Hum in one of my 2 monitors

  • Thread starter Thread starter Verraes
  • Start date Start date
V

Verraes

New member
Hi,

Since a month one of my two monitors is constantly suffering from a silent hum. When I listen very carefully the hum appears with a freq of 3 hz.
Has anyone an explanation therefore and more important, does someone know what I can do about it :)

THanks anyway
 
3 hz?

how do you know is 3 hz?

is the cone moving three times per second?
i can only hear from 35 and above

best regard eprg 40
 
I don't think you really have a hum at 3 hz. First, how did you decide that the hum is at 3 hz? Do you know what 3 hz sounds like? I know I don't. It really doesn't sound like anything cause it is really something that would be felt and not translated into meaningful data by our ears. Next, what monitors do you have that are capable of any sort of even nearly accurate response down at 3hz? What equipment do you have that measures as low as 3hz as well?

Now, I can only assume that you are actually referring to 30 hz, and 3 hz was a typo. Even then some of my statements above would apply. Most all monitors on their own would barely have any sort of response that low. Most 8 inch and under monitors start losing a little response at around 80hz and are pretty severely rolled off by 40hz. Now, if you have a hum at say 60hz, than your culprit is likely related to your power (assuming you live in the US or an area where a 60hz ground is used). Since only one monitor exhibits a problem, It may not be the power source itself, but rather how your amplifier (be it rackmountable or integrated into your speaker) is handling that power throughout its whole circuit path. It is also possible that something is wrong up your signal chain that is causing it. The first thing I would do is unplug signal form your monitor (you have to physically unplug the signal cable and not just mute any signal). Does it still hum? If so, the problem is either in your power, or in the amp. If not, then power could still be a factor, but we know it is nopt the amp. Next, take the signal cable that was running into the monitor that buzzes. Put that cable intop your other monitor instead. Does the buzz switch to the other monitor? Now take the cable from that monitor (that was clean) and plug it into the one that was first buzzing. What does it do?

What we are doing here is troubleshooting via signalflow. When I do that I always start at the end of the chain and work backwards. You will keep working yourself down the line until the buzzing stops. That will help you to isolate where the problem exists. If you are lucky, it will simply be a bad cable, or even an AC outlet (you may only have to switch some or all equipment to a new outlet). If you are unlucky, it may be something more intense like a bad output on a console or sound card etc...
 
Thanks for your answers.

What I actually mean is that the hum isn't appearing constantly. It comes up and goes away 3 times per second.

I followed the protocol you suggested and it seems to be the first one. When I unplug the signal (comming from the mixer) the hum is still there. The monitors I'm speaking about are the PS6 from Event. Active monitors

Thanks alot.

Steven.
 
Are both of your monitors plugged into the same circuit? What I would do next is unplug them both on plug each one into the place where the other one was previously plugged in and vice versa. Deos the problem switch sides? If so, it is that socket in your outlet panel. If not, then try switching the actual power cables between the two. If the problem switches sides there, than you know the power cable itself is faulty. Its not that likely, but it does happen and is cheap to replace. If nonoe of this helps, than you can safely assume that something is wrong with one of your powered monitors and it need to be sent in for repairs.
 
/hijack

I was at the car show last weekend and they had a 22" MTX Jackhammer on display and they were pumping 5Hz through it. It looked sooo crazy!!

hijack/
 
Cool. I ha ve some 21" Turbosound subs coming soon for my live rig. Maybe I can get them down to 10 or 15:D
 
Hi,

I tried the thinks you adviced me to do but anyone of them solved the problem. But when I searched for more explanation I suddenly thought about the fact that my father installed a few months ago a wired telephone in here. The telephone didn't work itself but the adapter of it was still plugged. When I removed it the hum finally dissapeared. You guys encouraged me to search for different explanations. Thank you therefore :)

Steven.
 
draw out the schematic and patent it.
you may have just mistakenly invented the first 3hz Hum generator.

And if some smart ass says "I don't hear anything!!"
You just tell them, thats because humans only hear to 20hz, and thats if their theoretically lucky....THIS IS 3 HZ!!!
Then sell them some "optional" 3 HZ Auralex Foam packs, again, acknowledging they won't be able to "hear" the difference.
Then thank them for the $450. and smile.
 
Amp Wise said:
Better check your amplifier, dude. For great integrated amps, just browse the Internet. You'll find tons of them.

_______________
McIntosh MA2275 Integrated Amplifier - MA2275 Integrated Amplifier Catalog by McIntosh Laboratory, Inc.
Click to expand...

WOW, you DO love McIntosh amplifiers? It seems to be your solution to every problem around here.

Hey, I have a blurry monitor on my PC running Cakewalk, do you think a new McIntosh amp will fix it?
 
You must log in or register to reply here.
Back
Top