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Speaker buzz

post #1 of 11
Thread Starter 

so these are the speakers i have
http://www.microlab.com/?r=51systemen&st=full&id=361

They sound great when im listening to music or playing games, but there is a really loud buzzing noise when im doing nothing with them and theyre just on. This is easily audible over my laptop and just barely louder than my pc

It doesn't seem to be a problem with the power source as my headphone amp doesn't seem to have this problem despite being plugged into the same power bar. I've also plugged the speaker into a wall plug in another room which doesn't have any running electronics and the buzz is still present even though there weren't any inputs either.

So, my question is, what can i do to try and fix this (i have a surge protector on the way since apparently those can help?)

If it really is something wrong with the amp that is included with the unit (see link)
then its probably out of the question for me to fix so my next question is, how would i go about finding a replacement?

AV receivers seem to be the only option but they seem to all be >300ish and if they're that expensive, i might as well get new speakers

 

 

So i have considered a kinda frankenstein solution and i seek the advice of you guys coz ive got no idea if its even feasible 

so i buy one of these things
http://www.ebay.com.au/itm/331197981310

use the optical output from this
http://www.ebay.com.au/itm/331178894184

and then plug my speakers into the 5.1 output on the front

so my concern with this is, will such a cheap 'audio converter' degrade sound quality significantly and also, since it doesnt have an amp, will the amp on the xonar dgx be good enough to power the speakers?

post #2 of 11

most likely is the amp and i don't think it's broken, just maybe bad quality (unless it's unnaturally loud, you may be able to return it). I upgraded from my old integrated amp to a av receiver and the noise went away/decreased dramatically using the same speakers from both setup. Tho i got used to it from my 2 previous audio setup. For example. my Audioengine A2 has some noise too, the noise volume stays the same even if i turn the volume knob all the way up or down to a minimum. 


Edited by imeem - 7/20/14 at 7:27pm
post #3 of 11
Thread Starter 

mm well i figured it was the amp

so in that case, what are my options besides getting an av receiver?
will the solution i mentioned at the bottom of the op work?
I dont really want to sink $50 into the "5.1 audio decoder" if it isnt going to help at all


warranty has passed already since my friend gave it to me just a little after he bought it and i didnt really notice the buzz straight away because my old computer was pretty loud but now that i have a newer, quieter pc, the buzz is really pissing me off

so yeah a return isnt really an option

post #4 of 11
Quote:
Originally Posted by ChaozFlame View Post
 

mm well i figured it was the amp

so in that case, what are my options besides getting an av receiver?
will the solution i mentioned at the bottom of the op work?
I dont really want to sink $50 into the "5.1 audio decoder" if it isnt going to help at all


warranty has passed already since my friend gave it to me just a little after he bought it and i didnt really notice the buzz straight away because my old computer was pretty loud but now that i have a newer, quieter pc, the buzz is really pissing me off

so yeah a return isnt really an option

I would say no, The Xonar DGX you linked is just a sound card, it won't bypass the speaker amp which is built into the sub. same with the 5.1 AC3 DTS HD Audio Digital Sound Decode, it looks like the output is meant for going into the back of the sub's inputs and then output it to all speakers. It's not meant to go from the AC3 DTS HD Audio Digital Sound Decode directly to all the speakers; i don't think it's meant to power all the speakers directly. But i can be wrong tho.

 

To see if your speaker work without the sub, try connecting the Front L and R speakers directly to your computer or TV to see if sound actually comes out. If it does, then those products may actually work.

 

and yea, a/v receivers can't power your speakers because it doesn't support speaker wires and those speaker wire binding post so it seems like you're out of luck. 


Edited by imeem - 7/21/14 at 6:44am
post #5 of 11
Thread Starter 
Quote:
Originally Posted by imeem View Post
 

it won't bypass the speaker amp which is built into the sub. 

