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New Leckerton UHA-6S MKII Portable Headphone Amplifier Announced (Update User Impressions Added... - Page 142

post #2116 of 2155
Quote:
Originally Posted by arvore View Post
 

I'm not sure if it's already evening where you live, but this is me reminding you :D and thanks, already, for all the answers you've given!

 

Thanks for the reminder ;). I adjusted the bass valves on the ASG-2 to my preferred level (just barely above fully closed, about a third of the way to the first notch mark) and listened for a couple of minutes to readjust to the sound signature. I adjusted the volume on the DX50 and the gain and volume on the UHA-6S MkII so that I could switch back and forth without having to adjust the volume each time. When listening to the DX50 from the headphone out, I unplugged the lineout to the Leckerton and listened from the HPA on the DX50. When listening to the DX50/UHA-6S combo, I went from lineout of the DX50 into the input on the Leckerton, and then to the headphone out on the UHA-6S. This way, I used the same DAC in both (the DX50's) and changed only the amp. 

 

I went back and forth a few times and took some notes, but the differences were pretty clear: the biggest gains were in the treble, where the sound became more open and significantly more real (cymbals really make this clear for me, for whatever reason) with the Leckerton as the amp. The midrange was less affected than the bass or treble, but there's a noticeable increase in the texture on guitars and the ability to delineate the different sounds at play. Vocals sounded pretty good either way, but on my quick listens, there seemed to be a greater sense of clarity with the Leckerton. As for the bass, the gains were more substantial than I'd remembered. The DX50 HPA seemed to have a greater quantity of bass, but the changes in quality were pretty obvious when moving to the UHA-6S. On the DX50 by itself, bass was pretty woolly, bloated, and poorly defined. Everything just sounded significantly clearer when bringing the Leckerton into the mix. Basslines were much easier to pick out and follow, and there was no bloating or bleeding into the midrange (which wasn't a huge problem with the DX50, but it was definitely there). 

 

So the conclusion is pretty simple: the DX50 + UHA-6S MkII > DX50 solo, in pretty much each region of the spectrum. Now, the provisos: I did this comparison over a few minutes, and switched back and forth quickly, but this was by no means a scientifically thorough examination. (I did a quick attempt at volume matching, but I don't know that I'd be able to give any indication of how accurate it was). I feel comfortable that the results I've reported are accurate for what I heard, but I don't claim that my ears are any better/worse/sexier than anyone else's, so if somebody else has a different finding, more power to ya! Also, please note that the differences were readily apparent only because I was switching back and forth-- when I used the DX50 by itself with the same IEMs before I tried it with the Leckerton, I very much enjoyed the sound, and the issues with the sound were in no way glaring. 

 

Summary: in my opinion, the DX50 is really enjoyable by itself, but is clearly better when the Leckerton is doing the amping. 

 

Hope this helps! :)

post #2117 of 2155
Im still loving my UHA 6S.MKII. It's great with my iMod.

But I was wondering how many are using it as a DAC with thier computers? I havn't had much time to test it with my laptop. Mostly in the past I was using the Icon Nuforce uDAC2 with my notebook. (Clevo X7200). Its a great little DAC/Amp for traveling with. But the UHA may serve both purposes.

Also how would I get the best sound out of the UHA? Would it be through USB digital? Or through the optical input? I also have a Fiio E17 that I may test against the uDAC2 and the UHA. But ultimately I want to know how to get the best possible Audio out of the UHA. And what is the max resolution I can get out of it? Thanks guys!
post #2118 of 2155
Quote:
Originally Posted by DR650SE View Post

Im still loving my UHA 6S.MKII. It's great with my iMod.

But I was wondering how many are using it as a DAC with thier computers? I havn't had much time to test it with my laptop. Mostly in the past I was using the Icon Nuforce uDAC2 with my notebook. (Clevo X7200). Its a great little DAC/Amp for traveling with. But the UHA may serve both purposes.

Also how would I get the best sound out of the UHA? Would it be through USB digital? Or through the optical input? I also have a Fiio E17 that I may test against the uDAC2 and the UHA. But ultimately I want to know how to get the best possible Audio out of the UHA. And what is the max resolution I can get out of it? Thanks guys!


I am using iMod with this amp and I feel that it's being a little weird. I think capless is not very good in my case. When I pair iPod Touch 4 with this amp, or use the built-in DAC connected to computer, the volume control seems to normal. But when I use iMod with Fiio L9 and this amp, the music sounds very different with different volume. I will report my case in farther posts, when I have capped LOD. I am using pk1.

 

About your question about best input, many people reports that you get the best sound to use the built-in DAC with coaxial/optical input. You can get 24bit/96khz sound with coaxial/optical, and 24bit/48khz with usb.

post #2119 of 2155
Awesome, thanks for the info on resolution.

As for the iMod, the reason for that is because with no caps, the amp is having to deal with the DC offset. So at higher volumes it will cut out, and when you adjust the volume there is slight scratching sound. But in the end it is a pure signal as its straght from the DAC to the amp with nothing in between to degrade the signal, giving it a very nuetral and transparent sound.

