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New Leckerton UHA-6S MKII Portable Headphone Amplifier Announced (Update User Impressions Added... - Page 136

post #2026 of 2165
Quote:
Originally Posted by headwhacker View Post


Channel imbalance is only noticeable if the analogue pot is set at the lower ranges from 7 o'clock to 9/10 o'clock positions. Past 10 o'clock it's not an issue anymore. While true a digital pot is superior to an analog pot across the full range, modifying the low gain to -12dB on 6SMKII makes it a non issue on sensitive iems.

 

Mine is only noticeable at 7 or below with my EX1000. Never been an issue and never even thought about it.

post #2027 of 2165
Quote:
Originally Posted by DMinor View Post
 

 

Mine is only noticeable at 7 or below with my EX1000. Never been an issue and never even thought about it.

 

Exactly my point. I am just talking generally speaking about an analog pot. Some are definitely better than others. For me digital pot is nice to have but not a necessity. Especially if you have an option to adjust the gain of the amp as a workaround.

 

I am actually more concerned with the limited range the volume pot can travel at the default gain settings. I am planning to get a second 6SMKII and have it modified to reduce the gain instead of going for 760.

post #2028 of 2165
Quote:
Originally Posted by headwhacker View Post

You do realize that is entirely my opinion if I choose between 6SMKII and 760. What's derogative about "useless" that is exactly how I see it. 

 

Of course. Hence my statement: "You are, of course, fully entitled to your opinion."

 

Quote:
Originally Posted by headwhacker View Post

You may agree or not but you have to state your reason why.

 

I don't have any issue with the substance of your comments, merely the way they were presented, which seemed a bit dramatic and antagonistic to me without much in the way of provocation. At any rate, your thoughts and feelings are your own, and we'll leave the matter at a point of respect for that and move on. 

 

Pulling back to the more general concept of 'things that might be improved upon in future iterations,' I would still say the DAC is the area where improvement could be the most impactful. It's not terrible (the impression I got on reading some of the posts much earlier in the thread), but it isn't up to the snuff of many other devices on the market today. I realize Nick is somewhat limited in what he can use by his employer (politically, not physically or actually), but I wonder if there aren't other chips or different implementations that might allow for improvements. I have no technical knowledge of such matters personally, but I'm curious. 

 

Someone earlier on characterized the 6S2 as essentially a truly excellent portable amp with a convenience-level DAC thrown in as a value-add feature. Thus far, I've found that to be spot-on... Mr. Leckerton's amp is really pretty remarkable IMO. Still can't believe what a dramatic improvement it is over the amp section in the DX50, which I found acceptable if not exceptional. 

 

It would be interesting to see what Nick could do with a full-sized desktop amp... And while I'm dreaming aloud, why not a balanced amp, at that? ;)

post #2029 of 2165
Quote:
Originally Posted by Theogenes View Post
 

 

Of course. Hence my statement: "You are, of course, fully entitled to your opinion."

 

 

I don't have any issue with the substance of your comments, merely the way they were presented, which seemed a bit dramatic and antagonistic to me without much in the way of provocation. At any rate, your thoughts and feelings are your own, and we'll leave the matter at a point of respect for that and move on. 

 

Pulling back to the more general concept of 'things that might be improved upon in future iterations,' I would still say the DAC is the area where improvement could be the most impactful. It's not terrible (the impression I got on reading some of the posts much earlier in the thread), but it isn't up to the snuff of many other devices on the market today. I realize Nick is somewhat limited in what he can use by his employer (politically, not physically or actually), but I wonder if there aren't other chips or different implementations that might allow for improvements. I have no technical knowledge of such matters personally, but I'm curious. 

 

Someone earlier on characterized the 6S2 as essentially a truly excellent portable amp with a convenience-level DAC thrown in as a value-add feature. Thus far, I've found that to be spot-on... Mr. Leckerton's amp is really pretty remarkable IMO. Still can't believe what a dramatic improvement it is over the amp section in the DX50, which I found acceptable if not exceptional. 

 

It would be interesting to see what Nick could do with a full-sized desktop amp... And while I'm dreaming aloud, why not a balanced amp, at that? ;)

 

I agree the DAC while not bad is not great either. I can enjoy the sound the CL chip puts out but not as much I enjoy the DAC in DX50.

 

If I were Nick I'll ditch the DAC, trim the width a bit (5 -10mm) and make them thinner. Perhaps make it longer so it matches the dimensions of most DAPs out there. Then use that space to make a more powerful amp so it can be a truly compact, versatile, transparent and powerful amp.

 

There is no point of adding a DAC when DAPs nowadays including the soon to be released DAPs have an excellent DAC. Unless you can pull off something at the level of hifi-m8 or Hugo even. But then it will be very expensive and would require much more resource on Leckerton's part.

 

Concentrate on the amp but on a small package and throw in all the features he can fit inside the case.

 

Don't you wish the UHA-6SMKII could fit into the size of the Headstage arrow.

post #2030 of 2165
The amp isn't just used in conjunction with daps, it's also widely used with computers, in which a built in dac is highly convenient.

The CS4398, in the 6s and 760, is a 'flagship' chip and is the exact same chip that's in the $3,000 AK240 (well dual CS4398). Of course there's different methods of implementation and usb receivers used. The simple point being it can be a supposed high end dac as well a decent throw in.

