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Light Harmonic Geek Out EM/1000 Impressions Thread - Page 7

post #91 of 911
Quote:
Originally Posted by cat6man View Post
 

 

something else that would be interesting is a usb cable that breaks out power, and running the power tail to a battery supply.


+1

 

I am thinking about this cable, it looks like the right one pictured but the product description is lacking:

 

http://www.amazon.com/Apricorn-Power-Adapter-Cable-AUSB-Y/dp/B000JIOHDE/ref=sr_1_7?ie=UTF8&qid=1395977846&sr=8-7&keywords=apricorn+usb

post #92 of 911
Quote:
Originally Posted by MikeyFresh View Post
 


I will eventually have both, but my GO 1000 has not shipped yet.

 

I too will be curious being that the GO 1000 is bus powered. The answer you are looking for will be variable for different users depending on how noisy the source computer is.

 

So a dedicated music server that is not multitasking and/or has filtering built-in such as that from SOtM will likely not see too much of a benefit, whereas a multitasking laptop is notoriously noisy to begin with.

 

That said, I have used the iPurifier with both the bus powered Resonessence Labs Herus and the self powered CEntrance HiFi-M8 and both benefit, though more so with my HP W7 laptop as a source than my Mac mini.

 

The other aspect that no one can advise you on is the exact price/performance ratio, each person's wallet is different (as is their partnering equipment and subjective taste too) so it's tough to assure yourself let alone others that the expectation of a $99 sound quality improvement will be met.

 

I kept mine, I thought it was worth using at work on my W7 laptop, but I also think the area of biggest improvement is when using loudspeakers and not headphones, as the image size and focus are more readily heard that way.

 

The iPurifier is simply an EMI filter that also adheres to a strict 90 Ohm impedance right at the DAC's input. The filtering effect is a 5 dB reduction in EMI noise. There are no other grandiose claims being made.

 

The iPurifier is half the price of competing products like the Empirical Audio Short Block, and Ultra Fi Aubisque, which seem similar in design.

 

The iFi iUSB is both a different price point and a different feature set, as it requires AC power to perform "super regulation" of the 5 vdc and also offers separate output jacks for power and data, as well as a ground lift switch.

 

Your mileage on any of the above will vary, depending on how much noise you have coming from the computer riding on either the USB bus power, data, or ground.

 

Hi, from the FFT spectrum we saw from Geek Out. The noise floor with BUS power is comfortably lied on -138~-140dB... Use Battery power will help, but you need a very good system to tell the difference... ;-)

post #93 of 911
Quote:
Originally Posted by MikeyFresh View Post
 


+1

 

I am thinking about this cable, it looks like the right one pictured but the product description is lacking:

 

http://www.amazon.com/Apricorn-Power-Adapter-Cable-AUSB-Y/dp/B000JIOHDE/ref=sr_1_7?ie=UTF8&qid=1395977846&sr=8-7&keywords=apricorn+usb

 

This should work!

 

Make sure you do the A/B test by with/without battery. I would love to know the listening results too... 

 

Enjoy!

post #94 of 911
Quote:
Originally Posted by Larry Ho View Post
 

 

Hi, from the FFT spectrum we saw from Geek Out. The noise floor with BUS power is comfortably lied on -138~-140dB... Use Battery power will help, but you need a very good system to tell the difference... ;-)


Thanks Larry, I have one question regarding the test result vs. actual use with a multitasking computer.

 

Is it safe to say the USB power on the testing equipment is quieter than a multitasking laptop? Or is this irrelevant in that the GO power supply circuit design will reject/filter noise coming from the computer?

 

In any event, all of the test figures are hugely impressive for such an inexpensive device, I can't wait to receive it.

post #95 of 911
Quote:
Originally Posted by Larry Ho View Post
 

 

This should work!

 

Make sure you do the A/B test by with/without battery. I would love to know the listening results too... 

 

Enjoy!


I have a friend who tried this with a DAC that wasn't even bus powered, and he was astonished at the improvement, so clearly there was noise coming in on the USB power leg in his set-up, the source was a Sony W7 laptop.

 

He was using a semi-expensive battery, the KingRex uPower. I wonder if other more generic USB batteries will not perform as well due to being noisier, maybe due to a cheap regulator?

 

I have a few different USB batteries, they have a choice of 1 amp or 2.1 amp output, which output level is more appropriate for the GO 1000?

 

Does the battery become noisier the more it's charge is depleted?

 

I was disappointed when the Pulse battery power stretch goal was eliminated, is there any thought towards LH offering a unit similar to the uPower but with greater stamina, super regulation, or other features?

post #96 of 911
Quote:
Originally Posted by mikemercer View Post
 

SWEET Jay!!!!

I think Peter is doing some of the best cable work in personal audio today, next to @MoonAudio! Peter's just gotta 

come up with an adapter system like Drews' built.

