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post #1876 of 3934

What bugs me with this noise and hiss from the GO is, that it is dependable of which GO you are using. There are far more complaints with the GO 450 and the GO 720 than with the GO 1000.

 

LH provided measurements against other competing DACs and stated, that theirs is supperior regarding noise floor. Larry used a "real world" 300 Ohm load. But what is a "real world" load compared to the headphones a normal consumer would use? Regarding the small size of the GO and how it was advertised as being comaptible with iOS + CCK and Android via OTG the GO should be a portable DAC and used preferably with portable Cans / iems / ciems.

 

Then there was the demand for more power to drive larger cans. But still, it is a portable DAC. I can't belive, that the noise floor is higher with "dirty" usb power provided by the pc/mac/laptop, because other DACs are noise free.

 

And the 3D Noisifier (I call it Noisifier because of the noise :P) should not make a hissy background. I am happy with my GO 1000, as I don't have sensible headphones, but I can understand the frustration of those, who have GO 450 / 720.

 

They better make the Pulse hiss/noise free, as this is their midfield DAC. And the firmware should be tested thoroughly regarding the volume jumping to max sound with windows OS. Their volume knob is a digital attenuator and works like the buttons on the GO if I remember correctly. Don't want to fry my headphones, because the volume jumps to 100% (7 Vrms) by touching the volume knob...

post #1877 of 3934
I tried a usb isolator and it made no difference. This is self noise due to poor design.
post #1878 of 3934
Quote:
Originally Posted by Anaximandros View Post
 

What bugs me with this noise and hiss from the GO is, that it is dependable of which GO you are using. There are far more complaints with the GO 450 and the GO 720 than with the GO 1000.

 

LH provided measurements against other competing DACs and stated, that theirs is supperior regarding noise floor. Larry used a "real world" 300 Ohm load. But what is a "real world" load compared to the headphones a normal consumer would use? Regarding the small size of the GO and how it was advertised as being comaptible with iOS + CCK and Android via OTG the GO should be a portable DAC and used preferably with portable Cans / iems / ciems.

 

Then there was the demand for more power to drive larger cans. But still, it is a portable DAC. I can't belive, that the noise floor is higher with "dirty" usb power provided by the pc/mac/laptop, because other DACs are noise free.

 

And the 3D Noisifier (I call it Noisifier because of the noise :P) should not make a hissy background. I am happy with my GO 1000, as I don't have sensible headphones, but I can understand the frustration of those, who have GO 450 / 720.

 

They better make the Pulse hiss/noise free, as this is their midfield DAC. And the firmware should be tested thoroughly regarding the volume jumping to max sound with windows OS. Their volume knob is a digital attenuator and works like the buttons on the GO if I remember correctly. Don't want to fry my headphones, because the volume jumps to 100% (7 Vrms) by touching the volume knob...

 

1.  while my GO450 has a black background with Heir Audio 4.AiS and NAD HP50, it appears others aren't so lucky.

which is sad.  and either speaks to QA issues or an inconsistent design across 450/720/1000 models.

still waiting for that audiostream update to provide "independent" measurements of GO450 against other mini DAC/Amps.

 

2.  3D noisifier is right!  it's a completely broken feature for a majority of headphones I suspect.  the fact that it was touted during the kickstarting campaign again points to Gavin the Marketeer hyping and the GO design not living up to it.

 

3.  for 2 days I tried a Schiit Wyrd with my GO450 (and macbook pro retina 13") and Wyrd did nothing to improve sonics or eliminate 3D noisifier.  must mean either macbook pro usb ports are decent quality, or GO450 does a decent job with average USB ports.

 

4.  while I was excited to back Pulse Xfi, am now very worried about their digital volume knob. and another broken 3D "feature".

almost am preferring to re-sell my Pulse Xfi before opening it, and be done with experimenting with their products.

 

Plenty of other reputable and great sounding companies out there like iFi Audio, CEntrance, Schiit

without the headaches or design issues.


Edited by jexby - 8/5/14 at 8:43am
post #1879 of 3934
Quote:
Originally Posted by Anaximandros View Post
 

What bugs me with this noise and hiss from the GO is, that it is dependable of which GO you are using. There are far more complaints with the GO 450 and the GO 720 than with the GO 1000.

 

LH provided measurements against other competing DACs and stated, that theirs is supperior regarding noise floor. Larry used a "real world" 300 Ohm load. But what is a "real world" load compared to the headphones a normal consumer would use? Regarding the small size of the GO and how it was advertised as being comaptible with iOS + CCK and Android via OTG the GO should be a portable DAC and used preferably with portable Cans / iems / ciems.

