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Best Portable Amp I've Heard

A Review On: Leckerton Audio UHA760

Leckerton Audio UHA760

Rated # 62 in Portable Amps
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Review Details:
Audio Quality
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Pros: Balanced Sound, Black Background, Soundstage & Imaging, Build, Features

Cons: Battery Life, DAC Not Up To Scratch, UHA-6S MKII

First I’d like to thanks Nick from Leckerton Audio for the UHA760 loaner unit. I’ve read quite a lot of people praising the UHA-6S.MKII and when I heard that there would be a new model from Leckerton coming out, I was very interested indeed. I have never heard any Leckerton product despite hearing about them because nobody really seems to own them in Australia and I wasn’t quite sure what to expect in terms of sound from the UHA760.



The UHA760 is Leckerton Audio’s new flagship amp/DAC unit and it slots in above the previous and very popular flagship, the UHA-6S.MKII. According to Nick, the amp section is very similar but perhaps slightly improved from the 6S. Seeing as so many people loved the 6S, I thought that this would be a good thing. The impressive UHA760 page also looks very nice and informative. I love the fact that they managed to cram a decent DAC in there along with the amp while keeping the size small enough.


**Disclaimer** The UHA760 is a loaner unit from Nick and I am not offered any special price for doing this review. I was, however, offered the pre order pricing.


Build Quality & Design
Well there is definitely no faulting Leckerton’s build quality; it is exceptional. The UHA760 is priced like a premium product and the build really does show that. The entire unit feels a bit heavy and very solid. The Leckerton logo looks like it wouldn’t be rubbed off easily and the switches all have a very nice click to them. The jacks feel and look rather heavy duty and aren’t very tight to start with. Lastly, the volume knob is not too tight or too easy to spin. Accidentally knocking it won’t result in a huge change of volume.



I am quite a fan of Leckerton’s minimalistic yet thoughtful design. The gain switches are very helpful and I like the UHA760 as well as the power light next to it. The power and charge buttons are at the back, which is thoughtful so they don’t get in the way. Personally, I prefer an on/off switch rather than the volume knob on/off design that some amps use. The charge switch is also useful to prevent the battery from degrading too quickly. I would have liked to a see an option to run purely on USB power, but it’s no big deal. The crossfeed seems to fiddle with the soundstage and makes the sound somewhat thinner. I don’t exactly know what crossfeed is, but I am not a huge fan of it. Still, this feature may appeal to other people. Overall, I think the UHA760 is quite a simple amp, but it has all the features that most people want.



Unboxing & Accessories
When I first got the box, I thought that it was very solid and well-built and it looked rather impressive. However, when I opened the box, I was a bit disappointed with the amount of accessories that I got. There was a USB cable, a manual and some rubber feet. I would have expected them to at least include a 3.5mm cable and some rubber bands at this price, but it’s no big deal. The USB cable is a standard micro USB cable and is very well built. The rubber feet are somewhat solid and not very rubbery. The manual contains some information that you should probably read to ensure that you are not damaging the UHA760, but using it is pretty straightforward.




Measurements & Impedance
Personally, I have never really been a measurements and graphs person. I prefer to actually use my ears to listen. One things that I look for in a portable amp or DAP is the output impedance. For me at least, I prefer the impedance to be as low as possible and it should be under 1 ohm IMO. The UHA760 does pass this with the specs on the website stating it is 0.5 ohms. Anyway, here are the specs from the website for anybody who is interested.



