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Reply With Quotehave you tried grounding the motherboard?
Stupid Buzz! (I have tried everything)
I know everyone is probably tired of posts about this topic, but I have searched and searched and tried everything but I cannot solve this problem. My computer in my car worked great with a very small but tolerable hum, until just recently when I installed an amp to power my speakers. Now I get a very loud buzz even with the volume all the way down. The buzz only occurs when the computer is turned on; when the inverter is on without the computer plugged into it, there is no buzz at all. Also, the buzz is louder in the right speaker than the left. I have both the power supply of my computer and my 140 watt inverter grounded to the same spot as my sub amp and speaker amp. I have tried separating the rca and speaker wires away from all wires related to the comptuer, but that had no effect on the buzz. Also, I tried plugging the computer into a surge protector and then into the inverter, and this decreased the buzz somewhat, but it was still loud. The audio of my comptuer is connected to the head unit via rca cables plugging into the aux input on my head unit. That's all the info I can think of, please help me somebody!
have you tried grounding the motherboard?
BossTone74
Yes
Ground Loop Isolator
he speaks the truth. $15 radio shack. go now.Originally posted by PatO
Ground Loop Isolator
Car: 1999 Dark Green Mustang GT Coupe
Audio: Alpine HU, JL 6ch Amp, JL Stealthbox and XR series components.
Player: Empeg for now; something custom later.
www.neotechpc.com - Custom built laptops!
Have you tried removing the filter, in the AC power supply? There was a link on here about it. Works awesome.
I change my amplifiers, signal processors all the time and have also encountered "unsolvable" humming noises, that cannot be rectified by grounding, wire routing (even with the power supply fix).
In some cases an RCA ground isolater worked, sometimes it didn't. Sometimes a 12 Volt power supply filter (sold for car stereos) worked, sometimes it didn't.
Each case is different, and you'll just have to hunt it down, by trying various ideas.
I can change a single component in my setup (four amplifiers, 3 signal processors), and I'll have to basically start from scratch troubleshooting any noises.
Oh yeah, make sure your gains are setup properly on the amplifiers. Those things are not volume controlls.
Best Luck......Sdude.
I went and bought a ground loop isolator and it didn't change anything. I don't know how removing the AC power supply filter would change anything because it didn't need to be removed before I got this new amp. Does anyone else have any suggestions?
Inverter
Guy, I had the same problem, It was my inverter, I first used this old 140 watt inverter I got from work and she hummmed like a hoe, I went to walmart and bought a Modified sign wave inverter I bought the big *** 1 for 40.00 or so. that took out the humm all toghter. Its Your inverter.
I'm pretty sure it's not the inverter, #1 because it worked fine before I added the new amp, and #2 because there is no buzz with the inverter on by itself, only when the computer comes on.
smoldyr-- You have to remember that an amplifier is there to amplify, so as you said in your first post, there was a low hum to start with now it's worse. And as for your statement about no buzz with the inverter on but comp off, that is going to happen because the amp isn't getting an input signal...
Try what Jay87T said or look at a way of getting rid of the inverter...
Such is life....
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