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New Leckerton UHA-6S MKII Portable Headphone Amplifier Announced (Update User Impressions Added... - Page 140

post #2086 of 2097

you have a switch to turn charging ON/OFF. so it's up to you to decide if the leckerton sucks up onto the usb or not when using it as a dac.

post #2087 of 2097
While the switch is there I thought that the mkii always pulls power from USB.
post #2088 of 2097
I'm thrilled to report that this amp is compatible with the new Galaxy S5. I just plugged it in with a USB OTG cable and it works immediately, no changes in settings needed. Huzzah!
post #2089 of 2097
Quote:
Originally Posted by Bazirker View Post

I'm thrilled to report that this amp is compatible with the new Galaxy S5. I just plugged it in with a USB OTG cable and it works immediately, no changes in settings needed. Huzzah!

 

Good news! 

 

Question: is the waterproofing flap on the bottom of the S5 user removable (without breaking the damn thing)?

 

Right now, I'm weighing between the S5, Note 3, HTC M8, and Z1s...and Z2 if it comes to the US ever >.< Being able to remove the flap without damaging the phone would be very helpful.

post #2090 of 2097
Quote:
Originally Posted by AustinValentine View Post

Good news! 

Question: is the waterproofing flap on the bottom of the S5 user removable (without breaking the damn thing)?

Right now, I'm weighing between the S5, Note 3, HTC M8, and Z1s...and Z2 if it comes to the US ever >.< Being able to remove the flap without damaging the phone would be very helpful.

No, you'd have to permanently remove it.
post #2091 of 2097

As the music is blasting in my ears right now, I am thinking this amp design and the capless diymod are a match in heaven.  With both being capless and bridged with my favorite cotton candy LOD cable, the transparency just renders the music flawlessly to these ears.

 

I am at lost and have no clue what else improvement I will need. I have not even done yet recabling my iem's with the cotton candy. This is insane for in-ear music.

post #2092 of 2097
Quote:
Originally Posted by DMinor View Post
 

As the music is blasting in my ears right now, I am thinking this amp design and the capless diymod are a match in heaven.  With both being capless and bridged with my favorite cotton candy LOD cable, the transparency just renders the music flawlessly to these ears.

 

I am at lost and have no clue what else improvement I will need. I have not even done yet recabling my iem's with the cotton candy. This is insane for in-ear music.


I asked Nick about the problem while using capless diymod with this amp, and here's his answer

Quote:
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.

Do you have any problems he mentioned like scratchy volume control or scratchy sound in phone? What phone are you using? What volume/gain setting are you using?

 

I am using pk1 but I think using capless is not complete safe. It should be completely safe with low volume but, as Nick said, the present of DC offset will still have effect on the phone beyond some limit. That's why although I am really interested in sound of capless mod which is, as you said, very transparent, I still plan to use DC blocking caps in LOD with diymod.

 

Thanks.

post #2093 of 2097

Because of the high input impedance of the amp, you can get away with using a very small capacitance caps in the LOD (2~4uF is quite sufficient to reach corner frequency under 10Hz). This opens up the possibility of using small film caps that is usually very transparent (even comparable to capless) while still keeping it as small, as unintrusive and as safe as possible.

post #2094 of 2097
Quote:
Originally Posted by duydangle View Post
 


I asked Nick about the problem while using capless diymod with this amp, and here's his answer

Do you have any problems he mentioned like scratchy volume control or scratchy sound in phone? What phone are you using? What volume/gain setting are you using?

 

I am using pk1 but I think using capless is not complete safe. It should be completely safe with low volume but, as Nick said, the present of DC offset will still have effect on the phone beyond some limit. That's why although I am really interested in sound of capless mod which is, as you said, very transparent, I still plan to use DC blocking caps in LOD with diymod.

 

Thanks.

 

The scratchy sound only occurs when you adjust the volume knob. None issue for me. I have been using the capless diymods for months now, without any problems to the amp or phone (EX1000 and D2000). At low gain, I can max out the vol no problem, at high-gain it may start sound a little distortion at 12. But I don't go that high with my EXK or even D2000. Note the dc offsets from capless diymod are 2 volts, and that number is multiplied by 8 for high-gain setting.

 

The truth is, the capless diymod and the capless UHA yields a very transparent sounding for your music. It's insanely neutral and clean, and music just flows effortlessly and it sounds open and airy. As far as I know, the UHA is the only amp in the market designed without using dc blocking caps but capable of compensating for it.

 

Speaking of diymods, I have probably done comparisons and tried things more than any head-fi'ers. I started with the Elna Silmics 4.7uf (not impressed), then the Wima film 4.7uf caps (good), then the Kemets 4.7uf (very good), .... many more.... then finally some of the 3,000,000 uf caps I have tried sound awesome to my ears. But when I finally decided to try a capless diymod with the UHA, I was instantly surprised by the transparent sounding.

 

I have also done two types of capless diymods for comparison. One is the traditional imod and the other is the direct-out mod (with lod pins lifted off board). Both capless sound awesome but different, and I love both. The capless direct-out mod sounds a little bit more bright and cold.

 

BTW, according to Nick his coming amp-only products will still use similar design concept, i.e. dc blocking caps will not be implemented in the signal path.

post #2095 of 2097
Quote:
Originally Posted by ClieOS View Post
 

Because of the high input impedance of the amp, you can get away with using a very small capacitance caps in the LOD (2~4uF is quite sufficient to reach corner frequency under 10Hz). This opens up the possibility of using small film caps that is usually very transparent (even comparable to capless) while still keeping it as small, as unintrusive and as safe as possible.


That's also my plan. I am planning to use Kemet 2.2uf 50V (Thanks DMinor for the brand) for my LOD. Initially I want to use 4.7uf in my LOD but due to the size I think it will not fit the LOD.

 

@DMinor: Thanks for your interesting information, especially the sound between two diymod methods is different and the scratch sound happens with high gain and 12h, I don't think I will use pk1 that loud :D, and I hope I will not have to.

 

I just use tradition diymod, desolder Z caps and solder cables from them to C65/C84 position wihtout any desoldering. My amp (UHA-6S.MKII with LME49990) still not arrived so I am not yet tested the mod works or not; I am so excited to wait. My caps still not arrived yet, I have to wait for 2 or 3 more weeks (I'm not in the US) to put them in my LOD.

post #2096 of 2097
Quote:
Originally Posted by duydangle View Post
 


 

@DMinor: Thanks for your interesting information, especially the sound between two diymod methods is different and the scratch sound happens with high gain and 12h, I don't think I will use pk1 that loud :D, and I hope I will not have to.

 

 

 

That's not what I said. The scratching sound will be heard on both low and hi gain settings, but it occurs only when you turn the volume knob and it may not be noticed if it's overpowered by music.

 

The 12 o'clock is when you start hearing distortion on hi gain setting only.

post #2097 of 2097
Quote:
Originally Posted by DMinor View Post
 

 

That's not what I said. The scratching sound will be heard on both low and hi gain settings, but it occurs only when you turn the volume knob and it may not be noticed if it's overpowered by music.

 

The 12 o'clock is when you start hearing distortion on hi gain setting only.

Sorry for my English. What you said is what I meant :D.

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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)