sleeve of a jack must be bonded with a very short link to the chassis at the connector so that RF flows into the chassis and not the internal audio wiring. The audio inout should also have a passive RF filter (resistor and capacitor and possibly inductor). Matt S __________________ Matt S www.mseaudio.co.uk

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23rd March 2011	#32
LMNproyect Gear interested Joined: Nov 2010 Posts: 25	hi, im investigating about this also , i have a VXT4. something that helps to keep put the RFI at 95% was this: Put a new little cable on the head (ground ) of the TRS cable that is conected to the VXT , and then conect this new cable to the upper screw of the VXT back panel. Dont know why exactly but works.

23rd March 2011	#34
poonna Gear nut Joined: Sep 2009 Posts: 85 Thread Starter	I moved my house again and the problem is gone. The VXT4's are now dead quiet. I guess the place where I lived before must have a very strong RFI.

23rd March 2011	#35
Radardoug Gear addict Joined: Oct 2009 Location: Northland New Zealand Posts: 334	Do you think we should put this up as a sticky. In case of rf problems in monitors, move house!

24th March 2011	#37
Matt Syson Lives for gear Joined: Sep 2004 Location: UK Posts: 4,822	Hi Except the new house may be worse! Matt S