help with speaker feedback

J

jr131981

New Member
i just purchased a new desktop and am having a problem with my speakers. they work fine for a while, then they get all kinds of feedback problems, so much that its louder than the music. ive tried plugging the speakers into my iphone and they work fine, which could mean nothing.

i think the problem is that my speakers may be too powerful for the mobo and that i need to buy a sound card.

i have an asus m4a77t motherboard which supposedly has 7.1 HD audio. i figured that since it could support a 7.1 system, my 2.1 system would be fine without a sound card.

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131656

i have logitech z523 40w 2.1 speakers

http://www.newegg.com/Product/Product.aspx?Item=N82E16836121036&Tpk=z523

any help would be greatly appreciated.

thanks
 
Well, if you look at the reviews for the speakers you bought, a lot of them are having the same issue you have. I would return them.

You do have them plugged into the green port on the back of the tower right?
 
jr131981 said:
i have an asus m4a77t motherboard which supposedly has 7.1 HD audio. i figured that since it could support a 7.1 system, my 2.1 system would be fine without a sound card.
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FYI the speaker power is irrelevant. Computer speakers are expecting to see a fairly small signal coming from the computer - enough to power headphones or small unamplified speakers. The main amplifier is in the speakers.

Check the routing of the signal wire to the subwoofer/speakers keeps clear of other wiring as much as possible and that the subwoofer with its amp is not close to sources of electrical interference.

You should also check that the volume for the source you are using is up high. If you have that source at low volume on the Windows mixer and the Master volume high, the noise coming from other inputs will be more significant.
 
yes, they are plugged into the proper port. my very first thought was somehow the cable came loose, bc this is the same sort of feedback that you get if you touch the speaker cable to the metal on the back of the tower.

i have the volumes adjusted properly

unfortunately, when i purchased the speakers (black friday) the first 2 pages of reviews were mostly all positive.

heres what i dont understand. the speakers emit the feedback/humming when connected to the motherboard. when i unplug it, obviously it stops, but when i plug it into my iphone, it works perfectly fine. any ideas what accounts for it only malfunctioning when connected to the motherboard?
 
I would say some sort of interference somewhere or too much power going through them???? If at all possible return them and get a different set of speakers.
 
i sent newegg an email. but, i tried rerouting the big wire that sort of looks like an vga pin to have it away from other wires, and voila, no feedback...at least for now. i will update in a few days just in case anyone else comes across this thread.

thanks for all the help

and would this problem be solved if the wire was better 'covered'? it just seems like being close to other wires shouldnt have an effect if properly 'insulated'
 
jr131981 said:
and would this problem be solved if the wire was better 'covered'? it just seems like being close to other wires shouldnt have an effect if properly 'insulated'
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Low level signal wires should be shielded (braid or film below the outer sheath). I have never taken PC audio wires apart to see if they are. Proper hi-fi wiring is always well shielded.

Slightly more technical: cables should come with the shielding connected to the plugs both ends. However, the shield should only be grounded in one place. In the case of PC audio, within the PC or speakers, but not both. You should not need to check this in your setup - there must be some standard in place between PC manufacturers and peripheral suppliers.

There's not much you can do at the back of a desktop (in particular) which is usually very busy with wires. If you have any cables carrying higher level signals (eg 120 VAC), try to have the low level cables crossing them at right angles to minimize interference. Avoid running those two types side by side for any distance.

I just bought some Logitech Z313 speakers on sale (similar to yours but 25W). They are really excellent for the money. Mine came noise-free!
 
heres an update, it turns out rerouting the wires away from other wires wasnt the actual solution. it turns out there is something wrong with the 'big' wire, the one that goes from the satellite speaker to the sub. after rerouting the wire, which it worked fine, i barely touched, as in i probably wouldnt have moved a feather, the wire and the feedback returned. i messed around with some other rerouting options and messed with the big wire... im going to best buy tonight to buy a pair from them, only to return my bad speaker after xmas.

dont feel like waiting to ship to and from, from newegg.
 
final update, i bought the same speakers at best buy, first tried just switching the satellite that connects to the sub, but same feedback happened, then i switched the entire setup, and it works fine (knock on wood)
 
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