Here is what was explained to me.

Quote:
Originally Posted by DMinor View Post

Great. I have not heard the E17, so no comparison between the two.

Just FYI, with your capless imod you will have 2 volts of dc offsets to the UHA amp. As a result, you will hear the scratching sound when you turn the vol knob on the UHA. This is normal and you only hear it when you turn the knob. On high gain, the dc offsets are amplified by 8 times and you will hear distortions around 12 o'clock. But I don't need that high vol for my phones so it's a non issue for me.

If you have any questions, you can also email Nick at Leckerton. He is a great guy.

 




Quote:
Originally Posted by DMinor View Post

Great. I have not heard the E17, so no comparison between the two.

Just FYI, with your capless imod you will have 2 volts of dc offsets to the UHA amp. As a result, you will hear the scratching sound when you turn the vol knob on the UHA. This is normal and you only hear it when you turn the knob. On high gain, the dc offsets are amplified by 8 times and you will hear distortions around 12 o'clock. But I don't need that high vol for my phones so it's a non issue for me.

If you have any questions, you can also email Nick at Leckerton. He is a great guy.

 


Edited by DR650SE - 5/20/14 at 9:29am
post #2120 of 2155
Quote:
Originally Posted by Theogenes View Post
 

 

Thanks for the reminder ;). I adjusted the bass valves on the ASG-2 to my preferred level (just barely above fully closed, about a third of the way to the first notch mark) and listened for a couple of minutes to readjust to the sound signature. I adjusted the volume on the DX50 and the gain and volume on the UHA-6S MkII so that I could switch back and forth without having to adjust the volume each time. When listening to the DX50 from the headphone out, I unplugged the lineout to the Leckerton and listened from the HPA on the DX50. When listening to the DX50/UHA-6S combo, I went from lineout of the DX50 into the input on the Leckerton, and then to the headphone out on the UHA-6S. This way, I used the same DAC in both (the DX50's) and changed only the amp. 

 

I went back and forth a few times and took some notes, but the differences were pretty clear: the biggest gains were in the treble, where the sound became more open and significantly more real (cymbals really make this clear for me, for whatever reason) with the Leckerton as the amp. The midrange was less affected than the bass or treble, but there's a noticeable increase in the texture on guitars and the ability to delineate the different sounds at play. Vocals sounded pretty good either way, but on my quick listens, there seemed to be a greater sense of clarity with the Leckerton. As for the bass, the gains were more substantial than I'd remembered. The DX50 HPA seemed to have a greater quantity of bass, but the changes in quality were pretty obvious when moving to the UHA-6S. On the DX50 by itself, bass was pretty woolly, bloated, and poorly defined. Everything just sounded significantly clearer when bringing the Leckerton into the mix. Basslines were much easier to pick out and follow, and there was no bloating or bleeding into the midrange (which wasn't a huge problem with the DX50, but it was definitely there). 

 

So the conclusion is pretty simple: the DX50 + UHA-6S MkII > DX50 solo, in pretty much each region of the spectrum. Now, the provisos: I did this comparison over a few minutes, and switched back and forth quickly, but this was by no means a scientifically thorough examination. (I did a quick attempt at volume matching, but I don't know that I'd be able to give any indication of how accurate it was). I feel comfortable that the results I've reported are accurate for what I heard, but I don't claim that my ears are any better/worse/sexier than anyone else's, so if somebody else has a different finding, more power to ya! Also, please note that the differences were readily apparent only because I was switching back and forth-- when I used the DX50 by itself with the same IEMs before I tried it with the Leckerton, I very much enjoyed the sound, and the issues with the sound were in no way glaring. 

 

Summary: in my opinion, the DX50 is really enjoyable by itself, but is clearly better when the Leckerton is doing the amping. 

 

Hope this helps! :)

Thanks! I'm not sure if it helped or just made me wish more to te able to listen to it ): hahaha!
 

post #2121 of 2155

I wonder how it compares to the DX90? 

post #2122 of 2155
Quote:
Originally Posted by arvore View Post

Thanks! I'm not sure if it helped or just made me wish more to te able to listen to it ): hahaha!

Don't know where you're located, but if there's a Head-Fi meet near you, it might be worth swinging by to check and see if anybody has one you can try out... Nothing beats listening with your own ears, and you might be surprised by what you like-- and what you don't. wink.gif

Quote:
Originally Posted by robm321 View Post

I wonder how it compares to the DX90? 


