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New Leckerton UHA-6S MKII Portable Headphone Amplifier Announced (Update User Impressions Added... - Page 101

post #1501 of 2184
Quote:
Originally Posted by supra1988t View Post

Well I've had my UHA-6 MKII for a few weeks but haven't given it much serious listening time.  I got a mini to mini OTG cable and finally got around to using the Leckerton with my GS3 today and the UHA-6 picks up tons of interference.  Its ok when just music is playing but if i use the phone for anything else (which I usually do) it is unbearable.  I am surprised I haven't heard of this issue if its common.  Anyone else have this problem? :(

Which Op-Amp is in yours? It would seem that the OPA209 particularly can pick up interference.

 

http://www.leckertonaudio.com/2012/11/choosing-output-op-amps/

post #1502 of 2184
Would it be entirely the Leckerton's fault if the interference only happens when he's using the phone tho? I guess it makes sense that when the phone's air interface is idle then the Leckerton wouldn't pick up anything...

Does it also happen if you're doing something on the phone that doesn't involve 3G/4G/wifi? You could try isolating the two somehow (might need a micro USB extension) and then putting a second phone close to the Leckerton to confirm whether it's the latter picking up air noise or something else going on with your phone.

Is that the EU Exynos SGS3 btw or the US S4/Krait SGS3? GSM (EU/AT&T/T-Mobile) or CDMA (VZW/Sprint)? Makes a difference...
Edited by Impulse - 4/9/13 at 2:02am
post #1503 of 2184
Quote:
Originally Posted by supra1988t View Post

Well I've had my UHA-6 MKII for a few weeks but haven't given it much serious listening time.  I got a mini to mini OTG cable and finally got around to using the Leckerton with my GS3 today and the UHA-6 picks up tons of interference.  Its ok when just music is playing but if i use the phone for anything else (which I usually do) it is unbearable.  I am surprised I haven't heard of this issue if its common.  Anyone else have this problem? :(

 

The 209 and 627 pick up transmissions as noise (it's not bad on the 627, but it can't be ignored). I've never had interference problems with the 8610. I suspect this is part of why Nick changed from the 209 back to the 8610 as the stock op-amp in the MkII.

 

I don't use my mobile phone as a source because I need it for other things; but usually having it within a half-meter or less of the amp is sufficient to pick up something.

 

If you were to, say, run a long-ish interconnect between phone and amp, and position them on opposite sides of your keyboard, the noise would likely go away, or at least diminish a lot.

post #1504 of 2184
Quote:
Originally Posted by ardgedee View Post

 

The 209 and 627 pick up transmissions as noise (it's not bad on the 627, but it can't be ignored). I've never had interference problems with the 8610. I suspect this is part of why Nick changed from the 209 back to the 8610 as the stock op-amp in the MkII.

 

I don't use my mobile phone as a source because I need it for other things; but usually having it within a half-meter or less of the amp is sufficient to pick up something.

 

If you were to, say, run a long-ish interconnect between phone and amp, and position them on opposite sides of your keyboard, the noise would likely go away, or at least diminish a lot.


Where can I read comparisons between the OPA290 and AD8610? I've been thinking switching from OPA209 to AD8610 but I'm worried that there will be a degrade in sound quality.

post #1505 of 2184
Quote:
Originally Posted by robm321 View Post

I just wish someone would come out with a portable and practical DAP with digital out. 

The headphone jack on the AK100 doubles as a TosLink output. The issue is getting a connection. There is a company in Canada, Sysconcept, that does custom optical cables for portable applications, or you can cobble something together using a short cable and a couple of 90 degree adapters.
post #1506 of 2184
$700 doesn't pass my "practical" criteria, but thanks for the suggestion smily_headphones1.gif
post #1507 of 2184

foe how long should i charge it? once the power is done for it.

post #1508 of 2184
Quote:
Originally Posted by ardgedee View Post

 

The 209 and 627 pick up transmissions as noise (it's not bad on the 627, but it can't be ignored). I've never had interference problems with the 8610. I suspect this is part of why Nick changed from the 209 back to the 8610 as the stock op-amp in the MkII.

 

I don't use my mobile phone as a source because I need it for other things; but usually having it within a half-meter or less of the amp is sufficient to pick up something.

 

If you were to, say, run a long-ish interconnect between phone and amp, and position them on opposite sides of your keyboard, the noise would likely go away, or at least diminish a lot.


