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post #13591 of 18094
Quote:
Originally Posted by headphonatic View Post
 

There's another problem now. Turns out, its not a grounding issue, it's just that my DAC is picking up noise from my PC. When I unplug my DAC, but keep the DAC plugged into my PC via USB, the noise is still there. Any suggestions?

 

Anti-static spray? lol, I'm about to crazy from this noise

What do you mean by unplug the DAC but keep the DAC pugged into the PC via USB? What exactly is being unplugged?

post #13592 of 18094
Quote:
Originally Posted by hifimanrookie View Post


on the better amps u can hear it longer until its totally silent, because u will hear the most quiet (the last tone) tone of that cymbal strike, partly because the noise level is so low...

But for the rest i agree with u my friend...ofcourse an amp cant prolong the cymbal strike. its as recorded..period, but on the right amps u hear it longer as the noise level is lower, or the amp is just not good enough to pick up/portait those last (most quiet) tones until its really dead... Its same like good speakers...the better the amp and speakers..the more u hear in ur music.

You must be referrring to amps with a horrible S/N ratio (SNR) or DR. The results of an amp with 100 dB or greater SNR or DR will not give you any meaningful difference in perceiving the decay of a musical note as the time spent at these levels in miniscule. No violin or horn, etc player can hold a note at such low levels. The decay times of plucked strings are too short. If it's an electric guitar with sustain due to overdrive, not only is the noise level of the instrument huge, the sustain will keep it well over the noise floor of the amp. This may be more of a case for test equipment rather than human beings. If someone buys some unknown $50 fleabay amp with a terrible SNR, they shouldn't expect too much. Most decent SS amps have an SNR at or well above 100 dB. You'd be surprised at the number of well respected tube amps come in at just over 90 dB.SNR and their owners aren't displeased with decay due to the noise floor.

post #13593 of 18094
Quote:
Originally Posted by StanD View Post

What do you mean by unplug the DAC but keep the DAC pugged into the PC via USB? What exactly is being unplugged?
I meant the power plug, sorry. Hifi's method makes sense though.
post #13594 of 18094
Quote:
Originally Posted by headphonatic View Post


I meant the power plug, sorry. Hifi's method makes sense though.

OK, the DAC has no power but is plugged into the PC. Then when listening (headphones plugged into) where do you hear the noise? The DAC is off, right?

Are you using a laptop or desktop PC?

Hifi's use of a Hub with a laptop might still be a grounding issue as he said that when using the laptop's normal audio out, it was without noise. If his laptop had noise issues I would have expected it to come through "the normal audio out." It is also possible his laptop had a really bad supply with an enormous dose of noise on the 5V supply riding out on the USB cable. So he could have had a defective laptop, he doesn't like to buy cheap stuff. I use an inexpensive laptop (11 inch touch screen WIndoze 8.1) to push music through the USB to my DAC and have no issues when on batteries or AC mains with our wothout a Hub.

Some of these ground related noise/hum/buzzing issues can be a real PITA to solve. Sometimes uou have to be persistent, like a hound dog to solve these. Track it down and don't be fooled by what may seem as the first answer that works, sometimes it's more than one realizes at first. Good luck.

post #13595 of 18094
Quote:
Originally Posted by StanD View Post
 

OK, the DAC has no power but is plugged into the PC. Then when listening (headphones plugged into) where do you hear the noise? The DAC is off, right?

Are you using a laptop or desktop PC?

Hifi's use of a Hub with a laptop might still be a grounding issue as he said that when using the laptop's normal audio out, it was without noise. If his laptop had noise issues I would have expected it to come through "the normal audio out." It is also possible his laptop had a really bad supply with an enormous dose of noise on the 5V supply riding out on the USB cable. So he could have had a defective laptop, he doesn't like to buy cheap stuff. I use an inexpensive laptop (11 inch touch screen WIndoze 8.1) to push music through the USB to my DAC and have no issues when on batteries or AC mains with our wothout a Hub.

Some of these ground related noise/hum/buzzing issues can be a real PITA to solve. Sometimes uou have to be persistent, like a hound dog to solve these. Track it down and don't be fooled by what may seem as the first answer that works, sometimes it's more than one realizes at first. Good luck.

Thanks for the answer, and thanks Hifi for your suggestion too. I have a desktop PC, and the noise appears whether the DAC is on or off.

 

If the USB hub does prove to work, I'll make sure to check it with a meter. 

post #13596 of 18094
Quote:
Originally Posted by StanD View Post

OK, the DAC has no power but is plugged into the PC. Then when listening (headphones plugged into) where do you hear the noise? The DAC is off, right?
Are you using a laptop or desktop PC?
Hifi's use of a Hub with a laptop might still be a grounding issue as he said that when using the laptop's normal audio out, it was without noise. If his laptop had noise issues I would have expected it to come through "the normal audio out." It is also possible his laptop had a really bad supply with an enormous dose of noise on the 5V supply riding out on the USB cable. So he could have had a defective laptop, he doesn't like to buy cheap stuff. I use an inexpensive laptop (11 inch touch screen WIndoze 8.1) to push music through the USB to my DAC and have no issues when on batteries or AC mains with our wothout a Hub.
Some of these ground related noise/hum/buzzing issues can be a real PITA to solve. Sometimes uou have to be persistent, like a hound dog to solve these. Track it down and don't be fooled by what may seem as the first answer that works, sometimes it's more than one realizes at first. Good luck.
Yes my problem was the bad powersupply of the laptop..CAN U IMAGING THAT A 1200 euro worth of laptop could have such a bad powersupply (no, it was not faulty..i read on a forum this laptopmodel has a bad quality HUGE powersupply)! It somehow transferred the noise into the usb port, dont ask me how.but it did..maybe through the chipset? Who knows..but yeah it was a pita to find the problem..i really broke my head on it..but luckily i am a pc specialist building pc's myself (check my pics).. So i just ran my 'what could be the origin of the problem list' Until i ran into the powersupply problem..so a external hub helped. am now using a different better quality (gaming) laptop until my extreme water cooled pc is ready.

