KVR Audio

kenn · Post by **kenn** » Mon Oct 15, 2007 6:16 pm

If possible, try the warranty thing first. Maybe you got a bad unit. Also, can they be returned for for a store credit on something else?

EkleipSiS · Post by **EkleipSiS** » Mon Oct 15, 2007 6:36 pm

SAme problem here with behringer truth b2031...
But only one speaker gets the radio signal...the other is ok...and the one that gets the radio signal,some components burned in it a couple of months ago...still have to send it for repair...
no warranty left for me neither..grrr

DrGonzo · Post by **DrGonzo** » Tue Oct 16, 2007 2:17 pm

Hello again - finally got a reply from Behringer. Quite explaining and they ask me to go for a UPS solution with an RFI filter. Now - a UPS is always a good thing to have, but before I head out spending money, I'd love to hear your opinion about this.

Here is the Behringer statement about this (the support guy said it was a statement, and not a personal address, so I assume I'm not stepping on any toes for posting it here):

RFI problems are always tricky to diagnose and cure. The first thing that I would try is to slightly move your speakers. Doing this will sometimes block the problem frequency and fix your problem. If that does not work I would try out a UPS (Uninterrupted power supply) and these can be purchased at your local computer store. The one you would want to look for would include an RFI filter. This is definitely not a manufacturing defect. It is not even a fault within the Truth monitor. We have sold thousands of these monitors worldwide and the only time that there is ever any problem with RF interference is when the earthing circuit in the building is not correct.
This is not only a problem for audio equipment, it is also a major safety issue. For this reason we would recommend that the owner or manager of the building should contact a state-registered electrician to check the condition of the main power supply earthing in the building.

kenn · Post by **kenn** » Tue Oct 16, 2007 3:10 pm

Sounds like a pretty generic response. If the RF was getting in via the AC connection (which I doubt) then a simple EMI filter should kill it. You don't have to get a UPS. Try to borrow a UPS or EMI filter for some tests, I guess.

DrGonzo, is it just one of your monitors that picks up RF, or both equally? If it's just one, then you can claim a warranty issue on the problem unit for sure.

I'm not completely buying the story about a ground problem. There's a couple ways to check, if you can get your hands on a decent multimeter:

(Disclaimer - be careful. If you're unsure about these types of measurements, please get an expert to do them. )

1) set meter to ac volts, 200v scale initially, and try to measure between the ground terminal of your monitor input, and a water pipe (assuming you have metal pipes for water and/or heat). if you measure more than a volt or two, there might be a ground problem in your building.

2) if the voltage measured in #1 was quite low (say less than 4v ac), try connecting one end of a long wire to a waterpipe and touching the other end to the ground of the monitor input and see if that kills the RF.

elwoodblues1969 · Post by **elwoodblues1969** » Wed Oct 17, 2007 1:31 am

DrGonzo,

I don't wish to add to your frustration with your situation by saying this,but I want to explain something to you about Behringer;

You can,in fact, buy decent quality at silly prices-but the fact of the matter is,is that Behringer just happens to be an anomoly-as that's how terrible the quality is of this particular company.

Behringer clearly has the most defective line of "pro" products on the market,so I would suggest you accept your loss and move on to another brand,instead of pulling your hair out over your Behringer monitors.

Yes,the technology is out there to buy quality at budget prices(even silly ones),but all I am saying is,is that Behringer is plagued with defects-(just like the Alesis Fusion for example)and there is something very sinister going on with Behringer,as far as them cutting too many corners to keep the cost low-more so than any other company that I know of.

My best advice is to sell your monitors to someone who would use the monitors for general entertainment use(meaning that someone who would not be bothered by the interference thing)and invest that money towards a product that you have researched beforehand.

Good luck in whatever you decide,

Thom

Muzik 4 Machines · Post by **Muzik 4 Machines** » Wed Oct 17, 2007 1:33 am

be carefull with radio, if ever someone heard it you could be in trouble

C00kie · Post by **C00kie** » Wed Oct 17, 2007 8:34 am

DrGonzo wrote:it picks up the bloody FM band.

Sure?? Can you find the same station on a regular radio? Sure it's not an AM station?

It's possible to get an AM receiver with just a handfull of simple components (see http://en.wikipedia.org/wiki/Crystal_radio ) but FM requires a very complex circuit. I've witnessed accidental AM reception before. It's NOT related to polluted mains power, but rather a faulty solder joint close to a coil of the cross-over filter that turned into a diode by accident.

What I'd do is open it and check / redo all solder points. But since it's still under warranty I'd return them. Probaly too late to get your money back, but another one should not have this fault. Especially if it's just one that has this defect.