Thanks guys, I do have the 209.  Looks like I'll have to pick up an 8610.

post #1509 of 2184
Quote:
Originally Posted by Shini44 View Post

foe how long should i charge it? once the power is done for it.

 

The light on the back will turn green when it's fully charged (if you're asking about the UHA-6S.MKII).

post #1510 of 2184
Quote:
Originally Posted by supra1988t View Post

Well I've had my UHA-6 MKII for a few weeks but haven't given it much serious listening time.  I got a mini to mini OTG cable and finally got around to using the Leckerton with my GS3 today and the UHA-6 picks up tons of interference.  Its ok when just music is playing but if i use the phone for anything else (which I usually do) it is unbearable.  I am surprised I haven't heard of this issue if its common.  Anyone else have this problem? :(

 

I don't have the Leckerton yet, but I have several other portable units (iBasso D-Zero, iBasso D6, ODAC/O2, Meier PCSTEP, Apex Glacier) and they ALL have interference issues with cellphones (I'm using a Verizon 4GLTE device). It seems like turning off Bluetooth helps, but it's still there. When I listen while driving long distances (as I did yesterday), I use a retractable USB cable to separate the phone and amp as much as possible, which also helps. 

 

It seems like this might be at least helped by putting some type of shielding between the phone and the DAC/amp. Has anybody tried this? 

 

EDIT: this is a company that produces a number of different types of EMI/RFI shielding, and since they allow you to register for free samples, I've signed up and will hopefully be able to test some of these out. The frequencies Verizon uses at the moment are 700/850/1900 MHz, so we'll see if this helps the interference or diminishes reception. Anybody with helpful information here would be appreciated! :)

post #1511 of 2184
Quote:
Originally Posted by Defiant00 View Post

 

The light on the back will turn green when it's fully charged (if you're asking about the UHA-6S.MKII).

forgot to mention that i got color blind or what so ever does they call it :P

post #1512 of 2184
If you place a shield around the phone and it reduces interference picked up by the amp them it's obviously gonna impact reception on the phone, and that will drain your battery faster than even using the phone... 'Course you can just shield the amp instead. tongue.gif Pretty sure I've seen pics of someone that applied shielding to the inside of their Leckerton, might've been on one of the older models.
Edited by Impulse - 4/11/13 at 4:58pm
post #1513 of 2184
Quote:
Originally Posted by Theogenes View Post

I don't have the Leckerton yet, but I have several other portable units (iBasso D-Zero, iBasso D6, ODAC/O2, Meier PCSTEP, Apex Glacier) and they ALL have interference issues with cellphones (I'm using a Verizon 4GLTE device). It seems like turning off Bluetooth helps, but it's still there. When I listen while driving long distances (as I did yesterday), I use a retractable USB cable to separate the phone and amp as much as possible, which also helps. 

It seems like this might be at least helped by putting some type of shielding between the phone and the DAC/amp. Has anybody tried this? 

EDIT: this is a company that produces a number of different types of EMI/RFI shielding, and since they allow you to register for free samples, I've signed up and will hopefully be able to test some of these out. The frequencies Verizon uses at the moment are 700/850/1900 MHz, so we'll see if this helps the interference or diminishes reception. Anybody with helpful information here would be appreciated! smily_headphones1.gif

I've never had this issue on my ibasso D10. I'm sure a different opamp will fix it though.
post #1514 of 2184
Quote:
Originally Posted by supra1988t View Post

I've never had this issue on my ibasso D10. I'm sure a different opamp will fix it though.

 

Really? I've had experiences that were better and worse, but none that had no interference from the cellphone. I still don't have the Leckerton yet (insert vile expletives here), but I'm still curious about your setup. I'm assuming you're using the 8610 opamp? And what mobile device, if you don't mind my asking? 

post #1515 of 2184
It depends on so many more things than the amp you know... My old AT&T phone(s) seemed to elicit this a lot more than my current Sprint one. The carriers don't even use the same data frequencies across the whole country. Lots of variables at play, I'm sure even distance from the cell site can have an impact (which can alter how hard the phone works at holding a signal, transmit power etc).
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Head-Fi.org › Forums › Equipment Forums › Portable Headphone Amps › New Leckerton UHA-6S MKII Portable Headphone Amplifier Announced (Update User Impressions Added July 20th 2012)