 

Then there was the demand for more power to drive larger cans. But still, it is a portable DAC. I can't belive, that the noise floor is higher with "dirty" usb power provided by the pc/mac/laptop, because other DACs are noise free.

 

And the 3D Noisifier (I call it Noisifier because of the noise :P) should not make a hissy background. I am happy with my GO 1000, as I don't have sensible headphones, but I can understand the frustration of those, who have GO 450 / 720.

 

They better make the Pulse hiss/noise free, as this is their midfield DAC. And the firmware should be tested thoroughly regarding the volume jumping to max sound with windows OS. Their volume knob is a digital attenuator and works like the buttons on the GO if I remember correctly. Don't want to fry my headphones, because the volume jumps to 100% (7 Vrms) by touching the volume knob...

 

The reason you see more reports on the 450s is the majority of sales were the 450.

 

I've owned five 450s (3 for friends, 2 for me, all of them I've used), 2 GO 1000s, and beta tested the GO 100. I also just purchased a 720 off the forums and will have that soon to test as well.

 

As you move up the line, there is more noise. The crappier my machine, the more noise I get. All of them (AND my other USB powered DACs) improve with my previous iFi iUSB and now my Schiit Wyrd.

 

I own:

  • Dragonfly 1.0
  • Herus
  • Explorer
  • Audioengine D1 and D3
  • ODAC
  • Centrance DACPort
  • HRT MicroStreamer

 

Almost all of them produce some audible hiss (varying in level) when used with my UERMs, especially out of my laptops (Surface Pro 3, previous Macbook Air, and a Macbook Pro). 

 

What I will say is that the Geek Out units have the best SQ of the bunch, both tonally and in terms of overall resolution (with the possible exception of the ODAC on a good USB port), especially the Geek Out 450.  

post #1880 of 3934
Quote:
Originally Posted by zerodeefex View Post
 

 

The reason you see more reports on the 450s is the majority of sales were the 450.

 

I've owned five 450s (3 for friends, 2 for me, all of them I've used), 2 GO 1000s, and beta tested the GO 100. I also just purchased a 720 off the forums and will have that soon to test as well.

 

As you move up the line, there is more noise. The crappier my machine, the more noise I get. All of them (AND my other USB powered DACs) improve with my previous iFi iUSB and now my Schiit Wyrd.

 

I own:

  • Dragonfly 1.0
  • Herus
  • Explorer
  • Audioengine D1 and D3
  • ODAC
  • Centrance DACPort
  • HRT MicroStreamer

 

Almost all of them produce some audible hiss (varying in level) when used with my UERMs, especially out of my laptops (Surface Pro 3, previous Macbook Air, and a Macbook Pro). 

 

What I will say is that the Geek Out units have the best SQ of the bunch, both tonally and in terms of overall resolution (with the possible exception of the ODAC on a good USB port), especially the Geek Out 450.  


i contacted LH about my green GO 720...and they informed me that the company is no longer producing the green ones...but that they would send me a black one ASAP. hmm, there was no mention of problems with the production of the green units in any of the threads i had read. wish these kinds of hiccups would be made public as soon as they happen - perhaps in a message to all pulse/GO backers? (duh)

 

anyway, i hope to receive mine soon and compare against the ifi micro idsd and check out the noise floor both with and without the iusb

post #1881 of 3934
Quote:
Originally Posted by kugino View Post


i contacted LH about my green GO 720...and they informed me that the company is no longer producing the green ones...but that they would send me a black one ASAP. hmm, there was no mention of problems with the production of the green units in any of the threads i had read. wish these kinds of hiccups would be made public as soon as they happen - perhaps in a message to all pulse/GO backers? (duh)

 

anyway, i hope to receive mine soon and compare against the ifi micro idsd and check out the noise floor both with and without the iusb

 

Pulse combo backers weren't offered green as an option. The green was limited to Kickstarter backers only.

post #1882 of 3934
Quote:
Originally Posted by AxelCloris View Post
 

 

Pulse combo backers weren't offered green as an option. The green was limited to Kickstarter backers only.


when they offered the upgrade to 720 or 1000 for pulse combo orders, they said pick a color. they never mentioned that the available colors were limited. so if indeed green was only available to KS backers, then they should have mentioned that. second, if that was the case, when i put in my order and paid for it, someone should have told me that green was not an option. third, if indeed there were issues with green production and no greens were being offered, they should have notified people about that, too. so there were many areas in which they failed to keep the customer informed.

post #1883 of 3934
Quote:
Originally Posted by MikeyFresh View Post
 


And this is audible when listening to music, or only when no music is playing?

