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| Thread ID: 97483 | 2009-02-17 19:35:00 | Constant Speaker Hum? | VictorStagnetti (14630) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 748801 | 2009-02-18 04:46:00 | No, the hum is gone. It's also gone on my laptop. I also discovered that the orange speaker jack isn't actually connected to anything, and the green jack is driving the front 2 speakers as well as the center and sub channels. I wonder why there even is an orange jack... | VictorStagnetti (14630) | ||
| 748802 | 2009-02-18 04:49:00 | Oh, and I forgot to mention that if I record something with a microphone or direct line on either the back or front panels, the hum is present in the recording. | VictorStagnetti (14630) | ||
| 748803 | 2009-02-18 04:59:00 | You've probably plugged the wrong plugs into the wrong connections | Speedy Gonzales (78) | ||
| 748804 | 2009-02-18 05:02:00 | I've tried them in every configuration I can think of. Could be a sound card driver issue? I'm using the onboard soundcard on my motherboard, but it has it's own driver. Maybe I should look into updating it. | VictorStagnetti (14630) | ||
| 748805 | 2009-02-18 05:07:00 | Umm even if its onboard, you would have to install the drivers or it You didnt install the sound drivers through windowsupdate did you? Have you read the mobo manual, which will show you what goes where? |
Speedy Gonzales (78) | ||
| 748806 | 2009-02-18 05:27:00 | I installed the drivers from the CD when I built the computer, but I hadn't updated them untill just now. I just tracked them down from the Foxconn website and updated, but it didn't make a noticeable difference. Any other ideas? | VictorStagnetti (14630) | ||
| 748807 | 2009-02-18 05:56:00 | Hi VictorStagnetti Ok,we can forget strong magnetic induction hum because the hum is gone when you plug something else into the speakers. When you plug a microphone into the computer the hum is present in the recording. This is not surprising, you have simply replaced one ground loop, (the speakers), with another, (the microphone). You are looking for the magic bullet but I can not help you further if you don't answer all my questions. I repeat: How close does the guitar have to be to pick the hum up? Disconnect the speakers leads from the computer, does the guitar pick up hum? If you plug the headphones directly into the computer do you get the hum? From what you say, I gather the computer mains plug has three prongs, is this correct? If it has then the thing that worries me is when you burn a CD or DVD. This indicates the major cuprit is the computer. Open it up and check the mains earth connection is clean and in place. Check the mains cable for any breakage too. Disconnect mains first. Is it possible to open up the main Logitech main box and simply solder a resistor into one ground lead? BURNZEE |
Burnzee (6950) | ||
| 748808 | 2009-02-18 06:41:00 | The amp starts humming a few feet away. It gets louder as I bring the guitar closer, and it seems strongest toward the front of the case where the hard drive is located. This happens regardless of whether not the speakers are plugged in to the computer. Headphones hum whether or not they are plugged into the computer directly. I've tried plugging them in on the front and rear panels, and there was no difference. The computer power cord has three prongs. I checked where the power cord connects to the PSU, and the connections look fine there. I poked around the case, but I didn't see any broken or bald wires, or anything that looked like a faulty ground. I pulled out all of the motherboard audio leads to the front panel and made sure they were clean. The Logitec box is potentially openable, but it would take some major surgery. I can unscrew the panel where all of the speaker wires enter the box, but I can only pull the panel out 1/4" or so. I would have to cut and re-solder all of the internal wires, and I'm sure that would cause more problems than it would fix. Just out of curiosity, what is the voltage of the wall sockets in New Zealand? I've been there once a long time ago, but I don't remember. The ones over here are 110. |
VictorStagnetti (14630) | ||
| 748809 | 2009-02-18 07:47:00 | Hi VictorStagnetti The mains voltage in New Zealand is 240Vac @ 50hz. Think you Yanks have 110Vac @ 60hz. Is that correct? Don't expect you to stuff your speaker set up so don't open it. Everything you say seems to confirm the problem really starts from the computer. Wondering if you are able to confirm true mains earth to your computer using a multimeter. Use this to check continually from the mains plug to the chassis of your computer. If there is a earthing problem here it could be dangerous to you and the computer. If there is true electical earth to the computer and assuming the house mains are earthed correctly, (to check this you might have to move your set up to another house as a test!!), my best suggestion is to buy one Ground Loop Isolator. This simply plugs in between the audio lead and the computer. Test using this lead only. If this works then you can buy as many as you need to to fix the problem. BURNZEE |
Burnzee (6950) | ||
| 748810 | 2009-02-18 16:27:00 | Yeah, ours are 60Hz. I would guess that the house is grounded right because I had it set up in a different location a few months back and still had the issue while wearing headphones. As for the computer itself, I'll see if I can track down a multimeter to check it out Thanks for the help! |
VictorStagnetti (14630) | ||
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