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New Leckerton UHA-6S MKII Portable Headphone Amplifier Announced (Update User Impressions Added... - Page 139

post #2071 of 2193

Yeah, I saw Nick's blog regarding the move to Portland, OR of all places.  Hopefully, it'll give me chance to audition some of his latest creations when I visit family down there. You know, he'll be very close to Ken Ball from ALO Audio.  :evil: 

post #2072 of 2193

His amp is superior, also his services. That capless design concept is just awesome and confirms why I enjoy so much listening to my music.

 

I am glad he is considering making dedicated amp only without DAC section. That simplicity will likely enable him to improve the amp section. Can't wait to try one with the amp section only.

post #2073 of 2193

I did a lot of comparisons between different portable amps, UHA-6S, UHA-4, PHA-1, O2, C5D and hifi-M8. I sold PHA-1 and C5D which I found no specific advantage/strength over the other amps I have.

 

O2 is really a good reference amp which UHA-6S can easily match. I am keeping hifi-m8 because of it's output power. THe UHA-4 being so slim but I might sell soon as well.

 

In short I am using the UHA-6SMKII the most. Although it can drive my T1 fairly well, I would still like to see Nick offering an amp only portable amp maybe slimmer but as powerful as M8 so I can only have 1 amp for both ciems and cans.

post #2074 of 2193
Quote:
Originally Posted by headwhacker View Post
 

I did a lot of comparisons between different portable amps, UHA-6S, UHA-4, PHA-1, O2, C5D and hifi-M8. I sold PHA-1 and C5D which I found no specific advantage/strength over the other amps I have.

 

O2 is really a good reference amp which UHA-6S can easily match. I am keeping hifi-m8 because of it's output power. THe UHA-4 being so slim but I might sell soon as well.

 

In short I am using the UHA-6SMKII the most. Although it can drive my T1 fairly well, I would still like to see Nick offering an amp only portable amp maybe slimmer but as powerful as M8 so I can only have 1 amp for both ciems and cans.

 

The circuit design for the UHA-4 is different. According to Nick, the digital volume chip in the UHA-4 operates at a DC offset which requires DC-blocking caps in order to interface with the rest of the circuitry.

post #2075 of 2193

What is the best opamp that Nick currently offers for the mkii in terms of reference sound and clarity?

post #2076 of 2193
Quote:
Originally Posted by Poimandres View Post

What is the best opamp that Nick currently offers for the mkii in terms of reference sound and clarity?

Stock 8610.
post #2077 of 2193

Anyone else?  How about the OPA209aid or some of the other new ones?

post #2078 of 2193

The UHA-6SMKII with AD797ANZ continues to amaze me. This time using my Beyerdynamic T1. It appears to drive the T1 now with better control and separation. It also seems to have enhanced the details from low end up to the high end. I guess the higher current output of AD797 helps in this setup.

 

However, I need to plug the UHA-6SMKII to a powersource or the overall sound is noticeably thinner and the bass impact weaker on battery power only.

post #2079 of 2193
Quote:
Originally Posted by headwhacker View Post
 

The UHA-6SMKII with AD797ANZ continues to amaze me. This time using my Beyerdynamic T1. It appears to drive the T1 now with better control and separation. It also seems to have enhanced the details from low end up to the high end. I guess the higher current output of AD797 helps in this setup.

 

However, I need to plug the UHA-6SMKII to a powersource or the overall sound is noticeably thinner and the bass impact weaker on battery power only.

 

I hope this is just because your headphone is 600 ohms. I heard Nick only recommend this amp for <= 300 ohm headphone.

post #2080 of 2193
Quote:
Originally Posted by duydangle View Post

I hope this is just because your headphone is 600 ohms. I heard Nick only recommend this amp for <= 300 ohm headphone.

yeah but T1 at 600 ohms is efficient with 102dB/mW sensitivity. I am comparing it with my hifi-m8 which can put out as much as 1000mW but I don't hear much difference with UHA-6S. Since I put AD797 it appers to have driven T1 with better control and tight dynamic bass. this without affecting mid/treble details and no hint of clipping/distortion.

Volume pot mostly at 12 oclock and at high gain
post #2081 of 2193

From a recent email exchange with Nick, he has confirmed some amp-only products are in the pipeline, with similarities to the UHA-6S MKII amp stage including no use of DC blocking caps. I am really looking forward to his new offerings. With the UHA-6S sounding this damn good, I don't know what else to expect honestly.

 

There is no one else so far except Nick who has the guts with confidence to tell me to feed that amazing amp with 1.5 volts of DC offsets, especially when the amp has been designed cap-free for DC blocking. Ever since that moment I plugged it in, I have been addicted to that transparent sounding.

post #2082 of 2193
more power would be nice and if possible make it thinner. Removing the circuit for DAC should allow him some headroom to add more power or making UHA-6SMKII slimmer. But yeah I agree transparency is the way to go.
post #2083 of 2193

Hi,

 

Can this be used with a USB hub? Specifically, a non-powered usb hub.

 

My tablet has only one usb port and there are times I need more than one usb device connected.

 

Thanks

post #2084 of 2193
Quote:
Originally Posted by kimck99 View Post
 

Hi,

 

Can this be used with a USB hub? Specifically, a non-powered usb hub.

 

My tablet has only one usb port and there are times I need more than one usb device connected.

 

Thanks

 

Yes, although you may need to run it on battery and charge it separately depending on the power demands through the USB hub.  I don't have any trouble charging through my hub!

post #2085 of 2193
Quote:
Originally Posted by Bazirker View Post
 

 

Yes, although you may need to run it on battery and charge it separately depending on the power demands through the USB hub.  I don't have any trouble charging through my hub!

 

Yes, I assumed you would have to run it on battery. Thanks.

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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)