Head-Fi.org › Forums › Equipment Forums › Computer Audio › Audio Engine A5+ with SVS Sb-1000 Hissing/ humming sound from speakers. Electrical interference?
New Posts  All Forums:Forum Nav:

Audio Engine A5+ with SVS Sb-1000 Hissing/ humming sound from speakers. Electrical interference?

post #1 of 15
Thread Starter 

Hi guys,

 

I just got my SVS SB-1000 subwoofer today, and i'm not sure what's happening..

 

When I plug everything up I hear a hissing, humming sound from my A5+ that wasnt there before hand, or became more pronounced. 

 

This is my setup:

 

USB cable > Audio Engine D1 DAC > Output of DAC > to Input of A5+ > Output of A5+ > SVS SB-1000.

 

 

When I plug everything this way even with the subwoofer off, but powered, I get a humming noise in my A5+. 

 

What I've tried:

 

1) Changing RCA Cables.

2) Connecting my DAC to external power and using optical input.

3) Connecting the DAC to my laptop on battery power (humming goes away), but comes back in my speakers as soon as I plug into AC Power.

4) Unplugging my subwoofer AC power (humming goes away, as soon as I plug it back in it comes back).

4) Using different electrical outlets and power strips, all of which do not have dedicated shielding to electrical noise.

 

 

 

 

Even when the humming goes away in the scenarios I've described I still hear some white noise in my A5, are they damaged? Is this electrical noise?

 

RIght now, I'm managing with it, I noticed the humming is reduced if I turn down my A5 volume to around 45% and only use my DAC as volume.

 

 

I cant figure this out, I initially thought the noise was coming from my PC case not being properly grounded, but it confirmed with my work laptop also, whenever AC power is applied.

 

 

What do you think?

post #2 of 15
Sorry. I have an SB-1000. No problems. But I'm not using Audioengine A5+s.

Sure it's not a ground loop issue?
post #3 of 15

Sounds just like a ground loop issue to me.  This little device may just cure it http://www.amazon.co.uk/Behringer-MICROHD-Hum-Destroyer-HD400/dp/B000KUD2G4 and if it doesn't do the job you can most likely return it to amazon for just the price of postage.

 

Other similar products are available but this is one I have used and is at a reasonable price.

post #4 of 15
Thread Starter 
Thanks for the help guys, am I connecting this properly? With rca cables? Or do I need to connect the a5 directly to the sub with speaker cables?

I'm starting to think my a5 is defective...

Even with the sub completely disconnected and unhooked I still get some white noise. Is this normal?

As soon as I plug in the sub and hook it into the a5 output, the noise gets amplified.


Can someone also tell me if I'm supposed to plug into the LFE input in my subwoofer? Is this bad? It doesn't have a separate input and LFE. Remember this isn't for HT, it's a computer 2.1
Edited by exhibitO - 4/2/14 at 3:09am
post #5 of 15
Thread Starter 

Sorry for the multi-post, but something is definitely messed up...

 

 

It seems to be resolved, I plugged my DAC with external power and used Digital Output to the DAC from my PC. 

 

Maybe the DAC is bad?

 

 

As soon as I attempt to plug in the DAC via USB (while the device is powered) it has interference, however, when I plug the DAC via USB to my laptop on battery power, it's fine.

 

I'm scratching my head, guys.

post #6 of 15

Its a ground loop , Try plugging your laptop and dac digital sources into separate sockets or different power strip to your speakers and sub which are analog , or try rca cables with a lower shield resistance (copper braid ideally), or you can try a phono rca ground loop isolator.

post #7 of 15
Thread Starter 

Hello JRG1990,

 

 

To clarify, my laptop is the control in this experiment. It does not have digital out, only USB. My PC has both Digital output and USB. 

 

I tried plugging in the DAC to a different strip than everything else but it still happens. If it is indeed a ground loop, it appears all the outlets in my living room are sharing a common ground node.

 

 

Thanks,

post #8 of 15

Try connecting up the sub differently, Audio Engine D1 DAC > SVS SB-1000 > A5+ input.

 

Thats the proper way of doing it anyway so you can use the subs high pass filter.

post #9 of 15
Quote:
Originally Posted by JRG1990 View Post

Try connecting up the sub differently, Audio Engine D1 DAC > SVS SB-1000 > A5+ input.

Thats the proper way of doing it anyway so you can use the subs high pass filter.

That's how I run mine. Set the low pass filter crossover on the sub to 80hz. This will be the more optimal configuration as the SB-1000 will be better at producing bass below 80hz than the A5+.
post #10 of 15
Thread Starter 
Quote:
Originally Posted by JRG1990 View Post
 

Try connecting up the sub differently, Audio Engine D1 DAC > SVS SB-1000 > A5+ input.

 

Thats the proper way of doing it anyway so you can use the subs high pass filter.

 

 

Quote:
Originally Posted by cel4145 View Post


That's how I run mine. Set the low pass filter crossover on the sub to 80hz. This will be the more optimal configuration as the SB-1000 will be better at producing bass below 80hz than the A5+.

 

 

Thanks, I changed the way it was connected, do you guys have any idea why the DAC is acting crazy on USB power?

post #11 of 15
Sometimes computers don't quite output the correct power for the needs of the DAC. Could be the fault of the DAC design or the computer design. Or both.
post #12 of 15

I don't think it's the dac it's some sort of ground loop , 50hz/60hz hum or buzz is a ground loop. 

post #13 of 15
Thread Starter 
Quote:
Originally Posted by cel4145 View Post

Sometimes computers don't quite output the correct power for the needs of the DAC. Could be the fault of the DAC design or the computer design. Or both.

Happens on my laptop, too. Obviously I cant power my PC on battery since I don't have a UPS. It seems to work on DC power, once I plug my laptop in the wall the buzzing starts, its not there on battery power.

 

Its always present on my PC since it's always plugged in.

 

Still sounds like a ground loop?

post #14 of 15
Quote:
Originally Posted by exhibitO View Post

Happens on my laptop, too. Obviously I cant power my PC on battery since I don't have a UPS. It seems to work on DC power, once I plug my laptop in the wall the buzzing starts, its not there on battery power.

Its always present on my PC since it's always plugged in.

Still sounds like a ground loop?

Yeah. I think you are definitely right about the ground loop being the most likely problem. While not a long term solution, some cheap cheater plugs would let someone figure it our pretty quick. (You should not use cheater plugs except to find out if they eliminate the problem.)
post #15 of 15
Quote:
Originally Posted by exhibitO View Post

 

 

 

Even when the humming goes away in the scenarios I've described I still hear some white noise in my A5, are they damaged? Is this electrical noise?

 

is the noise the same loudness regardless of the volume of the speakers? if it's a yes, then I have this with my A2s and sum other 2.1 speaker too, tho my A2s were quieter. I think its a "design flaw" and nothing you can do about it. Other than buying different speakers and seeing if it has it too. I also have this with 2 other passive speakers. I think it's a miss or a hit because other than these incidents, my other speakers never had this. 

New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Computer Audio
Head-Fi.org › Forums › Equipment Forums › Computer Audio › Audio Engine A5+ with SVS Sb-1000 Hissing/ humming sound from speakers. Electrical interference?