DrGonzo · Post by **DrGonzo** » Wed Oct 17, 2007 11:05 am

Oh yes. I am most sure about the FM band. There is no AM band broadcasting this kind of modern-hey-ho-ultra-dull-hit-music. Sigh. I _think_ I'll go buy an UPS just to make sure. But I really don't expect it to solve my issue.

C00kie · Post by **C00kie** » Wed Oct 17, 2007 11:40 am

DrGonzo wrote:Oh yes. I am most sure about the FM band.

Technically that's close to impossible... (but you never know!)

DrGonzo wrote:There is no AM band broadcasting this kind of modern-hey-ho-ultra-dull-hit-music.

Don't be so sure. Have you checked the AM band on your radio recently?

DrGonzo wrote:I _think_ I'll go buy an UPS just to make sure. But I really don't expect it to solve my issue.

Me neither

[edit]Another thought after reading the Wiki article on chrystal radios: do you use a grounded power outlet? Maybe you can test what happens when it's not grounded through mains. A simple piece of tape on the ground pin might shed some light on it.

DrGonzo · Post by **DrGonzo** » Wed Oct 17, 2007 1:26 pm

C00kie wrote:
DrGonzo wrote:Oh yes. I am most sure about the FM band.
Technically that's close to impossible... (but you never know!)

Hey! I actually live in Hungary/Budapest right now, and I've learned through hard experience that normal rules doesn't apply here

The coming weekend there is this national holiday when loads of people go out and burn cars and try to set fire on TV stations.

C00kie wrote:
DrGonzo wrote:There is no AM band broadcasting this kind of modern-hey-ho-ultra-dull-hit-music.
Don't be so sure. Have you checked the AM band on your radio recently?

Ok ok. You got me...

C00kie wrote:
DrGonzo wrote:I _think_ I'll go buy an UPS just to make sure. But I really don't expect it to solve my issue.
Me neither

[edit]Another thought after reading the Wiki article on chrystal radios: do you use a grounded power outlet? Maybe you can test what happens when it's not grounded through mains. A simple piece of tape on the ground pin might shed some light on it.

Whops... that last thing went completely past me. What should I test?
The house I'm living in is quite old, and I wouldn't be so sure that they were thinking about ground. I could have a problem with that - but how could you tell? By isolating the ground pin?

C00kie · Post by **C00kie** » Wed Oct 17, 2007 1:43 pm

Indeed, isolate the ground pin. Or if you have a power socket or power strip or extension cord without ground: try that.

DrGonzo · Post by **DrGonzo** » Wed Oct 17, 2007 7:28 pm

Cookie and Kenn - today I did an experiment. I put one of the monitors on a wheelchair connected with a looong power extension, trying to identify if there would be any difference if I would place the monitor somewhere else.

And hey-ho. The Behringers are talking bullshit. Maybe no surprise, but I hate when that happens. Very close to my window I can hear the radio quite well. Probably well enough to identify the song and sing with it. If I roll the monitor as far as the cable allows - there are almost no interference. If I press my ear to the tweeter (or what you call the high-frequency element) I _might_ hear something, but it's on the border of "maybe something, and nothing".

Please correct me if I'm wrong in my conclusions here.

a) This test means that location matters for the speakers reception of radio.
b) This means it has nothing to do with the ground or any disturbances in the power.
c) This means that I either have to change place where I work, or buy new monitors.

If the answer is yes to my beautiful logic here. Then everything is clear. The monitors are crap and they will go. But suddenly I feel this irrational surge of punish someone. Hm.

Kas · Post by **Kas** » Thu Oct 18, 2007 6:24 am

Hey people, guess what... I have the exact same problem with my new KRK VXT6 monitors.... I have 3 of them in my 5.1 set up and I use my old berhinger truthB2030a monitors as Ls and Rs. The signal is only picked up on the left side of my desk, when the krk is connected to my Focusrite Saffire LE soundcard. It does not matter which krk is connected to any of the outputs of my soundcard, but when it is on the left side of my desk, the signal pops up.. And moving the monitor to the right takes it away. I have balanced cabels, all powerd on one connector etc..

The funny thing is that when I replace the left krk with one of the berhinger monitors, the signal is gone!!!!

Anyone??

Thanks

C00kie · Post by **C00kie** » Thu Oct 18, 2007 9:19 am

DrGonzo wrote:b) This means it has nothing to do with the ground

Maybe it's not lack of ground but a very good ground that causes this:
http://en.wikipedia.org/wiki/Crystal_ra ... _grounding

So I'd still test what happens when the ground is lifted, since that reduces the ability for the radio-circuit-by-accident to get proper reception.

DrGonzo · Post by **DrGonzo** » Thu Oct 18, 2007 9:41 am

I will head out directly and buy one. By sheer interest... how come you are so skilled about radio?

My monitors are picking up the radio