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So Confused (Feedback, cables, and sound card help)

post #1 of 14
Thread Starter 

Alright, I have 2x KRK Rokit 8 G2's, and a Asus Xonar STX sound card.

 

The card has TRS for headphones. But for speakers, it has RCA. So I bought RCA (From sound card) to XLR cables (Plugs into monitors).

 

On the KRK's, I get feedback when the gain is at 0dB or above. So if I go less than 0dB, the music isn't as loud as I like by using windows volume. I REALLY wished I could set the KRK's to 6+dB, and have no feedback.

 

 

Anyways, is the problem my cables or am I just not suppose to have gain that high? I have gain on -4dB, but like I said, it sucks. I have amazing monitors, but can't put the gain higher due to feedback.

 

 

If I unplug the cable from the sound card, then there is NO feedback. So what can I do?

 

Should I do RCA to RCA instead?




Also my cables are Hosa 10" RCA to XLR. My friend said any average cables will sound good. So I trusted him, but now is that my problems? I am thinking of biting the bullet for Mogami cables, but don't know if that'll solve the problems.

 

 

Also is the sound card good for me, or should I have gotten an external DAC? But I figured DAC's were for headphones or something...

 

 

 

Thanks for any help! -Justin

post #2 of 14
Thread Starter 

Edit: Well if it's REALLY quiet in my room, I still hear feedback even with the gain at -4dB...

 

My music friend said to add a mixer or DAC. (Monitors>DAC>Soundcard), and then all my issues will be solved. Is that true?

 

I just want this fixed SO bad...

 

I don't see how I can plug an iPod in directly, and get NO feedback, even at 6+dB, but then I plug into my expensive soundcard, and get feedback issues.

post #3 of 14

I doubt this is "feedback" - can you be more descriptive of what exactly the sound is? My suspicion is that you've got a grounding problem - you can't feed unbalanced into your KRKs? 

 

Your friend is right regarding cables; this is something else. 

 

post #4 of 14
Thread Starter 
Quote:
Originally Posted by obobskivich View Post

I doubt this is "feedback" - can you be more descriptive of what exactly the sound is? My suspicion is that you've got a grounding problem - you can't feed unbalanced into your KRKs? 

 

Your friend is right regarding cables; this is something else. 

 



Thanks man.

 

Well it sounds like alien sounds (Or whatever you call it). But I have noticed when I click my mouse real fast alot, then it gets quieter. Also if I drag my mouse around fast, it's quiet. Then gets louder when I stop.

 

And I thought my cables are unbalanced to the KRK's? I have RCA from the PC to XLR (Monitors).

 

Thanks so much for the help.

post #5 of 14
Quote:
Originally Posted by EliteGeek91 View Post



Thanks man.

Well it sounds like alien sounds (Or whatever you call it). But I have noticed when I click my mouse real fast alot, then it gets quieter. Also if I drag my mouse around fast, it's quiet. Then gets louder when I stop.

And I thought my cables are unbalanced to the KRK's? I have RCA from the PC to XLR (Monitors).

Thanks so much for the help.

It seems more likely that you can hear some kind of interference. Maybe caused by a computer or a monitor. Feedback is generally a single high pitched tone. You can try to test whether it is or isn't interference by turning off your computer (and other nearby electronic devices, notably phones) and using your speakers with an mp3 player or another source than your computer.

Your cables are unbalanced indeed. Balanced cables would require a balanced source as well. See here for some info on that.
Edited by EnOYiN - 3/15/12 at 12:38pm
post #6 of 14
Thread Starter 

Well if I unplug my monitor, the sound is still there.

 

If I plug an iPod directly into them, the sound is gone. It only happens when they're connected to my computer.

post #7 of 14
Quote:
Originally Posted by EliteGeek91 View Post

Well if I unplug my monitor, the sound is still there.

If I plug an iPod directly into them, the sound is gone. It only happens when they're connected to my computer.