 

Peter is an adapter god.  Just ask him for what you need and he can build it.  I make my own cables and adapters, and he is my Master Yoda, just without the weird grammar.

post #97 of 911
Quote:
Originally Posted by Larry Ho View Post
 

 

Hi, from the FFT spectrum we saw from Geek Out. The noise floor with BUS power is comfortably lied on -138~-140dB... Use Battery power will help, but you need a very good system to tell the difference... ;-)

 

Does the noise floor measurement capture the impact of jitter due to power line?
I think the battery could still help.


Edited by cat6man - 3/28/14 at 8:49am
post #98 of 911
Thread Starter 

Hey Everybody!

Unfortunately I've got a NASTY cold today - so I'm gonna be horizontal more than vertical, but as soon as I'm clear I'll jump back in here.

Psyched to see the thread getting action!!

 

Here's our review (me and Scot Hull at Part-Time Audiophile) of the Geek Out 1000!

LINK HERE

 

and both of us bought our units (as there were some strange assumptions at the other thread that we didn't have to buy them for review).

I was psyched to see Scot agreed with me on the performance!

 

Also:

I'm not sure if the noise-floor varies from unit to unit - but mine has a nice black background.

I expected a much noisier component - but they sorted that out, post-prototype that we heard at RMAF 2013...

 

post #99 of 911

I have been waiting so long I think you guys are reporting on Unicorns.....

post #100 of 911
Mike, enjoyed the review, would be interested to hear more about the GO 1000 / Alpha Dog pairing as I think this would be an ideal laptop setup for portable use with closed back headphones. Audeze LCD-XC's seem like another great option but a lot more expensive.
post #101 of 911
Quote:
Originally Posted by MikeyFresh View Post
 


Thanks Larry, I have one question regarding the test result vs. actual use with a multitasking computer.

 

Is it safe to say the USB power on the testing equipment is quieter than a multitasking laptop? Or is this irrelevant in that the GO power supply circuit design will reject/filter noise coming from the computer?

 

In any event, all of the test figures are hugely impressive for such an inexpensive device, I can't wait to receive it.

 

Good question: The more devices you plug in on same computer and the same USB bus, the dirtier power and ground will be.

So if you could have a dedicated computer, that will be great.

 

If not, then try to avoid using any thing that will spin! e.g. CD-ROM, Hard Drive etc.... these stuff are super noise generator.

 

Also, I saw someone try to modify the decoupling capacitors on mother board. That should help... But it will need a pair of steady soldering hand... ;-)

post #102 of 911

You got it completely right. In the production version of Geek Out 1000, the noise floor is comfortably at -140dB... So should be 'dark' enough... ;-)

 

Enjoy.

 

Larry

 

Quote:

Originally Posted by mikemercer View Post
 

Hey Everybody!

Unfortunately I've got a NASTY cold today - so I'm gonna be horizontal more than vertical, but as soon as I'm clear I'll jump back in here.

Psyched to see the thread getting action!!

 

Here's our review (me and Scot Hull at Part-Time Audiophile) of the Geek Out 1000!

LINK HERE

 

and both of us bought our units (as there were some strange assumptions at the other thread that we didn't have to buy them for review).

I was psyched to see Scot agreed with me on the performance!

 

Also:

I'm not sure if the noise-floor varies from unit to unit - but mine has a nice black background.

I expected a much noisier component - but they sorted that out, post-prototype that we heard at RMAF 2013...

 

post #103 of 911
Quote:
Originally Posted by Larry Ho View Post

 

Good question: The more devices you plug in on same computer and the same USB bus, the dirtier power and ground will be.

So if you could have a dedicated computer, that will be great.

 

If not, then try to avoid using any thing that will spin! e.g. CD-ROM, Hard Drive etc.... these stuff are super noise generator.

 

Also, I saw someone try to modify the decoupling capacitors on mother board. That should help... But it will need a pair of steady soldering hand... ;-)

 



Good to know, I just have way too much junk plugged into my USB ports unfortunately, wireless keyboard/mouse, portable hard drive, Burson Conductor headphone amp, flash drives and so forth can pretty much always be found coming from my USB ports at all times. What's 1 more dongle?!
post #104 of 911

not sure whether i want to upgrade my hrt microstreamer to the geek out 450 or just save that money for a high-end dap... difficult decision. if i could get the geek out to work with my nexus 5 i suppose i wouldn't really need a dap.

post #105 of 911
Quote:
Originally Posted by raisedbywolves View Post
 

not sure whether i want to upgrade my hrt microstreamer to the geek out 450 or just save that money for a high-end dap... difficult decision. if i could get the geek out to work with my nexus 5 i suppose i wouldn't really need a dap.

I strongly suspect you'll need a OTG cable with a Y splitter and a separate power source.  Assuming it works with OTG...

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