 

In the case of these speakers there was a seperate amp which came with them which can be seen in the product photo which i linked in the op 

 

all the speakers terminate in RCA jacks which are then plugged into the amp

 

Here is a picture of the back of the amp (im too lazy to take one myself lol)
http://i1.ytimg.com/vi/d8Uo9XQvTGQ/maxresdefault.jpg


This is why im wondering if the audio decoder i linked in the op would work because all the outputs on it are RCA ones.
LIke i said, i know that the decoder does not have an amp in it which is why im wondering if the amp on the soundcard would make the signal loud enough for speakers to be audible.
I would be using the optical output on the soundcard to plug into the decoder and then plug my speakers into that.

 

and im pretty sure an av reciever would work (correct me if im wrong) since all the speakers terminate in RCA jacks and dont have amps in them or anything

but again id prefer not to resort to this since the cheapest ones ive found are $250+

Also im pretty sure the problem is to do with the included (but separate from the speakers) amp since there wasnt any buzzing when i plugged the speakers into my headphone amp which has 2 RCA outputs 

post #6 of 11
Quote:
Originally Posted by ChaozFlame View Post
 

 

and im pretty sure an av reciever would work (correct me if im wrong) since all the speakers terminate in RCA jacks and dont have amps in them or anything

but again id prefer not to resort to this since the cheapest ones ive found are $250+

 

the cheapest ones i found was $199 in Canada and USA. Also, not all receivers have pre outs for like Front and Surround. It's usually only subwoofers.

 

An example of a receiver with pre outs: RX-V777BT ($800)

 

Receiver with only subwoofer pre outs (which is most of them):

 

Also when you plugged your speaker to your headphone amp, was the volume loud enough?


Edited by imeem - 7/22/14 at 5:46am
post #7 of 11
Thread Starter 
Quote:

Originally Posted by imeem View Post

 

Also when you plugged your speaker to your headphone amp, was the volume loud enough?

 

Yes it was

 

and man sorry but im a bit of a noob 
i dont realy understand everything going on in those pictures you linked

 

i just want something that can make my 5.1 speakers work without buzzing and is relatively cheap T_T (<$100 if at all possible)

 

post #8 of 11

if you have a receiver like in the last picture (which is most receivers), your speakers will not work because it doesn't use the same wiring; it does not use RCA to output to speakers, it uses plain speaker wires. This was why i said receivers won't work with your speakers. If you have the receiver in the first picture, it may work but according to the manual, it's not meant for connecting to speakers directly : http://download.yamaha.com/api/asset/file/?language=en&site=usa.yamaha.com&asset_id=62158 page 31

post #9 of 11
Unfortunately, they don't seem to make their manual available online, so my question is - what gets plugged into the sub? Need to figure out if that box is the power amplifier or just a pre. 
 
But from what I can tell, the setup as it's 'supposed to' work is that you have passive speakers powered by an amp that inexplicably uses RCA cables to send the amplified signal to the speakers. If this is true, you do not want anything that is feeding a line-level (pre-out) signal to those speakers. Thus, your original plan would not work (just decodes the surround signal and splits it into line level outputs), and the pre-outs from something like the RX-V777BT would be pointless. If you like those speakers, and want to invest in an AVR to power them, you'd simply terminate some speaker cable in RCA connectors on one end. Or, if you're not going to be using the original amp ever again, chop the connectors off of one end of the original cables. Either leave them as bare wire threaded through the hole in a five-way, or slap on some banana plugs. 
 
A better idea of how everything originally connected (particularly with respect to the sub) would be good to know though.
post #10 of 11
Quote:
Originally Posted by brhfl View Post
 

manual for OP's speaker: http://www.microlab.cn/UploadFiles/20091112224823811.pdf

post #11 of 11
Quote:
Originally Posted by imeem View Post
 

manual for OP's speaker: http://www.microlab.cn/UploadFiles/20091112224823811.pdf

Huh, I swear I looked!

Well, anyway, it looks like they are indeed just passive speakers that (again, inexplicably) use RCA terminations on the speaker cable. So connecting them to an AVR should be a simple matter of having cable terminated in RCA plugs on one side and banana plugs (or bare wire, or lugs, or whatever) on the other. Using pre-outs or other line-level outputs (as in OP's original plan) won't work, if the whole plan is to bypass the original amp. This is precisely the reason it's such a bizarre choice to use RCA jacks for speaker terminals...

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