Don't know, but I'd love to hear some impressions on that m'self! biggrin.gif
post #2123 of 2155
Quote:
Originally Posted by Theogenes View Post


Don't know where you're located, but if there's a Head-Fi meet near you, it might be worth swinging by to check and see if anybody has one you can try out... Nothing beats listening with your own ears, and you might be surprised by what you like-- and what you don't. wink.gif
Don't know, but I'd love to hear some impressions on that m'self! biggrin.gif

I'm located in Brazil. I have never heard of a meeting happening here, neither in the only brazilian audio forum I know. :(

post #2124 of 2155
Quote:
Originally Posted by arvore View Post

I'm located in Brazil. I have never heard of a meeting happening here, neither in the only brazilian audio forum I know. frown.gif

Ah. That does make it a bit more difficult. But hey, look on the bright side: you've got some of the most beautiful women in the UNIVERSE strolling by every day, so that's got to be worth something!!! biggrin.gif
post #2125 of 2155
Btw, it looks like there have been headphone meets in Brazil in the past, at least:

http://www.head-fi.org/t/567579/brazilian-meeting-video

Maybe you could PM the original poster and see if there are some local get-togethers you could attend?
post #2126 of 2155
Quote:
Originally Posted by DR650SE View Post

Awesome, thanks for the info on resolution.

As for the iMod, the reason for that is because with no caps, the amp is having to deal with the DC offset. So at higher volumes it will cut out, and when you adjust the volume there is slight scratching sound. But in the end it is a pure signal as its straght from the DAC to the amp with nothing in between to degrade the signal, giving it a very nuetral and transparent sound.

Here is what was explained to me.
 
Quote:
Originally Posted by DMinor View Post
 

 

Great. I have not heard the E17, so no comparison between the two.

 

Just FYI, with your capless imod you will have 2 volts of dc offsets to the UHA amp. As a result, you will hear the scratching sound when you turn the vol knob on the UHA. This is normal and you only hear it when you turn the knob. On high gain, the dc offsets are amplified by 8 times and you will hear distortions around 12 o'clock. But I don't need that high vol for my phones so it's a non issue for me.

 

If you have any questions, you can also email Nick at Leckerton. He is a great guy.

 



 
Quote:
Originally Posted by DMinor View Post
 

 

Great. I have not heard the E17, so no comparison between the two.

 

Just FYI, with your capless imod you will have 2 volts of dc offsets to the UHA amp. As a result, you will hear the scratching sound when you turn the vol knob on the UHA. This is normal and you only hear it when you turn the knob. On high gain, the dc offsets are amplified by 8 times and you will hear distortions around 12 o'clock. But I don't need that high vol for my phones so it's a non issue for me.

 

If you have any questions, you can also email Nick at Leckerton. He is a great guy.

 


I am sorry I have to correct the information before. The maximum resolution from usb is 16bit/48khz, not 24bit/48khz.

 

Let me explain the weird thing:

 

- With iMod and Fiio L9 (Capless): When the volume is small, it seems only vocal presents. Bigger volume, ambient sound and bass begin to appear. When volume is large, vocal volume seems to be only larger than before a little bit, but ambient sound and bass sounds much bigger. It makes the soundstage is much bigger, but very hard to listen for a long time.

 

- With built-in DAC or iPod Touch 4 + Fiio L9: When volume is changed, the vocal and other sounds volume are changed neutrally and equally.

 

I can easily listen to pk1 with high gain and 10 o' clock setting, but with iMod, more than 9 o' clock high gain is much louder.

 

About the scratchy sound when the volume is changed, I don't hear it. I hear only a small sound when I change gain setting of the amp.

 

One email I have when I asked Nick about DC offset handling of this amp:

 

Quote:
 Hello Duy,
 
That is correct, the amp can handle some DC offset at the input. It has a circuit which automatically compensates for any DC offset at the output, keeping the offset near zero (usually less than 1 mV). Applying 2 volts of DC at the analog input will not harm the amp. It does, however, reduce the maximum voltage swing through the amplifier circuitry, and therefore it will reduce the output power available for some headphones, especially high-impedance headphones. It depends on the volume setting. The higher the volume setting, the higher percentage of DC offset the amplifier input will see, and the more limited output voltage swing you will have. The input impedance is approximately 10k. One thing you may notice with the diymod is that it causes the volume control to become scratchy or noisy. This will not harm the amp, but it could be very loud in your phones.
 
I no longer charge sales tax in Texas, so it would be the cost of the amp plus shipping.
 
Regards,
Nick

 

I think this could the be the possible reason. May be the output power of the amp is affected. I don't know if my assumption is correct.

post #2127 of 2155
Quote:
Originally Posted by robm321 View Post
 

I wonder how it compares to the DX90? 

 

 

Quote:
Originally Posted by Theogenes View Post

Don't know, but I'd love to hear some impressions on that m'self! biggrin.gif

 

 

To put it simply, I am no longer using a stack. As much as I love the UHA-6SMKII paired with DX50, it's services however, is not required with DX90's internal amp alone.

 

Not only the DX90's amp is transparent enough it can supply stable, clean and more power to any headphone load and at max power without clipping compared to UHA-6SMKII. Which we all know is current limited at low impedance loads.

 

I did a quick AB test and can't hear any difference.

post #2128 of 2155

^ Good to know. I'd rather get away from the stack also and use the Leckerton for my laptop only.

post #2129 of 2155

As great as this thing is I just never use a portable setup anymore so the UHA-6S-MKII is up on the marketplace. :(

post #2130 of 2155

Hi guys what do you think of the OPA627AP on the MKII ? . Thanks in advance .

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