But ur right..its a real pita to find the problem sometimes... U just have to try out all to find the cause of ur problem redface.gif

Ps.. Sometimes its best to use the most simple designed laptop, the more inside the more interference, (my amp is built on same principle..only have 24/192 USB input on my amp) am thinking about buying a mini pc (barebone) super cheap (around 400euro) with a hdd disk inside..

Like this:

http://www.shuttle.eu/products/slim/xs35v2/overview/
Edited by hifimanrookie - 5/10/14 at 3:54pm
post #13597 of 18094
Quote:
Originally Posted by headphonatic View Post
 

There's another problem now. Turns out, its not a grounding issue, it's just that my DAC is picking up noise from my PC. When I unplug my DAC, but keep the DAC plugged into my PC via USB, the noise is still there. Any suggestions?

 

Anti-static spray? lol, I'm about to crazy from this noise

If your Dac is self powered, cut the red / red + black wire in the Usb cable, this got rid of noise for me.  Of course make sure it's a cheap usb cable. ;)  Since I have upgraded my motherboard to one with a usb power disable feature (Gigabyte Z87 G1 Sniper) has worked wonders and I no longer hear noise.   

post #13598 of 18094
Quote:
Originally Posted by headphonatic View Post

Thanks for the answer, and thanks Hifi for your suggestion too. I have a desktop PC, and the noise appears whether the DAC is on or off.

If the USB hub does prove to work, I'll make sure to check it with a meter. 
If u have a desktop pc:

- Open case and Check if the noise gets worse when the cooling fans in the case spin up, and if so..try to find out which ones..i once had a faulty fan connector on one of my motherboards..
- Check if the internal connectors are not loose
- Do u use the upper (or front) usb ports of ur case or the standard ones behind the case? The usb ports not being in back side use cables that run from a seperate motherboard chipset..check that internal cable.
- Try a more powerful powersupply..urs can be faulty or having issues because of the lack of power. 700watts should be enough (Corsair makes some affordable quality powersupplies)
- Disconnect all usb devices (KB, speakers, mouse etc) from u pc except ur dac..and see if that helps..play music..of its silent then its one of ur other devices bugging ur pc
- Try a wallsocket in a different room in thats in a different group.
- Ask a friend to borrow u a external USB hub (or buy one..they can be bought for less then 20euro), or a different laptop/pc

Or do what i do..let someone built u a custommade conditioner(s)!which works on different frequencies and a high quality custommade linear power supply.
But that last one can be a bit expensive wink.gif

And what fluids just said..some motherboards has the means to disable the power usb feature in the bios...do that or go ahead with the cutter..but be careful!
Edited by hifimanrookie - 5/11/14 at 9:16am
post #13599 of 18094

Big fan of schiit here I have a couple of there products.

post #13600 of 18094

Poor headphonatic he's going to lose his mind traking this down.

If your PC has an optical SPDIF and your DAC supports this, give it a try. That would keep the grounds and power supplies isolated between the devices as they would only be coupled via a beam of light, non-electrical, no grounds.

Hopefully you can get past this and enjoy your HE-500 along with the new toys.

post #13601 of 18094
Quote:
Originally Posted by StanD View Post
 

Poor headphonatic he's going to lose his mind traking this down.

In good health my friend. In search of true Nirvana, I have given up all my worldly desires to become a Shaolin monk.

post #13602 of 18094

Listened to them today, and I have to say, if it wasn't for the fact that I have a natural dislike for open cans, I would have bought them immediately. They are easily one of the best sounding headphones I have heard for a long long while.

post #13603 of 18094
I have one problem with HE-500. It tends to fatigue me.
post #13604 of 18094
Quote:
Originally Posted by davidsh View Post

I have one problem with HE-500. It tends to fatigue me.

Do you use velours?
post #13605 of 18094
Quote:
Originally Posted by headphonatic View Post
 

There's another problem now. Turns out, its not a grounding issue, it's just that my DAC is picking up noise from my PC. When I unplug my DAC, but keep the DAC plugged into my PC via USB, the noise is still there. Any suggestions?

 

Anti-static spray? lol, I'm about to crazy from this noise

USB audio peripherals are notorious for picking up noise, however usually only when there's a power source connected. If you have removed the power source to the DAC, and find it still gives feedback/noise when connected to the computer, then you don't have many realistic options.

I'd first test it on a different computer; should it reduce the noise or stop entirely, then start removing various components from your computer until the electrical interference dies down.

Should  that not produce a result, get the USB recabled/reshielded or replace the item with something else entirely.

 

Four out of five USB audio products have always induced extra noise, no matter what computer I connected them to.

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