I found the upsampling implementation in the 760 to be an upgrade to the non-upsampling 6s version. However the jury seems to still be out whether the digital volume control is changing the SQ from the amp section, since it is supposedly the same.

All that being said, I'd be interested in the 6s amp section only, in an even smaller case with analog volume. I don't really care for the arrow form factor, so something more along the lines if the pico slim would appeal to me.
Edited by shotgunshane - 3/6/14 at 6:44am
post #2031 of 2165
Quote:
Originally Posted by shotgunshane View Post

The amp isn't just used in conjunction with daps, it's also widely used with computers, in which a built in dac is highly convenient.

The CS4398, in the 6s and 760, is a 'flagship' chip and is the exact same chip that's in the $3,000 AK240 (well dual CS4398). Of course there's different methods of implementation and usb receivers used. The simple point being it can be a supposed high end dac as well a decent throw in.

I found the upsampling implantation in the 760 to be an upgrade to the non-upsampling 6s version. However the jury seems to still be out whether the digital volume control is changing the SQ from the amp section, since it is supposedly the same.

All that being said, I'd be interested in the 6s amp section only, in an even smaller case with analog volume. I don't really care for the arrow form factor, so something more along the lines if the pico slim would appeal to me.

 

USB DAC function is becoming a main feature in the new DAPs. You will most likely spend time listening to a DAP than your computer. At the most portable setup you would like to take your DAP with an iem only. But if you like to use a full size headphone just slap an amp for the extra power required. He can still sell UHA-6SMKII and perhaps improve it's DAC section. But the 760 could have offerred more than what it current has.

post #2032 of 2165

I agree with the gain thing, a well picked gain plays a big part in me using an amp or not with IEMs, and it could remove the drawbacks of the analog volume control of the UHA-6S mkII.(I still feel the knob to be too big and too easy to turn by mistake in my pocket, something the UHA-760 have solved for me).

anyway it's not like Nick removed the 6 for the 760, we can all pick the one we think is best for us knowing the amp section is pretty much the same.

post #2033 of 2165

Simplicity is the beauty. For dap I just want a simple and clean/true lineout. For amp I would like to have just the amp section no dac no other things. When you put too many things in one space especially limited space you will compromise something either due to the limited space or interference between each other.

 

Keeping the signal path simple and clean is the only way to maximize transparency. With transparency you are golden.

post #2034 of 2165
Quote:
Originally Posted by castleofargh View Post

I agree with the gain thing, a well picked gain plays a big part in me using an amp or not with IEMs, and it could remove the drawbacks of the analog volume control of the UHA-6S mkII.(I still feel the knob to be too big and too easy to turn by mistake in my pocket, something the UHA-760 have solved for me).
anyway it's not like Nick removed the 6 for the 760, we can all pick the one we think is best for us knowing the amp section is pretty much the same.

I have found the gain to be useful sometimes with my Sennheiser HD600s.

The 6S2 is very versatile because in addition to its DAC being input via Coaxial, Optical, USB, it can also be fed digital out from an IPhone 5 running IOS7, plus of course the LO into its Amp.

And you can change its sound by changing the OPamps.

It really is a good piece of kit.
post #2035 of 2165

An amp only might be interesting, especially if it allowed for a significantly smaller size as SGS and Headwhacker mentioned. I'd probably just keep my 6S2 unless the amp was significantly better, though, as I can take it to work and plug it into the computer there if need be and use the USB DAC for non-critical listening. 

 

It would be interesting to see what Nick could do with a full-sized amp, though... Considering how good this one is. Reminds me of Jan Meier and his PCSTEP, another great portable amp that, by all accounts, has an even better full-sized counterpart. 

post #2036 of 2165

I think from reading his blog he is planning on following up on 760 which will support 24/192 on USB. He mentioned that it will require a bigger case. who knows he might be cooking something up that will surprise us.

post #2037 of 2165

I was about to purchase the 760, but now I'm waiting for its succesor; Longer battery life is essential for me.

post #2038 of 2165
Quote:
Originally Posted by zolom View Post
 

I was about to purchase the 760, but now I'm waiting for its succesor; Longer battery life is essential for me.

 

Are you going to use it for DAC/Amp? If you only need the amp section, the 6S-MKII can last for more than 20 hours.

post #2039 of 2165

Yeah the 6S battery is decent, and I like the USB charging as I sit everyday in front of my computer in the office. I have not opened the amp yet to take a look at the battery, but hopefully I can replace it myself in the future if needed.

 

Guys please let me know if there are any other amps designed similarly as the 6S using no caps yet capable of compensating for some dc offsets. I am just curious. I asked the vendor for Vorzüge VorzAMP PURE II, and I was told not to use it with my capless diymod even that amp has implemented dc blocking caps. Forget it now after I sampled the transparency. Nick is probably the only guy who has the guts to tell me to do it. Alo sucks and simply ignored my repeated questions about this topic, even I am one of their customers.

post #2040 of 2165
Quote:
Originally Posted by headwhacker View Post
 

 

Are you going to use it for DAC/Amp? If you only need the amp section, the 6S-MKII can last for more than 20 hours.

I intend to use it mostly as a DAC/AMP

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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)