Max output power (1% THD, 1 kHz):

30 mW into 16 ohms

55 mW into 32 ohms

100 mW into 62 ohms

125 mW into 100 ohms

55 mW into 300 ohms

THD+N (1 kHz, USB input, 20 Hz to 22 kHz bandwidth, no weighting):

16 ohms

1 mW: 0.0036%

10 mW: 0.0037%

32 ohms

1 mW: 0.0035%

10 mW: 0.0038%

30 mW: 0.0078%

62 ohms

1 mW: 0.0029%

10 mW: 0.0034%

50 mW: 0.0061%

100 ohms

1 mW: 0.0030%

10 mW: 0.0030%

50 mW: 0.0048%

300 ohms

1 mW: 0.0042%

10 mW: 0.0036%

40 mW: 0.0031%

Frequency response, USB input (48 kHz sample rate)

<3 Hz to 23 kHz, ±1.0 dB

7 Hz to 22 kHz, ±0.1 dB

Frequency response, analogue input

<3 Hz to 75 kHz, ±1.0 dB

7 Hz to 22 kHz, ±0.1 dB

Output impedance (1 kHz): <0.5 ohm

Battery life: (AD8610 op-amp)

12 hours, analogue input

6 hours, USB input

Dimensions: 70 x 84 x 20 mm (2.8 x 3.3 x 0.8 inches)

Weight: 6.0 oz (170 g)



Testing Gear
Well this is a DAC/amp so testing it required switching sources a lot. First I hooked it up to my desktop from foobar2000 and WASAPI. Now, this unfortunately does not have a line out so I cannot use this as a pure DAC so I just compared it as a whole unit to the DX50’s line out feeding the amp. I also used it briefly with the iPod Nano’s line out. Obviously, the better the DAC section, the better the combo will sound. I found the DX50’s DAC section to be the best so for the review, I will be feeding the UHA760 from my DX50. I used my UM Miracles for a while before I sold them, the Dunu DN-1000, Unique Melody 3X, Beyerdynamic DT1350, Sennheiser HD25 I-II, modded Fostex T50RP and finally my HiFiMAN HE-500s. Obviously, the UHA760 didn’t drive the HE-500s well… at all so I will be listening to several IEMs I have on hand right now, specially the Dunu which really responds well to amping.




Sound Quality
Now considering how much praise the UHA6S has received, I was expecting this to sound really good. And it does, but the problem is that it costs $439… certainly not cheap at all. Yes, I do think that it is the best amp for IEMs that I have heard and from memory I think it is better than the Matrix Portable. Another thing that I am not quite sure what section to put in is the background noise in this. It is silent, completely silent. This is simply the most silent amp that I have heard and I feel like this is one of its big selling points. Anyway, on with the review.


DAC Section
Now, Leckerton’s marketing for this amp is very much targeted at the new DAC in the UHA760. I have followed Wolfson and Sabre DAC chips for a while, but I haven’t really paid attention to Cirrus Logic chip. This uses the flagship Cirrus DAC, the CS4398. Personally, I think that the DAC is a nice touch and certainly a nice upgrade over the DACs in laptops and desktops, but it isn’t that great. I think that it is rather neutral and similar to the DX50’s DAC, but it is perhaps a little bright. It is quite detailed, but just falls behind the DX50’s DAC in a lot of ways. Flysweep also noted that the DAC section of the UHA760 wasn’t a huge upgrade over the UHA6S one. So to sum up, the UHA760’s DAC is good, but not great.


Overall, I feel like the entire amp is rather neutral sounding and this applies to the bass as well. When I first heard the UHA760, I thought that the bass might has been just a little bit on the heavy side but after a bit more listening, I found that the bass was actually very full sounding, but perfectly neutral. It hits as hard as it should and there is no boosted, warm Fiio bass at all. It is very fast and the bass is the most detailed that I have heard from any portable amp I’ve tried. From memory, I really liked the Tralucent T1’s bass, and that gets close, but isn’t quite up with the UHA760. Drums have that perfect amount of reverb and bass guitars are very well reproduced. All in all, I think that the bass is awesome and there is nothing that I have heard that can compete with this.