 

I'm asking purely out of curiosity, not to start a war of words.

 

I own a GO1000, and a CEntrance HiFi-M8, they seem very similar in terms of a low noise/quiet background, either when listening to music or at idle.

 

The M8 is battery powered, the GO1000 of course is bus powered and logically should be noisier because of that, but I use an iUSBPower inline to mitigate any potential noise issues from the computer.

 

I'm also not suggesting all Geek Out owners "need" to run out and buy an add-on such as the iUSBPower to solve some sort of inherent noise problem. ALL of my USB DACs benefit from he iUSBPower, not just the GO1000.

 

It has been asked a few times, me and @miceblue have described it here and in LH Labs forum, but let me describe it again.

 

Mine is GO 450 that seems to have higher noise floor than your GO 1000.

The background noise mostly heard with sensitive IEM, such as my DUNU DN-1000 and DN-2000, and less heard on headphones, especially high impedance headphones. For example, I cannot hear the noise on my HD800.

The background noise especially heard when there is no music, the moment I'm plugging in the IEM. It's quite clear the changes from silent before plugging, and hearing 'hisss' noise after plugging to the headphone output of GO 450.

It is also heard during the soft passages of music.

 

I don't have any of that hiss problem with my other portable DACS such as Dragonfly, DACport, as well as DAPs, using the DUNUs.  The hiss problem is only on my GO 450.

I hope that's clarify.

 

I have requested for second unit of GO 450 from the referral program, and Manny Tores has agrees to send me the second unit. I will compare the second unit of GO 450 with my current GO 450 to see if there is any problem with my current GO 450.

I've waited for more than 3 weeks for it since I reported this problem, but so far no news when it is going to be delivered.  As usual, wait, wait, and wait....

 

I'm going to write a review of GO 450 compared with my other DACs, but waiting for the second unit of the GO 450, for a fair comparison.

post #1884 of 3934

I wonder if the noise is because of the current mode output stage.  Found this on lhlabs forums posted by Larry in a thread talking about the questyle and bakoon current mode amps

 

"(1) Current feedback of amplification is usually faster in slew rate, which will make the signal trace the original music signal in much higher rate in time domain. And that is good for sound quality.

(2) But current amplification also has an issue of current noise and it could not have capacitance in the loop to avoid any potential oscillation. Both are not good for sound quality.

In Geek Out, we use current feedback topology in final analog output stage. It sounds much better than simple voltage buffer output.

In Geek Pulse, since we finally have more PCB space. I will add two more important stuff right after IV signal chain and before analog output."

post #1885 of 3934

I'm just hoping I get the right model shipped to me at this point. Paid for the Pulse X/f/i + 2m Lightspeed 1G, hope the survey and my inputs worked properly.

post #1886 of 3934

No noise with a 1000 running into a home stereo with 97 db speakers...but a much easier load than headphones I guess?

post #1887 of 3934

You are right, the line out has no issue, especially when feeding an extremely high impedance input such as a receiver. But the Geek Out is a portable Dac/amp designed to be used on the move with a laptop and headphone/iem.

post #1888 of 3934
Updates from today:

Geek Pulse:
Quote:
Update 8/07/2014: We've been doing some final tweaking to the Pulse, Pulse X, and Pulse S boards this week and have applied the tweaks to one more Prototype board. The new board's schematic and Gerber layout are done and have been sent to the PCB fabrication shop. The reason we decided to do this is because femto clock shipments have been delayed once again, so we have a chance to sneak in one more improvement to the design. Femto clocks are scheduled to arrive on August 18th now. We don't think this will affect the shipping schedule.

Geek Linear Power Supply:
Quote:
Update 8/7/2014: After a long test under load, Larry's team decided that they needed to increase LPS and LPS4's current capability to 1200 mA constant and 1500mA peak @ 12Vrms. This has added the concern of managing heat, which we're trying to resolve. The chassis must remain the same shape, but we have some ideas to use convection the way we do in Da Vinci to keep the heat down. This does put us a little more behind, but we think we can make up some time and still make our shipments happen on the same schedule we announced on 7/24.
post #1889 of 3934
I like the idea of having a beefier power supply. Even if just a little bit
post #1890 of 3934

I can feel the release getting closer..  hopefully the beta people won't be under NDA and can tell us how awesome we are for backing this dac amp

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