• Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
    Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.

line noise

C

Ch1m3r4

Gawd
Joined
Apr 11, 2003
Messages
870
I have an abit nf-7s in a lian li and I am getting noise on the line out.
Out of my 2.1 computer speakers I can hear a low hum anytime they are on (and plugged in to the computer).
When I output to my receiver, the hum is much louder, a nice low bass humming.

What is causing this and can I get rid of it? It is bearable on the 2.1s, but out of the receiver it isn't bc my cerwin vegas seem to really like whatever frequency it is and play it fairly loudly.

please help.
 
hmm...could be.

could it be due to poor grounding within the case itself?
I used to get shocked fairly easily when touching the case. If this could cause it, how does one fix poor case grounding?

on a note related to ground loop...
the computer is plugged into a UPS (not a true UPS, but one of the home APC brands that you can buy that are actually called something else). However, it is on the surge protector only side bc it draws too much power for the battery backup side (I upgraded my computer but not the UPS)
the receiver is plugged into a powerstrip, which is plugged into the wall. I tried a different powerstrip, but did not try straight to the wall yet.

any other info? I will try out some of the other things in that doc when I get home this afternoon.
 
the ups should do line filtering, that should at least help with the ground hum. Try plugging the speakers into the ups as well if they're seperately amped. wait, lemme get this straight. your setup us computer -> reciever with digital (?) -> speakers via analog (?). if i'm right, then all the components should be on the same circuit. this will help eliminate hum. you can also try plugging something else into the reciever (cd player) to see if the computer is causing the problem or the reciever. If it's the computer causing the problem, check your southbridge cooling. my brother was getting a crackling intermittently and when he put a heatsink on the sb it stopped.

your computer should be properly grounded already. the round pin on the computer power plug is connected to a ground inside the power supply, so this grounds everything. could you be accumulating static and then zapping yourself against a ground? did you get zapped on doorknobs in the same room?

if this doesn't help, consider borrowing a soundcard and see if that helps. good luck.
 
actually receiver is not hooked up through optical currently

I switch the cables when needed.

This is because the receiver is all the way in the other room. I am using 1/8" to rca adaptor and then a long length of monster rca cables. The connection to the speakers is just an 1/8" headphone cable that goes from computer to amp/sub of 2.1 setup

I am pretty sure it is computer and not receiver bc the hum stops when I unplug the cable from the back of the computer. I could check southbridge cooling, but I currently have a passive heatsink on it + decent case airflow.

I get zapped by everything, so yeah, perhaps I am the one accumulating charge. My car shocks me each and everytime I get out of it if I don't remember to grab door THEN step onto ground :)
 
AH haaaa....reciever setup eh? you got a coaxial cable hooked to your TV & RCA cables to receiver then also got computer hooked to receiver then you will find the Coaxial cable is the source of your noise...if you don't believe me try unplugging the tv from your receiver and just have computer hooked through it and it won't buzz... I too use a SONY receiver and surround sound for speakers, and can't have tv & comp. plugged in at same time or it buzzes.
 
well slap me silly and fuck me stupid.

unplug from tv and/or unplug cable line and it works. stupid shite apartment wiring crap. thanks for the input!
 
Apparently the noise is from poor ground in the coax. going into your TV. you'll have to ground the cable to an electrical boz ground or ground in your phone like works really well.
 
well i'll be dammed. if you have a cheap rca switching box try putting that outside the reciever:
cpu ---+
box ---->reciever
tv ---+
and see if that gets rid of it. the reciever will only see 1 device and you switch between them with the selector box. radio shack has these. they're actualy for analog data but it's just electrical signals interpreted by the reciever to mean digital, so it should work anyway.
 
You must log in or register to reply here.
Back
Top