I think that burn in has changed this area the most of all. Previously, when I first received this, the midrange was rather warm and I would even call it a bit congested. Vocals would sound a bit too muddy and even the DN-1000 lost that sharpness in the midrange. However, after around 100 hours, I feel like the midrange has improved significantly, but I still feel like there is a very slight warmth in the midrange, which I am not particularly fond of. Vocals now do sound great and it pairs really nicely with the DN-1000’s colder midrange. Vocals are detailed and I really love Maroon 5 from the UHA760. The piano also has a very realistic timbre and weight to it which I do not get from the DX50 – Palaios. The midrange is a bit smooth, but definitely very detailed.


The treble for me was just about perfectly flat, but remember, neutrality is a very subjective term. My perceived neutrality does not necessarily mean that you will hear it as neutral as well. When I first got it, I did think that it was somewhat rolled off and it has improved with burn in. Whilst I am confident that the midrange improvement was because of actually burn in, I’m not sure if the treble becoming brighter is in my head or real. Anyway, I think that the treble is perhaps the “weaker” area of the UHA760. It is certainly detailed and has a nice and realistic sparkle, but I feel like it just feels a little bit congested up there at the top. This was present from the start but it has gotten a little better I think. Cymbal still have a nice decay and sparkle to them, but on complex passages involving a lot of treble, I feel like the UHA760 just becomes a bit muddy.



Separation & Detail
The separation is truly impressive for something of its size. It is the only amp that can match my O2 in terms of separation, which is a huge feat. Although the DX50 does very well on simple and complicated tracks, adding the UHA760 really did make the separation go up a notch. This was much more evident is complicated tracks where the DX50’s amp section started to struggle a little.


To me at least, the UHA760 is a neutral amp that may just have a hint of warmth and I feel like this gives an impression of not being particularly detailed. However, it is really quite detailed, as good as the O2 and better than any other portable amp I’ve heard except the Matrix portable amp (take this with a grain of salt because this is from memory) which is very impressive.



Soundstage & Imaging
Soundstage is definitely one of the UHA760’s strong suits. It is wide and very well defined. The DX50’s soundstage is arguably a little weak and the UHA760 does make everything sound much more spacious. It does give me a much better sense of depth and height, which is not really something I hear in many amps. The soundstage is definitely great on the UHA760.


Imaging is again, impressive on the UHA760. It is very accurate and realistic, very well separated. This does even better than the O2 which I find to be very impressive considering the UHA760’s size. I feel like compared to the Palaios, the UHA760 is a pretty solid upgrade in this area. The imaging of the UHA760 is wonderful and it’s definitely one of the best I’ve heard from a portable amp.



Ah, here is where I feel a little let down by the UHA760. For some reason, I feel like this is a little bit on the smooth side and its clarity is not as good as other amps I’ve heard. Vocals sound a tad but smoothed out and not as clear as the O2 or the T1 (again, from memory, so take this with a grain of salt). This may be some people’s preference though, but personally I would have liked to see the clarity be a bit better.



The UHA-760 is rather neutral and has no obvious colourations such as a boosted bass or a spiky treble. However, I feel like, as I have mentioned before, it is a little bit on the warm/smooth side. Now, they aren’t as warm as the Fiio products I’ve heard for sure, but it is a little warm. I actually prefer my sources to be neutral to a little bright and I can’t say I really like the UHA760’s tonality. However, it doesn’t detract from my listening experience at all (except for the slightly weak clarity).





Don’t take one look at the 3 and a half star rating and straight away think that this amp is no good, because that is definitely not the case at all. The UHA760 is a very competent portable amp with a nice inbuilt DAC, but the average rating is because of its younger brother, the UHA-6S MKII. I’ve heard it has an almost identical amp section (I have not actually heard the 6S myself though) and it also has a DAC with optical and coaxial in which some people may want. Now, the 6S is priced at $279, a good $160 less than the 760. So what you are essentially paying extra for is the DAC, which is IMO nothing special. I think that you’d be a lot better off going for the UHA-6S MKII and put the rest to a nice DAC or DAP. 


Most of the pictures are not mine. If you have any objections with me using your picture(s). let me know and I will take it down. 


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