Likely it's a grounding issue like obobskivich mentioned. Maybe try some RCA to RCA cables indeed. What kind of cables doesn't matter in my opinion as long as they're not broken that is.

Also I edited my previous post because I typed feedback when I meant to type interference.
Edited by EnOYiN - 3/15/12 at 12:37pm
post #8 of 14
Thread Starter 

You already posted that...

 

Well I think somehow it's fixed (Crossing fingers, knocking on wood, throwing salt over shoulder, etc).

 

My friend who is a sound tech for a band, said to use a different mouse, I did and it's gone! I guess the mouse is bad, or just doesn't work with this setup, I really don't care. I'm so happy right now.

 

 

I also have cheapy Hosa cables, he said to go with Mogami.

 

 

So now I will either buy RCA to XLR, or RCA to TRS 1/4" Mogami's, and be done!

post #9 of 14
By the way, a DAC is a digital to analog converter. It takes 0s and 1s and turns them in to sound. (pretty much anyway) So a soundcard is a sort of DAC. A DAC can also refer to the chip which is responsible for the conversion on a soundcard. Any digital audio device requires a DAC. Be it computer or Ipod or CD player.
post #10 of 14
Thread Starter 

Ahh gotcha.

 


Well for me, what is best? A DAC or a Sound card? Sorry I don't know that much about how DAC's work with my speakers.

 

Since they're analog, I don't need a DAC, right?

post #11 of 14
Quote:
Originally Posted by EliteGeek91 View Post

 

Since they're analog, I don't need a DAC, right?



 

You do.

All file based audio is digital.

All amps are analog.

Obvious you need a DAC= Digital to Analog Converter.

 

What is a DAC?

DAC=a chip doing the DA conversion (engineers speak)

DAC= a box with digital input and analog output (audio speak)

Soundcard= PC speak for a DAC.

 

post #12 of 14
Thread Starter 

Ahh thanks. Gotcha. One final question, then I'll shut up!

 

Which DAC will suit my needs, and be a good brand without breaking the bank?

Also I currently have the below cables. Will I need anything more, since I'll be using a DAC?

2x RCA to male XLR

2x TRS 1/4" to XLR

 

Quote:
Originally Posted by Roseval View Post



 

You do.

All file based audio is digital.

All amps are analog.

Obvious you need a DAC= Digital to Analog Converter.

 

What is a DAC?

DAC=a chip doing the DA conversion (engineers speak)

DAC= a box with digital input and analog output (audio speak)

Soundcard= PC speak for a DAC.

 



 

post #13 of 14

What I meant by unbalanced is that, the XLR inputs are probably a balanced line; that's likely a level mismatch and a floating ground - that can bring in problems. Do the speakers have an RCA or otherwise unbalanced/single-ended (SE) input? Take that from your RCA outputs and you're done. You do not need any extra gear aside from your soundcard, it is correct for what you are doing. And your friend (not to be rude) is wrong about the cables (at least based on what you've posted; I have no idea what he/she is thinking inside) - if they work they work. 

 

 

post #14 of 14
Thread Starter 
Quote:
Originally Posted by obobskivich View Post

What I meant by unbalanced is that, the XLR inputs are probably a balanced line; that's likely a level mismatch and a floating ground - that can bring in problems. Do the speakers have an RCA or otherwise unbalanced/single-ended (SE) input? Take that from your RCA outputs and you're done. You do not need any extra gear aside from your soundcard, it is correct for what you are doing. And your friend (not to be rude) is wrong about the cables (at least based on what you've posted; I have no idea what he/she is thinking inside) - if they work they work. 

 

 



Gotcha, thanks man.

 

Yeah on the monitors (Speakers), they have XLR, RCA, and TRS 1/4" connections. I had a RCA to RCA cables (For TV), plugged it in, and got lots of static. But I guess that isn't even made for sound haha.

 

 

But just tell me which Mogami cables to buy, and I will. I was thinking RCA (From sound card), to XLR. But I see your point now. One has a ground, when the other side doesn't.

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